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Home » Qapass 1602A Lcd Arduino | Introduction: Lcd 1602 With Arduino Uno R3

Qapass 1602A Lcd Arduino | Introduction: Lcd 1602 With Arduino Uno R3

How to Use I2C LCD with Arduino | Very Easy Arduino LCD I2C Tutorial | Arduino 16x2 LCD I2C Tutorial

Schematic

Hello World Example

This example sketch prints

to the LCD and shows the time in seconds since the Arduino was reset.

Hello World!

1/*2 LiquidCrystal Library – Hello World34 Demonstrates the use a 16×2 LCD display. The LiquidCrystal5 library works with all LCD displays that are compatible with the6 Hitachi HD44780 driver. There are many of them out there, and you7 can usually tell them by the 16-pin interface.89 This sketch prints “Hello World!” to the LCD10 and shows the time.1112 The circuit:13 * LCD RS pin to digital pin 1214 * LCD Enable pin to digital pin 1115 * LCD D4 pin to digital pin 516 * LCD D5 pin to digital pin 417 * LCD D6 pin to digital pin 318 * LCD D7 pin to digital pin 219 * LCD R/W pin to ground20 * LCD VSS pin to ground21 * LCD VCC pin to 5V22 * 10K resistor:23 * ends to +5V and ground24 * wiper to LCD VO pin (pin 3)2526 Library originally added 18 Apr 200827 by David A. Mellis28 library modified 5 Jul 200929 by Limor Fried (http://www.ladyada.net)30 example added 9 Jul 200931 by Tom Igoe32 modified 22 Nov 201033 by Tom Igoe34 modified 7 Nov 201635 by Arturo Guadalupi3637 This example code is in the public domain.3839 https://docs.arduino.cc/learn/electronics/lcd-displays4041*/4243// include the library code:44#include 4546// initialize the library by associating any needed LCD interface pin47// with the arduino pin number it is connected to48const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;49LiquidCrystal lcd(rs, en, d4, d5, d6, d7);5051void setup() {52 // set up the LCD’s number of columns and rows:53 lcd.begin(16, 2);54 // Print a message to the LCD.55 lcd.print(“hello, world!”);56}5758void loop() {59 // set the cursor to column 0, line 160 // (note: line 1 is the second row, since counting begins with 0):61 lcd.setCursor(0, 1);62 // print the number of seconds since reset:63 lcd.print(millis() / 1000);64}

Autoscroll Example

This example sketch shows how to use the

and

autoscroll()

methods to move all the text on the display left or right.

noAutoscroll()

  • moves all the text one space to the left each time a letter is added


    autoscroll()

  • turns scrolling off


    noAutoscroll()

This sketch prints the characters

to

with autoscroll off, then moves the cursor to the bottom right, turns autoscroll on, and prints them again.

1/*23 LiquidCrystal Library – Autoscroll45 Demonstrates the use a 16×2 LCD display. The LiquidCrystal67 library works with all LCD displays that are compatible with the89 Hitachi HD44780 driver. There are many of them out there, and you1011 can usually tell them by the 16-pin interface.1213 This sketch demonstrates the use of the autoscroll()1415 and noAutoscroll() functions to make new text scroll or not.1617 The circuit:1819 * LCD RS pin to digital pin 122021 * LCD Enable pin to digital pin 112223 * LCD D4 pin to digital pin 52425 * LCD D5 pin to digital pin 42627 * LCD D6 pin to digital pin 32829 * LCD D7 pin to digital pin 23031 * LCD R/W pin to ground3233 * 10K resistor:3435 * ends to +5V and ground3637 * wiper to LCD VO pin (pin 3)3839 Library originally added 18 Apr 20084041 by David A. Mellis4243 library modified 5 Jul 20094445 by Limor Fried (http://www.ladyada.net)4647 example added 9 Jul 20094849 by Tom Igoe5051 modified 22 Nov 20105253 by Tom Igoe5455 modified 7 Nov 20165657 by Arturo Guadalupi5859 This example code is in the public domain.6061 http://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll6263*/6465// include the library code:66#include 6768// initialize the library by associating any needed LCD interface pin69// with the arduino pin number it is connected to7071const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;7273LiquidCrystal lcd(rs, en, d4, d5, d6, d7);7475void setup() {7677 // set up the LCD’s number of columns and rows:7879 lcd.begin(16, 2);80}8182void loop() {8384 // set the cursor to (0,0):8586 lcd.setCursor(0, 0);8788 // print from 0 to 9:8990 for (int thisChar = 0; thisChar < 10; thisChar++) {9192 lcd.print(thisChar);9394 delay(500);9596 }9798 // set the cursor to (16,1):99100 lcd.setCursor(16, 1);101102 // set the display to automatically scroll:103104 lcd.autoscroll();105106 // print from 0 to 9:107108 for (int thisChar = 0; thisChar < 10; thisChar++) {109110 lcd.print(thisChar);111112 delay(500);113114 }115116 // turn off automatic scrolling117118 lcd.noAutoscroll();119120 // clear screen for the next loop:121122 lcd.clear();123}

Blink Example

This example sketch shows how to use the

and

blink()

methods to blink a block-style cursor.

noBlink()

1/*23 LiquidCrystal Library – Blink45 Demonstrates the use a 16×2 LCD display. The LiquidCrystal67 library works with all LCD displays that are compatible with the89 Hitachi HD44780 driver. There are many of them out there, and you1011 can usually tell them by the 16-pin interface.1213 This sketch prints “Hello World!” to the LCD and makes the1415 cursor block blink.1617 The circuit:1819 * LCD RS pin to digital pin 122021 * LCD Enable pin to digital pin 112223 * LCD D4 pin to digital pin 52425 * LCD D5 pin to digital pin 42627 * LCD D6 pin to digital pin 32829 * LCD D7 pin to digital pin 23031 * LCD R/W pin to ground3233 * 10K resistor:3435 * ends to +5V and ground3637 * wiper to LCD VO pin (pin 3)3839 Library originally added 18 Apr 20084041 by David A. Mellis4243 library modified 5 Jul 20094445 by Limor Fried (http://www.ladyada.net)4647 example added 9 Jul 20094849 by Tom Igoe5051 modified 22 Nov 20105253 by Tom Igoe5455 modified 7 Nov 20165657 by Arturo Guadalupi5859 This example code is in the public domain.6061 http://www.arduino.cc/en/Tutorial/LiquidCrystalBlink6263*/6465// include the library code:66#include 6768// initialize the library by associating any needed LCD interface pin69// with the arduino pin number it is connected to7071const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;7273LiquidCrystal lcd(rs, en, d4, d5, d6, d7);7475void setup() {7677 // set up the LCD’s number of columns and rows:7879 lcd.begin(16, 2);8081 // Print a message to the LCD.8283 lcd.print(“hello, world!”);84}8586void loop() {8788 // Turn off the blinking cursor:8990 lcd.noBlink();9192 delay(3000);9394 // Turn on the blinking cursor:9596 lcd.blink();9798 delay(3000);99}

Cursor

This example sketch shows how to use the

and

cursor()

methods to control an underscore-style cursor.

noCursor()

1/*23 LiquidCrystal Library – Cursor45 Demonstrates the use a 16×2 LCD display. The LiquidCrystal67 library works with all LCD displays that are compatible with the89 Hitachi HD44780 driver. There are many of them out there, and you1011 can usually tell them by the 16-pin interface.1213 This sketch prints “Hello World!” to the LCD and1415 uses the cursor() and noCursor() methods to turn1617 on and off the cursor.1819 The circuit:2021 * LCD RS pin to digital pin 122223 * LCD Enable pin to digital pin 112425 * LCD D4 pin to digital pin 52627 * LCD D5 pin to digital pin 42829 * LCD D6 pin to digital pin 33031 * LCD D7 pin to digital pin 23233 * LCD R/W pin to ground3435 * 10K resistor:3637 * ends to +5V and ground3839 * wiper to LCD VO pin (pin 3)4041 Library originally added 18 Apr 20084243 by David A. Mellis4445 library modified 5 Jul 20094647 by Limor Fried (http://www.ladyada.net)4849 example added 9 Jul 20095051 by Tom Igoe5253 modified 22 Nov 20105455 by Tom Igoe5657 modified 7 Nov 20165859 by Arturo Guadalupi6061 This example code is in the public domain.6263 http://www.arduino.cc/en/Tutorial/LiquidCrystalCursor6465*/6667// include the library code:68#include 6970// initialize the library by associating any needed LCD interface pin71// with the arduino pin number it is connected to7273const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;7475LiquidCrystal lcd(rs, en, d4, d5, d6, d7);7677void setup() {7879 // set up the LCD’s number of columns and rows:8081 lcd.begin(16, 2);8283 // Print a message to the LCD.8485 lcd.print(“hello, world!”);86}8788void loop() {8990 // Turn off the cursor:9192 lcd.noCursor();9394 delay(500);9596 // Turn on the cursor:9798 lcd.cursor();99100 delay(500);101}

Display Example

This example sketch shows how to use the

and

display()

methods to turn on and off the display. The text to be displayed will still be preserved when you use noDisplay() so it’s a quick way to blank the display without losing everything on it.

noDisplay()

1/*2 LiquidCrystal Library – display() and noDisplay()34 Demonstrates the use a 16×2 LCD display. The LiquidCrystal5 library works with all LCD displays that are compatible with the6 Hitachi HD44780 driver. There are many of them out there, and you7 can usually tell them by the 16-pin interface.89 This sketch prints “Hello World!” to the LCD and uses the10 display() and noDisplay() functions to turn on and off11 the display.1213 The circuit:14 * LCD RS pin to digital pin 1215 * LCD Enable pin to digital pin 1116 * LCD D4 pin to digital pin 517 * LCD D5 pin to digital pin 418 * LCD D6 pin to digital pin 319 * LCD D7 pin to digital pin 220 * LCD R/W pin to ground21 * 10K resistor:22 * ends to +5V and ground23 * wiper to LCD VO pin (pin 3)2425 Library originally added 18 Apr 200826 by David A. Mellis27 library modified 5 Jul 200928 by Limor Fried (http://www.ladyada.net)29 example added 9 Jul 200930 by Tom Igoe31 modified 22 Nov 201032 by Tom Igoe33 modified 7 Nov 201634 by Arturo Guadalupi3536 This example code is in the public domain.3738 http://www.arduino.cc/en/Tutorial/LiquidCrystalDisplay3940*/4142// include the library code:43#include 4445// initialize the library by associating any needed LCD interface pin46// with the arduino pin number it is connected to47const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;48LiquidCrystal lcd(rs, en, d4, d5, d6, d7);4950void setup() {51 // set up the LCD’s number of columns and rows:52 lcd.begin(16, 2);53 // Print a message to the LCD.54 lcd.print(“hello, world!”);55}5657void loop() {58 // Turn off the display:59 lcd.noDisplay();60 delay(500);61 // Turn on the display:62 lcd.display();63 delay(500);64}

Scroll Example

This example sketch shows how to use the

and

scrollDisplayLeft()

methods to reverse the direction the text is flowing. It prints “Hello World!”, scrolls it offscreen to the left, then offscreen to the right, then back to home.

scrollDisplayRight()

1/*2 LiquidCrystal Library – scrollDisplayLeft() and scrollDisplayRight()34 Demonstrates the use a 16×2 LCD display. The LiquidCrystal5 library works with all LCD displays that are compatible with the6 Hitachi HD44780 driver. There are many of them out there, and you7 can usually tell them by the 16-pin interface.89 This sketch prints “Hello World!” to the LCD and uses the10 scrollDisplayLeft() and scrollDisplayRight() methods to scroll11 the text.1213 The circuit:14 * LCD RS pin to digital pin 1215 * LCD Enable pin to digital pin 1116 * LCD D4 pin to digital pin 517 * LCD D5 pin to digital pin 418 * LCD D6 pin to digital pin 319 * LCD D7 pin to digital pin 220 * LCD R/W pin to ground21 * 10K resistor:22 * ends to +5V and ground23 * wiper to LCD VO pin (pin 3)2425 Library originally added 18 Apr 200826 by David A. Mellis27 library modified 5 Jul 200928 by Limor Fried (http://www.ladyada.net)29 example added 9 Jul 200930 by Tom Igoe31 modified 22 Nov 201032 by Tom Igoe33 modified 7 Nov 201634 by Arturo Guadalupi3536 This example code is in the public domain.3738 http://www.arduino.cc/en/Tutorial/LiquidCrystalScroll3940*/4142// include the library code:43#include 4445// initialize the library by associating any needed LCD interface pin46// with the arduino pin number it is connected to47const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;48LiquidCrystal lcd(rs, en, d4, d5, d6, d7);4950void setup() {51 // set up the LCD’s number of columns and rows:52 lcd.begin(16, 2);53 // Print a message to the LCD.54 lcd.print(“hello, world!”);55 delay(1000);56}5758void loop() {59 // scroll 13 positions (string length) to the left60 // to move it offscreen left:61 for (int positionCounter = 0; positionCounter < 13; positionCounter++) {62 // scroll one position left:63 lcd.scrollDisplayLeft();64 // wait a bit:65 delay(150);66 }6768 // scroll 29 positions (string length + display length) to the right69 // to move it offscreen right:70 for (int positionCounter = 0; positionCounter < 29; positionCounter++) {71 // scroll one position right:72 lcd.scrollDisplayRight();73 // wait a bit:74 delay(150);75 }7677 // scroll 16 positions (display length + string length) to the left78 // to move it back to center:79 for (int positionCounter = 0; positionCounter < 16; positionCounter++) {80 // scroll one position left:81 lcd.scrollDisplayLeft();82 // wait a bit:83 delay(150);84 }8586 // delay at the end of the full loop:87 delay(1000);8889}

Serial to Display Example

This example sketch accepts serial input from a host computer and displays it on the LCD. To use it, upload the sketch, then open the Serial Monitor and type some characters and click Send. The text will appear on your LCD.

1/*2 LiquidCrystal Library – Serial Input34 Demonstrates the use a 16×2 LCD display. The LiquidCrystal5 library works with all LCD displays that are compatible with the6 Hitachi HD44780 driver. There are many of them out there, and you7 can usually tell them by the 16-pin interface.89 This sketch displays text sent over the serial port10 (e.g. from the Serial Monitor) on an attached LCD.1112 The circuit:13 * LCD RS pin to digital pin 1214 * LCD Enable pin to digital pin 1115 * LCD D4 pin to digital pin 516 * LCD D5 pin to digital pin 417 * LCD D6 pin to digital pin 318 * LCD D7 pin to digital pin 219 * LCD R/W pin to ground20 * 10K resistor:21 * ends to +5V and ground22 * wiper to LCD VO pin (pin 3)2324 Library originally added 18 Apr 200825 by David A. Mellis26 library modified 5 Jul 200927 by Limor Fried (http://www.ladyada.net)28 example added 9 Jul 200929 by Tom Igoe30 modified 22 Nov 201031 by Tom Igoe32 modified 7 Nov 201633 by Arturo Guadalupi3435 This example code is in the public domain.3637 http://www.arduino.cc/en/Tutorial/LiquidCrystalSerialDisplay3839*/4041// include the library code:42#include 4344// initialize the library by associating any needed LCD interface pin45// with the arduino pin number it is connected to46const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;47LiquidCrystal lcd(rs, en, d4, d5, d6, d7);4849void setup() {50 // set up the LCD’s number of columns and rows:51 lcd.begin(16, 2);52 // initialize the serial communications:53 Serial.begin(9600);54}5556void loop() {57 // when characters arrive over the serial port…58 if (Serial.available()) {59 // wait a bit for the entire message to arrive60 delay(100);61 // clear the screen62 lcd.clear();63 // read all the available characters64 while (Serial.available() > 0) {65 // display each character to the LCD66 lcd.write(Serial.read());67 }68 }69}

Set Cursor Example

This example sketch shows how to use the

method to reposition the cursor. To move the cursor, just call

setCursor()

with a row and column position. For example, for a 2×16 display:

setCursor()

1lcd.setCursor(0, 0); // top left2lcd.setCursor(15, 0); // top right3lcd.setCursor(0, 1); // bottom left4lcd.setCursor(15, 1); // bottom right

Here is the full example:

1/*23 LiquidCrystal Library – setCursor45 Demonstrates the use a 16×2 LCD display. The LiquidCrystal67 library works with all LCD displays that are compatible with the89 Hitachi HD44780 driver. There are many of them out there, and you1011 can usually tell them by the 16-pin interface.1213 This sketch prints to all the positions of the LCD using the1415 setCursor() method:1617 The circuit:1819 * LCD RS pin to digital pin 122021 * LCD Enable pin to digital pin 112223 * LCD D4 pin to digital pin 52425 * LCD D5 pin to digital pin 42627 * LCD D6 pin to digital pin 32829 * LCD D7 pin to digital pin 23031 * LCD R/W pin to ground3233 * 10K resistor:3435 * ends to +5V and ground3637 * wiper to LCD VO pin (pin 3)3839 Library originally added 18 Apr 20084041 by David A. Mellis4243 library modified 5 Jul 20094445 by Limor Fried (http://www.ladyada.net)4647 example added 9 Jul 20094849 by Tom Igoe5051 modified 22 Nov 20105253 by Tom Igoe5455 modified 7 Nov 20165657 by Arturo Guadalupi5859 This example code is in the public domain.6061 http://www.arduino.cc/en/Tutorial/LiquidCrystalSetCursor6263*/6465// include the library code:66#include 6768// initialize the library by associating any needed LCD interface pin69// with the arduino pin number it is connected to7071const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;7273LiquidCrystal lcd(rs, en, d4, d5, d6, d7);7475// these constants won’t change. But you can change the size of76// your LCD using them:7778const int numRows = 2;7980const int numCols = 16;8182void setup() {8384 // set up the LCD’s number of columns and rows:8586 lcd.begin(numCols, numRows);87}8889void loop() {9091 // loop from ASCII ‘a’ to ASCII ‘z’:9293 for (int thisLetter = ‘a’; thisLetter <= ‘z’; thisLetter++) {9495 // loop over the columns:9697 for (int thisRow = 0; thisRow < numRows; thisRow++) {9899 // loop over the rows:100101 for (int thisCol = 0; thisCol < numCols; thisCol++) {102103 // set the cursor position:104105 lcd.setCursor(thisCol, thisRow);106107 // print the letter:108109 lcd.write(thisLetter);110111 delay(200);112113 }114115 }116117 }118}

Text Direction Example

This example sketch shows how to use the

and

leftToRight()

methods. These methods control which way text flows from the cursor.

rightToLeft()

  • causes text to flow to the left from the cursor, as if the display is right-justified.


    rightToLeft()

  • causes text to flow to the right from the cursor, as if the display is left-justified.


    leftToRight()

This sketch prints

through

right to left, then

through

left to right, then

through

right to left again.

1/*23 LiquidCrystal Library – TextDirection45 Demonstrates the use a 16×2 LCD display. The LiquidCrystal67 library works with all LCD displays that are compatible with the89 Hitachi HD44780 driver. There are many of them out there, and you1011 can usually tell them by the 16-pin interface.1213 This sketch demonstrates how to use leftToRight() and rightToLeft()1415 to move the cursor.1617 The circuit:1819 * LCD RS pin to digital pin 122021 * LCD Enable pin to digital pin 112223 * LCD D4 pin to digital pin 52425 * LCD D5 pin to digital pin 42627 * LCD D6 pin to digital pin 32829 * LCD D7 pin to digital pin 23031 * LCD R/W pin to ground3233 * 10K resistor:3435 * ends to +5V and ground3637 * wiper to LCD VO pin (pin 3)3839 Library originally added 18 Apr 20084041 by David A. Mellis4243 library modified 5 Jul 20094445 by Limor Fried (http://www.ladyada.net)4647 example added 9 Jul 20094849 by Tom Igoe5051 modified 22 Nov 20105253 by Tom Igoe5455 modified 7 Nov 20165657 by Arturo Guadalupi5859 This example code is in the public domain.6061 http://www.arduino.cc/en/Tutorial/LiquidCrystalTextDirection6263*/6465// include the library code:66#include 6768// initialize the library by associating any needed LCD interface pin69// with the arduino pin number it is connected to7071const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;7273LiquidCrystal lcd(rs, en, d4, d5, d6, d7);7475int thisChar = ‘a’;7677void setup() {7879 // set up the LCD’s number of columns and rows:8081 lcd.begin(16, 2);8283 // turn on the cursor:8485 lcd.cursor();86}8788void loop() {8990 // reverse directions at ‘m’:9192 if (thisChar == ‘m’) {9394 // go right for the next letter9596 lcd.rightToLeft();9798 }99100 // reverse again at ‘s’:101102 if (thisChar == ‘s’) {103104 // go left for the next letter105106 lcd.leftToRight();107108 }109110 // reset at ‘z’:111112 if (thisChar > ‘z’) {113114 // go to (0,0):115116 lcd.home();117118 // start again at 0119120 thisChar = ‘a’;121122 }123124 // print the character125126 lcd.write(thisChar);127128 // wait a second:129130 delay(1000);131132 // increment the letter:133134 thisChar++;135}

Custom Character

This example demonstrates how to add custom characters on an LCD display.

Note that this example requires an additional potentiometer:

  • Outer pins connected to 5V and GND.
  • Inner pin (wiper) connected to A0.

This potentiometer controls the

variable.

delayTime

1/*2 LiquidCrystal Library – Custom Characters34 Demonstrates how to add custom characters on an LCD display.5 The LiquidCrystal library works with all LCD displays that are6 compatible with the Hitachi HD44780 driver. There are many of7 them out there, and you can usually tell them by the 16-pin interface.89 This sketch prints “I

Arduino!” and a little dancing man10 to the LCD.1112 The circuit:13 * LCD RS pin to digital pin 1214 * LCD Enable pin to digital pin 1115 * LCD D4 pin to digital pin 516 * LCD D5 pin to digital pin 417 * LCD D6 pin to digital pin 318 * LCD D7 pin to digital pin 219 * LCD R/W pin to ground20 * 10K potentiometer:21 * ends to +5V and ground22 * wiper to LCD VO pin (pin 3)23 * 10K poterntiometer on pin A02425 created 21 Mar 201126 by Tom Igoe27 modified 11 Nov 201328 by Scott Fitzgerald29 modified 7 Nov 201630 by Arturo Guadalupi3132 Based on Adafruit’s example at33 https://github.com/adafruit/SPI_VFD/blob/master/examples/createChar/createChar.pde3435 This example code is in the public domain.36 https://docs.arduino.cc/learn/electronics/lcd-displays#custom-character3738 Also useful:39 http://icontexto.com/charactercreator/4041*/4243// include the library code:44#include 4546// initialize the library by associating any needed LCD interface pin47// with the arduino pin number it is connected to48const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;49LiquidCrystal lcd(rs, en, d4, d5, d6, d7);5051// make some custom characters:52byte heart[8] = {53 0b00000,54 0b01010,55 0b11111,56 0b11111,57 0b11111,58 0b01110,59 0b00100,60 0b0000061};6263byte smiley[8] = {64 0b00000,65 0b00000,66 0b01010,67 0b00000,68 0b00000,69 0b10001,70 0b01110,71 0b0000072};7374byte frownie[8] = {75 0b00000,76 0b00000,77 0b01010,78 0b00000,79 0b00000,80 0b00000,81 0b01110,82 0b1000183};8485byte armsDown[8] = {86 0b00100,87 0b01010,88 0b00100,89 0b00100,90 0b01110,91 0b10101,92 0b00100,93 0b0101094};9596byte armsUp[8] = {97 0b00100,98 0b01010,99 0b00100,100 0b10101,101 0b01110,102 0b00100,103 0b00100,104 0b01010105};106107void setup() {108 // initialize LCD and set up the number of columns and rows:109 lcd.begin(16, 2);110111 // create a new character112 lcd.createChar(0, heart);113 // create a new character114 lcd.createChar(1, smiley);115 // create a new character116 lcd.createChar(2, frownie);117 // create a new character118 lcd.createChar(3, armsDown);119 // create a new character120 lcd.createChar(4, armsUp);121122 // set the cursor to the top left123 lcd.setCursor(0, 0);124125 // Print a message to the lcd.126 lcd.print(“I “);127 lcd.write(byte(0)); // when calling lcd.write() ‘0’ must be cast as a byte128 lcd.print(” Arduino! “);129 lcd.write((byte)1);130131}132133void loop() {134 // read the potentiometer on A0:135 int sensorReading = analogRead(A0);136 // map the result to 200 – 1000:137 int delayTime = map(sensorReading, 0, 1023, 200, 1000);138 // set the cursor to the bottom row, 5th position:139 lcd.setCursor(4, 1);140 // draw the little man, arms down:141 lcd.write(3);142 delay(delayTime);143 lcd.setCursor(4, 1);144 // draw him arms up:145 lcd.write(4);146 delay(delayTime);147}

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I’m using a Qapass 1602A LCD screen for a arduino project to display something. When wiring up the screen the text in the code won’t show and the backlight is the only visible thing showing to know if it’s working, thank you!

Code:

#include // initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print(“hello, world!”);
}
void loop() {
// Turn off the blinking cursor:
lcd.noBlink();
delay(3000);
// Turn on the blinking cursor:
lcd.blink();
delay(3000);
}

My wiring:

LCD RS pin to digital pin 12
LCD Enable pin to digital pin 11
LCD D4 pin to digital pin 5
LCD D5 pin to digital pin 4
LCD D6 pin to digital pin 3
LCD D7 pin to digital pin 2
LCD R/W pin to ground
LCD A pin 15 to Power 3.3V
LCD K pin 16 to GND
LCD VSS pin 1 to GND
LCD VDD pin 2 to Power 5V

More Information:

All the Pins on the LCD

VSS, VDD, VO, RS, RW, E, DO, D1, D2, D3, D4, D5, D6, D7, A, K

Yes I do have the Elegoo tutorial I just want it to appear Hello World! for testing. Also is there a way to directly connect this with jumper wires to Arduino and without 10k resistor or potenciometer, thank you for answering!

#include // initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
// set up the LCD’s number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print(“hello, world!”);
}
void loop() {
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis() / 1000);
}

Thanks for the help, I see what you mean with the potenciometer I just wanted no extra parts far as breadboards so I could move it around not stay in place. I will use a potenciometer or another type of screen thanks for everything!

If you do not have a potentiometer, just connect pin#3 (VO) directly to GND. This should give you a readable display.
Or try a 470R between VO and GND. Experiment with 0R, 220R, 470R, 680R and choose the best contrast.

Oh, if you ever want to buy a new 16×2, the I2C versions are cheap, work well, use less wires, …

Yes it came with potenciometers but I couldn’t find one. Also my LCD screen went back to only showing the white blocks and I can’t upload code to the Arduino anymore as well, can anyone help me I really need the help.

You have, at your disposal, a kit with a 200+ pages tutorial, at least 120 resistors and at least 2 potenciometer… “I couldn’t find one” is no excuse… look for them, buy them, ask for them. Salvaging electronics parts is no good (what range was the potenciometer you salvaged?). Messing with wires is even worse: just a few second of short circuiting will fry your board and your display.

Please FOLLOW THE TUTORIAL, LESSON 22, just once.

Btw, hoping that you din’t make any irreparable mistake, please explain what you mean by “you can’t upload the code”.
Does Arduino IDE recognize the board?
Does the board’s led blink when on?
Do you get any error message?
Is the cable connected in the correct port?

You ask, ask, ask for help, but it seems to me you are doing everything in your power in order to NOT HAVE a working project.

Step202:
Yes it came with potenciometers but I couldn’t find one. Also my LCD screen went back to only showing the white blocks and I can’t upload code to the Arduino anymore as well, can anyone help me I really need the help.

If possible…… buy a few of these lcd modules. If you accidentally damage one….. or if you suspect damage…. then at least you have plan B.

I have used an elegoo board with 16×2 before as well, with the same code and it failed to work. by switching the same circuit to another board I got everything to work perfectly. The elegoo board could be at fault, but this is only a sample size of 2 so don’t jump to conclusions.

This article gives you a step-by-step guide to becoming a pro in using Liquid Crystal Display. We will use a free Arduino Simulator to try all the examples without leaving your PC. No hardware is needed.

Important Links

Wokwi Arduino Simulator – https://wokwi.com

Documentation on LCD – https://docs.wokwi.com/parts/wokwi-lcd1602

Facebook group to seek support on the Arduino Simulator – https://docs.wokwi.com/parts/wokwi-lcd1602

What is an LCD?

LCD stands for Liquid Crystal Display. The very commonly used LCD type is 16×2 LCD, and it has two rows and 16 columns.

Here is the table with the LCD pin description. This will help you understand and debug the project later in an intelligent way.

You will also find LCDs with an I2C interface. Fewer Pins will lead to easier connection—less messy wires.

So, based on the LCD, you will have to tell the Arduino UNO which type of LCD you are using. You will see this in the sections later.

The LCD1602 uses the Hitachi HD44780 LCD controller chip. The chip comes with a built-in font and the ability to define up to 8 custom characters.

There are two versions of the chip’s ROM with two different fonts: HD44780UA00, Japanese katakana characters, and HD44780UA02, which includes Western European characters.

Wokwi simulates the HD44780UA00 variant. It has a total of 256 characters:

You can see that the first eight characters are user-defined. It allows you to create custom shapes and store them. You will see how to create custom characters and load them in your following Arduino projects. Let us start with a basic example.

Example 1 – Basic example with LCD “Hello World” Example on I2C interface

We will print a simple text on the LCD using Arduino UNO in this example. In this case, you control what is displayed on the Arduino readily. You only need four cables. Power, Ground, I2C data, and I2C clock.

Here is the code


/* Hello Wokwi! */

#include LiquidCrystal_I2C lcd(0x27, 20, 4);void setup() {lcd.init();lcd.backlight();lcd.setCursor(1, 0);lcd.print(“Hello, Wokwi!”);}void loop() {}

Connection diagram: LCD and Arduino UNO

Project link: https://wokwi.com/projects/325996799788581459

Use the link above to run the code. You can tinker with the code to change the text displayed or the position. The best thing about the link is that it will save the project as your version. It will be automatically saved under my projects tab on the wokwi site if you are logged in.

Let us take a minute and see the code line by line. Let me try to explain the purpose of each code one by one.

The below line code adds the LCD library to your project. This consists of all the LCD-related functions. Since we are using the I2C version, we have included the standard LCD library made for the I2C version.


#include

Below, we are creating an object called LCD. We pass the I2C address, the number of columns, and the number of rows.

Can you let me know the parameters in the comments if we want to use an LCD2004 instead of LCD1602?


LiquidCrystal_I2C lcd(0x27, 16, 2);

The following line of the code resets and initializes all the LCD registers and prepares them for project usage. This function will be called only once in the

setup()

function.


lcd.init();

To turn on the backlight, you can use the below code. You will be able to see the contents of the display without a backlight, too, if it is a green LCD. Backlight, nevertheless, makes the project more beautiful and reading crisper.


lcd.backlight();

You can mention where the characters should be displayed. You can always use the below function to set/reset the cursor position. This function will be beneficial when you have to display time or a counter that demands the cursor to always be in the same position.

The first parameter tells the position column-wise ( indicated first place, indicates the second place, and so on). The second parameter tells the row number. We have only two rows ( and ).


lcd.setCursor(1, 0);

The last thing to be seen is the below line, where we actually send a message. In this case a string

Hello, Wokwi

is sent!


lcd.print("Hello, Wokwi!");

This completes a basic introduction to the LCD as well as an example project to start the LCD exploration. In the coming sections, we will see different projects as soon as possible 🚧

Example 2 – Basic example with LCD “Hello World” Example on Parallel interface

You will often see the LCD1602 interface connected with Arduino UNO. Here you will use a few control lines, and 4 data lines for communication.

Here is the example connection diagram

  • Arduino

    PIN.7

    -> D7
  • Arduino

    PIN.8

    -> D6
  • Arduino

    PIN.9

    -> D5
  • Arduino

    PIN.10

    -> D4
  • Arduino

    PIN.11

    -> E
  • Arduino

    PIN.GND

    -> RW
  • Arduino

    PIN.5V

    -> RS

Code


// LCD1602 to Arduino Uno connection example

#include LiquidCrystal lcd(12, 11, 10, 9, 8, 7);void setup() {lcd.begin(16, 2);// you can now interact with the LCD, e.g.:lcd.print(“Hello World!”);}void loop() {// …}

I am sure you have noticed the differences. The LCD library file you include is now different since we are no more using the I2C interface.

another difference is the constructor parameters you send. This time, you have to send 6 numbers, representing control and data lines as depicted in the pin list above.

Simulation link: https://wokwi.com/projects/294342288335700490

Example 3 – Creating user-defined characters in LCD1602, easy way

Creating custom characters on the LCD is easy. In this example, you will see how to create a character in the shape of a heart.

Project link: https://wokwi.com/projects/294395602645549578

Code:


// LCD1602 custom characters example

#include LiquidCrystal lcd(12, 11, 10, 9, 8, 7);uint8_t heart[8] = {0b00000,0b01010,0b11111,0b11111,0b11111,0b01110,0b00100,0b00000,};void setup() {lcd.createChar(3, heart);lcd.begin(16, 2);lcd.print(” I \x03 Arduino”);}void loop() { }

To create a symbol, you have to define an array with 8 numbers. Basically, you will define which pixels will be lit and which pixels will not be in the array.

Let us see some examples.

Heart shape example

The first line is empty.. so it can be defined as

00000

in binary. The second line will be built using

01010

. The third line will be all ones

11111

I hope you got the idea now. You can compare again the binary values above in the code.

Box shape


uint8_t heart[8] = {

0b11111,0b10001,0b10001,0b10001,0b10001,0b10001,0b10001,0b11111,};

an animation for any future projects (think some games!)

In the following sections, we will see more exciting LCD projects

Example 4 – Working with LCD2004 and Arduino UNO (with some simple animation)

In this project, you will see how to use an LCD2004 module. LCD2004 has 4 rows and 20 columns. The basic function names and constructor pattern remains the same.

You might have even come across the blue color LCD2004 module. It might look something similar to this.

Here is one link: https://wokwi.com/projects/294590769009787402

You can get access to the code and the connection diagram in the link above.

here is how the animation looks!

Simulation link: https://wokwi.com/projects/326034190442168916

Simulation output:

To be continued 😉

To display text on an I2C LCD 1602A display with Arduino, you will need to connect the display to your Arduino board, install the necessary libraries, and write code to control the display.

Here are the basic steps to get started:

In this tutorial we will see how to display text in an LCD display with Arduino.

Arduino UNO

The Arduino UNO is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button. It is the most popular and widely used board among the Arduino boards.

The Arduino UNO can be programmed using the Arduino programming language, which is based on C++. It uses a simple and intuitive programming environment, making it easy for beginners to get started with microcontroller programming.

The Arduino UNO can be connected to various sensors and actuators to control different devices and perform different tasks. For example, it can be used to control motors, read data from sensors, display information on an LCD screen, and communicate with other devices via serial communication protocols such as I2C and SPI.

The Arduino UNO can also be powered by a USB cable or an external power supply, making it easy to use in a wide range of projects and applications. It’s compatible with a wide range of shields (expansion boards) that adds functionality to the board, such as Ethernet, WiFi, and Bluetooth, and it’s widely supported by a strong and active community, which provides a lot of tutorials, examples and libraries to help users to get the most of the board.

LCD I2C 160A display

An LCD I2C 160A display is a type of liquid crystal display (LCD) that uses the I2C communication protocol and has a screen size of 160×128 pixels. The I2C (Inter-Integrated Circuit) protocol is a communication protocol that allows multiple devices to communicate with each other over a shared bus. This means that the LCD display can be connected to a microcontroller, such as an Arduino, using just two wires for communication and power.

The I2C interface allows for a simpler wiring and board design, and also multiple LCD can be connected to a single microcontroller by just changing the I2C address of each display. The size of 160×128 pixels provides a decent resolution for displaying text, images or graphics.

This type of LCD display can be used in various projects such as in home automation, weather station, data logger, etc. It’s also compatible with many development board like Raspberry Pi, Arduino, etc.

connecting wires

Connecting wires are used to connect various components in an electronic circuit. They allow for the transfer of electricity, data, or signals between different devices and components.

When connecting wires to an Arduino or other microcontroller, it is important to pay attention to the correct pinout. The pinout refers to the arrangement of pins on the microcontroller and the corresponding function of each pin. The Arduino pinout can be found in the documentation provided by the manufacturer, or in various resources available online.

To complete the assembly you must connect:

Here is the program to display text on the LCD display.

10

11

12

13

14

#include

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup()

lcd.init(); //display initialization

void loop()

lcd.backlight(); // activate the backlight

lcd.setCursor(0, 0); // stand in the front line

lcd.print(” Carte”); // Display the word ‘card’ on the I2C LCD 1602 display

lcd.setCursor(0,1); // stand on the second line

lcd.print(” Arduino”); // Display the word ‘Arduino’

Note: You must download the LiquidCrystal_I2C library(Download).

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Circuit

Note that this circuit was originally designed for the Arduino UNO. As the Arduino is communicating with the display using SPI, pin 11 & 12 will change depending on what board you are using. For example, on a MKR WiFi 1010, the SPI bus is attached to pin 8 & 11.

Before wiring the LCD screen to your Arduino board we suggest to solder a pin header strip to the 14 (or 16) pin count connector of the LCD screen, as you can see in the image further up.

To wire your LCD screen to your board, connect the following pins:

  • LCD RS pin to digital pin 12
  • LCD Enable pin to digital pin 11
  • LCD D4 pin to digital pin 5
  • LCD D5 pin to digital pin 4
  • LCD D6 pin to digital pin 3
  • LCD D7 pin to digital pin 2
  • LCD R/W pin to GND
  • LCD VSS pin to GND
  • LCD VCC pin to 5V
  • LCD LED+ to 5V through a 220 ohm resistor
  • LCD LED- to GND

Additionally, wire a 10k potentiometer to +5V and GND, with it’s wiper (output) to LCD screens VO pin (pin3).

How to Use I2C LCD with Arduino | Very Easy Arduino LCD I2C Tutorial | Arduino 16x2 LCD I2C Tutorial
How to Use I2C LCD with Arduino | Very Easy Arduino LCD I2C Tutorial | Arduino 16×2 LCD I2C Tutorial

Introduction: LCD 1602 With Arduino Uno R3

In this lesson, we will learnhow to use an LCD1602 to display characters and strings. LCD1602, or 1602 character-type liquid crystal display, is a kind of dot matrix module to show letters, numbers, and characters and so on. It’s composed of 5×7 or 5×11 dot matrix positions; each position can display one character. There’s a dot pitch between two characters and a space between lines, thus separating characters and lines. The number 1602 means on the display, 2 rows can be showed and 16 characters in each. Now let’s check more details!

Step 5: Code

//LCD1602

//You should now see your LCD1602 display the flowing characters “PRIMEROBOTICS” and “hello, world”

//Email:[email protected]

//Website:www.primerobotics.in

#include

// include the library code

/**********************************************************/

char array1[]=” PrimeRobotics “; //the string to print on the LCD

char array2[]=”hello, world! “; //the string to print on the LCD

int tim = 250; //the value of delay time

// initialize the library with the numbers of the interface pins

LiquidCrystal lcd(4, 6, 10, 11, 12, 13);

/*********************************************************/

void setup()

lcd.begin(16, 2); // set up the LCD’s number of columns and rows:

/*********************************************************/

void loop()

lcd.setCursor(15,0); // set the cursor to column 15, line 0

for ( int positionCounter1 = 0; positionCounter1 < 26; positionCounter1++)

lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left.

lcd.print(array1[positionCounter1]); // Print a message to the LCD.

delay(tim); //wait for 250 microseconds

lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner.

lcd.setCursor(15,1); // set the cursor to column 15, line 1

for (int positionCounter2 = 0; positionCounter2 < 26; positionCounter2++)

lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left.

lcd.print(array2[positionCounter2]); // Print a message to the LCD.

delay(tim); //wait for 250 microseconds

lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner.

/**********************************************************/

Liquid Crystal Displays (LCD) with Arduino

Find out how to wire an LCD to an Arduino, and how to use the LiquidCrystal library through a set of useful examples.

This article was revised on 2021/11/18 by Karl Söderby.

The LiquidCrystal library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface.

The LCDs have a parallel interface, meaning that the microcontroller has to manipulate several interface pins at once to control the display. The interface consists of the following pins:

  • A register select (RS) pin that controls where in the LCD’s memory you’re writing data to. You can select either the data register, which holds what goes on the screen, or an instruction register, which is where the LCD’s controller looks for instructions on what to do next.
  • A Read/Write (R/W) pin that selects reading mode or writing mode
  • An Enable pin that enables writing to the registers
  • 8 data pins (D0 -D7). The states of these pins (high or low) are the bits that you’re writing to a register when you write, or the values you’re reading when you read.

There’s also a display contrast pin (Vo), power supply pins (+5V and GND) and LED Backlight (Bklt+ and BKlt-) pins that you can use to power the LCD, control the display contrast, and turn on and off the LED backlight, respectively.

The process of controlling the display involves putting the data that form the image of what you want to display into the data registers, then putting instructions in the instruction register. The LiquidCrystal Library simplifies this for you so you don’t need to know the low-level instructions.

The Hitachi-compatible LCDs can be controlled in two modes: 4-bit or 8-bit. The 4-bit mode requires seven I/O pins from the Arduino, while the 8-bit mode requires 11 pins. For displaying text on the screen, you can do most everything in 4-bit mode, so example shows how to control a 16×2 LCD in 4-bit mode.

How to use a 1602 i2c Serial LCD Display with Arduino
How to use a 1602 i2c Serial LCD Display with Arduino

Step 4: Procedures

Connect K to GND and A to 3.3 V, and then the backlight of the LCD1602 will be turned on. Connect VSS to GND and the LCD1602 to the power source. Connect VO to the middle pin of the potentiometer – with it you can adjust the contrast of the screen display. Connect RS to D4 and R/W pin to GND, which means then you can write characters to the LCD1602. Connect E to pin6 and the characters displayed on the LCD1602 are controlled by D4-D7. For programming, it is optimized by calling function libraries.

Step 1:

Build the circuit.

Step 2:

Download the code from https://github.com/primerobotics/Arduino

Step 3:

Upload the sketch to the Arduino Uno board

Click the Upload icon to upload the code to the control board.

If “Done uploading” appears atthe bottom of the window, it means the sketch has been successfully uploaded.

Note: you may need to adjust the potentiometer on the LCD1602 until it can display clearly.

Step 2: Principle

Generally, LCD1602 has parallel ports, that is, it

would control several pins at the same time. LCD1602 can be categorized into eight-port and four-port connections. If the eight-port connection is used, then all the digital ports of the Arduino Uno board are almost completely occupied. If you want to connect more sensors, there will be no ports available. Therefore, the four-port connection is used here for better application.

Pins of LCD1602 and their functions

VSS: connected to ground

VDD: connected to a +5V power supply

VO: to adjust the contrast

RS: A register select pin that controls where in the LCD’s memory you are writing data to. You can select either the data register, which holds what goes on the screen, or an instruction register, which is where the LCD’s controller looks for instructions on what to do next.

R/W: A Read/Write pin to select between reading and writing mode

E: An enabling pin that reads the information when High level (1) is received. The instructions are run when the signal changes from High level to Low level.

D0-D7: to read and write data

A and K: Pins that control the LCD backlight. Connect K to GND and A to 3.3v. Open the backlight and you will see clear characters in a comparatively dark environment.

Lesson 22 – 1602A LCD Module
Lesson 22 – 1602A LCD Module

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