Mit App Inventor Wifi Arduino | Documentation

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/***********
Juan A. Villalpando
KIO4.COM
25/11/22
Version del módulo 9.2.4
Velocidad 9600
Carga el programa. Ve al Serial Monitor.
Escribe en un navegador 192.168.1.5
Pulsa los botones para encender o apagar el LED13 del Arduino.
***********/
#include

#define DEBUG true
SoftwareSerial esp8266(3,2);
// El TX del módulo al terminal 3 del Arduino.
// El RX del módulo al terminal 2 del Arduino.
void setup()
{
pinMode(13,OUTPUT);
Serial.begin(9600);
esp8266.begin(9600); // Importante la velocidad del módulo.
sendData(“AT+RST\r\n”,2000,DEBUG); // Borra la configuración que tenía el módulo
sendData(“AT+CWJAP=\”Nombre_de_tu_WiFi\”,\”Clave_de_tu_WiFi\”\r\n”, 2000, DEBUG);
delay(5000); // Espera un poco que conecte con el Router.
sendData(“AT+CWMODE=3\r\n”,1000,DEBUG); // Modo de cliente y servidor.
sendData(“AT+CIFSR\r\n”,1000,DEBUG); // En el Serial Monitor aparece la IP de cliente y servidor.
sendData(“AT+CIPMUX=1\r\n”,1000,DEBUG); // Multiples conexiones.
sendData(“AT+CIPSERVER=1,80\r\n”,1000,DEBUG); // El Puerto web es el 80
}
void loop(){
if(esp8266.available()) // Consulta si el módulo está enviando algún mensaje
{
if(esp8266.find(“+IPD,”))
{
delay(500);
int connectionId = esp8266.read()-48;
// Aquí las construcción de la PAGINA WEB.
String webpage = “HTTP/1.1 200 OK\r\n Content-Type: text/html\r\n\r\n\r\n”;
webpage += ”

KIO4.COM

“;
webpage += ”

“;
webpage += ”

\r\n\r\n”;
String cipSend = “AT+CIPSEND=”;
cipSend += connectionId;
cipSend += “,”;
cipSend +=webpage.length();
cipSend +=”\r\n”;
sendData(cipSend,500,DEBUG);
sendData(webpage,500,DEBUG);
// Lee el pin 13
int pin13 = digitalRead(13);
// Retorno de la lectura.
String retorno = “HTTP/1.1 200 OK\r\n Content-Type: text/html\r\n\r\n\r\n”;
if (pin13 == 1) {retorno += ” ON – Encendido”;}
if (pin13 == 0) {retorno += ” OFF – Apagado”;}
// ResponseCode App Inventor
cipSend = “AT+CIPSEND=”;
cipSend += connectionId;
cipSend += “,”;
cipSend += retorno.length();
cipSend +=”\r\n”;
sendData(cipSend,500,DEBUG);
sendData(retorno,500,DEBUG);
// Cierra la conexión
String closeCommand = “AT+CIPCLOSE=”;
closeCommand+=connectionId;
closeCommand+=”\r\n”;
sendData(closeCommand,500,DEBUG);
}
}
}
// Función para Enviar datos al Servidor.
String sendData(String command, const int timeout, boolean debug){
String response = “”;
esp8266.print(command); // Envía la información de command al servidor
long int time = millis();
while( (time+timeout) > millis())
{
while(esp8266.available())
{
// A response van los datos que regresan al servidor.
char c = esp8266.read(); // Va leyendo caracter a caracter.
response+=c;
// Consulta si en la información que regresa al servidor
// viene “GET /enci” o “GET /apag”
// Encenderá o apagará el LED13 del Arduino
if(response.indexOf(“GET /enci”) >0){
// Serial.print(“enciende”);
digitalWrite(13,HIGH);
}
if(response.indexOf(“GET /apag”) >0){
//Serial.print(“apaga”);
digitalWrite(13,LOW);
}
}
}
if(debug)
{
Serial.print(response);
}
return response;
}

// http://kio4.com/arduino/57modulowifi_2.htm
// Juan A. Villalpando
#include

SoftwareSerial esp8266(3,2);
// El TX del módulo al terminal 3 del Arduino.
// El RX del módulo al terminal 2 del Arduino.
int random_1 = 10;
int random_2 = 50;
String random_out = “0,0”;
String input_data = “”;
String fin = “”;
void setup(){
randomSeed(analogRead(A0));
Serial.begin(9600);
esp8266.begin(9600);
sendData(“AT+RST\r\n”,2000); // Borra la configuración que tenía el módulo
sendData(“AT+CWJAP=\”Nombre_de_tu_WiFi\”,\”Clave_de_tu_WiFi\”\r\n”, 2000);
delay(10000); // Espera un poco que conecte con el Router.
sendData(“AT+CWMODE=1\r\n”,1000); // Modo de cliente del Router.
sendData(“AT+CIFSR\r\n”,1000); // En el Serial Monitor aparece la IP del Servidor Web.
sendData(“AT+CIPMUX=1\r\n”,1000); // Multiples conexiones.
sendData(“AT+CIPSERVER=1,80\r\n”,1000); // Crea Servidor Web, puerto 80
}
void loop(){
if(esp8266.available()){
while(esp8266.available()){
char c = esp8266.read();
input_data += c;
if(input_data.indexOf(“genera”) > 0){
random_1 = random(10,50);
random_2 = random(50,99);
random_out = (String) random_1 + “,” + (String) random_2;
input_data = “”;
fin = “finalizado”;
}
}
}
// Return responseContent
if(fin == “finalizado”){
String header = “HTTP/1.1 200 OK\r\n Content-Type: text/html; \r\n”;
header += “Content-Length: “;
header += random_out.length();
header += “\r\nConnection: close\r\n\r\n”;
header += random_out;
sendData(“AT+CIPSEND=” + String(0) + “,” + header.length() + “\r\n”, 500);
sendData(header,1000);
// sendData (“AT+CIPCLOSE=” + String(0) + “\r\n”, 1000);
fin = “”;
}
}
// Envia datos al servidor y recibe la respuesta de los AT.
String sendData(String command, const int timeout){
String response = “”;
esp8266.print(command); // Envía la información de command al servidor
long int time = millis();
while( (time+timeout) > millis()){
while(esp8266.available()){
// A response van los datos que regresan al servidor.
char c = esp8266.read(); // Va leyendo caracter a caracter.
response+=c;
}
}
Serial.print(response);
return response; // Devuelve la respuesta del AT
}

It took me a while to figure out how the web server “knew” to work off IP address 192.168.1.9, but then I saw it in the COM24 log as the result of the AT+CIFSR command, and I imagine you read that output to get the IP address hard coded into the AI2 app.

Now we are going to carry out the previous example but we will create an Access Point (SoftAP – Soft Access Point), that is, the module will create a network independent from the Router, it will not be connected to the Router.

The code will create a network called ESP_81411C and the Web Server will have as IP: 192.168.4.1

For this we will change these lines…

void setup(){
randomSeed(analogRead(A0));
Serial.begin(9600);
esp8266.begin(9600);
sendData(“AT+RST\r\n”,2000); // Borra la configuración que tenía el módulo
// sendData(“AT+CWJAP=\”Nombre_de_tu_WiFi\”,\”Clave_de_tu_WiFi\”\r\n”, 2000);
// delay(10000); // Espera un poco que conecte con el Router.
sendData(“AT+CWMODE=2\r\n”,1000); // NOW IS A SOFT ACCESS POINT, MODE = 2
sendData(“AT+CIFSR\r\n”,1000); // En el Serial Monitor aparece la IP del Servidor Web. (192.168.4.1)
sendData(“AT+CIPMUX=1\r\n”,1000); // Multiples conexiones.
sendData(“AT+CIPSERVER=1,80\r\n”,1000); // Crea Servidor Web, puerto 80
}

We must change the IP in the code…

It is also convenient to install the application, since we are going to change the network and the MIT Companion will be in the Router’s network.

Once the application is installed, we go to the WiFi configuration and establish the ESP_81411C network

It is not necessary to put a Password since in this default configuration it does not have it.

If we wanted to change the name of the network and put a password on it, we would put this line:

3.- Remove the Serial Monitor, in case you have it open.

4.- We load this sketch in the IDE and upload it…

It is convenient from time to time to remove the power from the ESP8266 and put it back if it does not load well.

Summary

/*
* This sketch demonstrates how to set up a simple HTTP-like server.
* The server will set a GPIO pin depending on the request
* http://server_ip/gpio/0 will set the GPIO2 low,
* http://server_ip/gpio/1 will set the GPIO2 high
* server_ip is the IP address of the ESP8266 module, will be
* printed to Serial when the module is connected.
*/
#include

const char* ssid = “nombredemirouter”;
const char* password = “contraseñadelrouter”;
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
void setup() {
Serial.begin(9600);
delay(1500);
// prepare GPIO2
pinMode(2, OUTPUT);
digitalWrite(2, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}
Serial.println(“”);
Serial.println(“WiFi connected”);
// Start the server
server.begin();
Serial.println(“Server started”);
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println(“new client”);
while(!client.available()){
delay(1);
}
// Read the first line of the request
String req = client.readStringUntil(‘\r’);
Serial.println(req);
client.flush();
// Match the request
int val;
if (req.indexOf(“/gpio/0”) != -1)
val = 0;
else if (req.indexOf(“/gpio/1”) != -1)
val = 1;
else {
Serial.println(“invalid request”);
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(2, val);
client.flush();
// Prepare the response
String s = “HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n

\r\n

\r\nGPIO is now “;
s += (val)?”high”:”low”;
s += ”

\n”;
// Send the response to the client
client.print(s);
delay(1);
Serial.println(“Client disonnected”);
// The client will actually be disconnected
// when the function returns and ‘client’ object is detroyed
}

5.- When there is upload, remove the GPIO 0 to GND cable and open the Serial Monitor. Restart.

6.- Once the sketch is loaded we can remove the Arduino, connect an LED to the GPIO2 and feed the module with 3.3V

If you don’t have a 3.3V power supply, you can use the Arduino to power the module, note that you don’t need RX or TX.

I want to send temperature sensor data whenever a button named get temperature is pressed on app it should display the current temperature value. I am able to see new client request whenever I click the button and also Arduino serial print but it does not appear on the app text box… Please help

Welcome,

Most of the devices does not have the temperature sensor. See the documentation.

A sensor component that can measure the ambient (external) temperature. Most Android devices do not have this sensor.

They’re using an Arduino Temperature Sensor

Oh, I thought it is an Android sensor

This may help you:

Thanks @NishyanthKumarbut i m using Wifi instead of bluetooth … Here is the sample blocks which i want to use please ignore the cross marks as this is just an example. What i want to do is there is a button on my app which is getTemp when i press that button it sends new client request to esp8266 and whatever output in the form of text i get on serial monitor of arduino should get updated on the text box (temp) located just above the button.ill also provide sample arduino code here i have given constant temp example but it is a variable in my case and its changing

#include

const char* ssid = “JioFi2_C4FFC1”;const char* password = “######”;WiFiServer server(80);

void setup() {Serial.begin(38400);


Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(100); //500 Serial.print("."); } Serial.println(""); Serial.println("Wifi Connected"); Serial.println("Server started "); Serial.println(WiFi.localIP());


server.begin();

}void loop() {string temp=38*cWiFiClient client = server.available();if (!client){return;}Serial.println(“new client”);while(!client.available()){delay(1);}String req = client.readStringUntil(‘\r’);Serial.println(req);


if (req.indexOf("/getTemp")!=-1) { client.println(temp); Serial.println(temp); } String web = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n"; client.print(web); client.flush();


Ah, sorry. Didn’t see that.I’m not the best at Arduino (I don’t know C++), but @Juan_Antonio and @NissanCedric are the go-to people to ask in its terms inside of this Community.

Check

Thanks @Juan_AntonioI have already gone through these two links but the problem with in my case is that I want to receive the text that obtained on serial monitor of Arduino but these 2 examples will send data from to esp device do I need to make any change in Arduino code or in app blocks to receive text from esp device to app using wifi.. … Please help

Here many examples with ESP32

Check your phone to see if its web browser can reach that 192.168… address.

You may need to switch from your cell service’s net access to local WiFi access to get there.

thanks for your support @Juan_Antonio I tried your example of analog read from potentiometer… but in my case it displays “Error1101: unable to connect to specific URL http://192.168.1.184/temp”i made the same program as like yours but to get temperature data in form of stringthe only difference here is :this is from your code-if (req.indexOf(“consulta”) != -1){valor = analogRead(Ent_Anilogica);valor_map = map(valor, 0, 4095, 0, 330);Serial.println(valor);}

this is from my code-if (req.indexOf(“/getTemp”)!=-1){client.println(temp);Serial.println(temp);}

I can’t understand why its not working please help.

@Sneha_JangidTry

if(req.indexOf(“getTemp”)!=-1)

@Juan_Antonio did but same error

@ABG checked but not working

#include

const char* ssid = “XXXXXXX”;const char* password = “XXXXXXXXXXXX”;

String temperature = “34”;

WiFiServer server(80);

void setup() {Serial.begin(115200);

// Conecta a la red wifi.Serial.println();Serial.print(“Conectando con “);Serial.println(ssid);

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {delay(500);Serial.print(“.”);}Serial.println(“Conectado con WiFi.”);

// Inicio del Servidor web.server.begin();Serial.println(“Servidor web iniciado.”);

// Esta es la IPSerial.print(“Esta es la IP para conectar: “);Serial.print(“http://”);Serial.print(WiFi.localIP());}

void loop() {// Consulta si se ha conectado algún cliente.WiFiClient client = server.available();if (!client) {return;}

Serial.print(“Nuevo cliente: “);Serial.println(client.remoteIP());

// Espera hasta que el cliente envíe datos.while(!client.available()){ delay(1); }

/////////////////////////////////////////////////////// Lee la información enviada por el cliente.String req = client.readStringUntil(‘\r’);Serial.println(req);

// Realiza la petición del cliente.if (req.indexOf(“consulta”) != -1){temperature = String(random(1,100));Serial.println(temperature);delay(10);}

//////////////////////////////////////////////// Página WEB. ////////////////////////////client.println(“HTTP/1.1 200 OK”);client.println(“Content-Type: text/html”);client.println(“”); // Importante.

client.println(temperature);

Serial.print(“Cliente desconectado: “);Serial.println(client.remoteIP());// client.flush();}

Here with a potentiometer:http://kio4.com/arduino/347B_esp8266_AI2_Potenciometro.htm

@Sneha_Jangid did it work ?

Hey guys, I need to create an app by app inventor. It should be able to receive strings from Arduino via ESP8266.
I need an app inventor extension of the WiFi module.
I have seen so many module of Bluetooth or wifi module that can only send messages to Arduino.

So I need an extension that can receive data from Arduino via WiFi module.
Any idea? Thank you very much!

My extension works with TCP/IP. I can’t tell if it works with your WIFI card.
If you are going to connect to the Arduino from time to time, and use your phone for other tasks as well, then I think it’s better to let the Arduino be the server and your phone be a client. Then use polling as suggested before. This will be easier to implement.

Dear @Junrong_Huang,
I’m struggling since a couple of days with a problem similar to yours.
Behind the scene: => I wanted to make something like a home automation/antitheft system on my own.
I have then bought 3 NODEMCU8266 and some PIR sensors (Arduino compatibles).
The aim is to have a PAD (or phone) with an AI2 application to behave as the “controller” of the various NODEMCU’s in a totally local WiFi network, without any router (therefore no remote control via WEB).
.I’ve then decided to have a structure like:
1 NODEMCU (#1) acting as a soft Access Point in Server configuration. It acquires the PIR and drives two relays (when it receives the command by each of the other two NODEMCU’s).
2 NODEMCU’s (#2 and #3) acting as Stations (STA) in Client configuration, Every 5 seconds they send a relay ON/OFF request to the AP, just to see whether they are alive and connected.
1 PAD (Lenovo M8 Android 9) in Client configuration, acting as User Interface or Controller. It can send a relay ON/OFF command by hitting on two buttons (of the PAD screen). On the screen are also shown the HTML strings as they come from the AP. No extensions used, just blocks.
With my configuration, in which the PAD (phone) is a client, I found that the “easy” way to receive messages from the server, is to set a periodical clock (i.e. 250 ms) on the PAD, so the PAD can ask the server if there are any news (like it was sent unsolicited by the server: see [(@rkl099) Rolf’s answer].
In other words, by means of a 250 ms clock, the PAD (phone) asks the server to respond with some updates. If the server has some news to transmit to the client, it sends this new information, else, it sends the string “nothing to say”. As soon as the string is received by the PAD, the app parses it, and decides consequently (i.e. “nothing to say” = no actions ).
The .aia and the .ino files that you find attached are really far from being “ready to use” but, anyway, they are working in my configuration, as described above and I guess they can be a good base that you can elaborate to get your needs Auto_Home_04 _1.aia (103.0 KB) ESP_8266_base.ino (8.1 KB)

EDIT: removed yesterday’s Client .ino. Replaced with a commented one:

I know you are at the experimental stage but it is best to not have any unused cables near the Arduino and no cables should be near the module other than the ones connected to it. ESP-01S ESP8266 Module should work just fine, make sure it’s in good condition -check for hairline cracks with a magnifying glass and test the cabling for continuity. Need to be sure you start with a good base

I saw several projects that integrate APP Inventor with Arduino,
unfortunately I only found projects where data from arduino sensors
are replicated on the mobile screen or actuators are turned on or off.

Would anyone know of an example where the mobile APP can pass a value
to an Arduino variable?

For example, turning on a lamp if the level of the photoresistor is
less than x, and the value of x is can be changed on the application
screen (typing the value or using a slider, etc.)

If you would like to have full control over ESP, send and read data. Also be able to control ESP remotely, e.g. from work, read about the MQTT protocol. There is a nice MQTT extension for appinvwntor and lots of libraries for arduino. There are also many free mqtt brokers (servers) available. You can also create your own server, e.g. using the android application. This way you can also control esp from e.g. the google assistant.

Here is English translated Wifi Led control project, But I am still trying to write correct code for Nodemcu
Also I will have to findout How to upload LEDWifi_ESP_BIJ_1Aia Project file here for community

Điều khiển thiết bị bằng MIT App Inventor sử dụng NodeMCU ESP8266

Trong nội dung bài viết hôm nay mình sẽ giới thiệu với các bạn một chủ đề mới cách có thể tạo một App Android trên MIT App Inventor một cách nhanh chóng mà không cần phải biết về lập trình nhiều.

Bài viết sẽ hướng dẫn các bạn cách tạo một App đơn giản và điều khiển các thiết bị trong gia đình thông qua NodeMCU ESP8266. Để có thể nắm rõ hơn các bạn có thể tìm đọc các bài viết liên quan đến dự án.

Sơ đồ đấu nối

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