Description

Beeper with telegram bot and esp32

More info and updates in https://rogerbit.com/wprb/2024/06/beeper/

In this tutorial, you will learn how to configure and use an ESP32 device to receive Telegram messages and display them on an SH1106 display. We will also include the functionality of a button and a buzzer to interact with the system

Requirements

An ESP32.

An SH1106 display (128×64) with I2C interface.

A buzzer.

A button.

Connection cables.

Arduino IDE library installed.

Step 1: Installing the Necessary Libraries

Open the Arduino IDE and make sure you have the following libraries installed:

WiFi.h for WiFi connection.

WiFiClientSecure.h for the secure connection.

UniversalTelegramBot.h to interact with the Telegram bot.

U8g2lib.h to manage the SH1106 display.

You can install them from the Arduino IDE Library Manager by searching for the library names.

Step 2: Hardware Connection

Connect the components according to the following diagram:

Display SH1106:

VCC a 5V del ESP32.

GND a GND del ESP32.

SCL a GPIO 22 del ESP32.

SDA a GPIO 21 del ESP32.

Buzzer:

Positive terminal to GPIO 12 of the ESP32.

Negative terminal to GND of the ESP32.

Button :

A terminal to GPIO 23 of the ESP32.

Another terminal to GND of the ESP32.

Step 3: Telegram Bot Configuration

Create a bot on Telegram using BotFather and get the Bot Token.

Replace TOKEN_BOT in the code with the obtained token.

Replace ssid and password with your WiFi network name and password.

Step 4: Load the Code into the ESP32

Connect the ESP32 to your computer.

Select the ESP32 Dev Module board from the Tools -> Board menu.

Select the correct port from the Tools -> Port menu.

Click Upload to upload the code to the ESP32.

Step 5: System Test

Once the code is loaded, open the Serial Monitor in the Arduino IDE to see the debugging messages.

On the SH1106 display, the message “Waiting for message!” should appear.

Send a message to your Telegram bot. The message should appear on the display and the buzzer should sound.

Electronic components

An Esp32

Features of the ESP32-T module

Connectivity

The ESP32 module has all WiFi variants :

802.11 b/g/n/e/i/n

Wi-Fi Direct (P2P), P2P Discovery, P2P Group Owner mode and P2P Power Management

This new version includes connectivity through low-power Bluetooth

Bluetooth v4.2 BR/EDR and BLE

BLE Beacon

In addition, it can communicate using the SPI, I2C, UART, MAC Ethernet, Host SD protocols.

Microcontroller features

The CPU is made up of a Tensilica LX6 model SoC with the following features and memory

Dual 32-bit core with 160MHz speed

Memoria ROM de 448 kBytes

520kBytes SRAM memory

Dyspnea at 48 Pines

18 ADC de 12 bits

2 DAC de 8 bits

10 pin contact sensors

16 PWM

20 digital inputs/outputs

Food and consumption modes

For correct operation of the ESP32, it is necessary to supply a voltage between 2.8V and 3.6V. The energy it consumes depends on the operating mode. It contains a mode, the Ultra Low Power Solution (ULP) , in which basic tasks (ADC, RTC...) continue to be performed in Sleep mode.

female pins

Male female dupont cables

Display oled sh1106

It is a 128x64 dot monochrome OLED display module with I2C interface. It has several advantages compared to LCD screens, and we can highlight its high brightness, very good contrast, a wider viewing angle, and low consumption. of energy. It is compatible with Arduino Rasberry Pi and PIC microcontrollers among others. It works with logic levels from 3.3V to 5V and has a viewing angle greater than 160 degrees. Screen Size is 1.3 inches. It is powered with a voltage of 3.3V to 5V. It can be used in applications such as smart watches, MP3s, thermometers, instruments, and various projects, etc.

Characteristics

Interface: I2C(3.3V / 5V logic level)

Resolution: 128 x 64

Angle of view: >160 degree

Display color: Blue

Display size: 1.3 inch

Driver IC: SH1106

Power supply: DC 3.3V~5V

Operating temperature: -20~70’C

Application: smart watch, MP3, thermometer, instruments, DIY projects, etc.

Buzzer Module

Module ky-004

PCB

Circuit

Code

Source code

C/C++

#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <U8g2lib.h>
// Configuración del display SH1106 usando U8g2
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE, /* clock=*/ 22, /* data=*/ 21);
// Configuración WiFi
const char* ssid = "Tu-red-WiFi";
const char* contrasena = "Tu-Clave-WiFi";
// Token del bot de Telegram
#define TOKEN_BOT "Tu-Token-Telegram"
// Configuración del buzzer
const int pinBuzzer = 12;
const int duracionBuzzer = 100;  // Duración del sonido en milisegundos
// Configuración del botón
const int pinBoton = 23;
bool botonPresionado = false;
WiFiClientSecure cliente;
UniversalTelegramBot bot(TOKEN_BOT, cliente);
unsigned long ultimaVezBotCorrio;
// ID del último chat para enviar respuestas
String idUltimoChat;
void setup() {
  Serial.begin(115200);
  // Conexión WiFi
  WiFi.begin(ssid, contrasena);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Conectando al WiFi...");
  }
  Serial.println("Conectado al WiFi");  
  // Configuración del display
  u8g2.begin();  
  // Mostrar mensaje inicial en el display
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_unifont_t_symbols);
  u8g2.drawUTF8(0, 10, "Esp. mensaje:");
  u8g2.sendBuffer();  
  // Configuración del buzzer
  pinMode(pinBuzzer, OUTPUT);
  digitalWrite(pinBuzzer, LOW);
  // Configuración del botón
  pinMode(pinBoton, INPUT_PULLUP);
  // Configuración de cliente seguro
  cliente.setCACert(TELEGRAM_CERTIFICATE_ROOT);
}
// Función para dividir el mensaje en líneas que se ajusten al ancho del display
void mostrarTextoLargo(const String &texto) {
  const int alturaLinea = 10;  // Altura de cada línea
  const int maxLineas = 6;     // Máximo número de líneas que caben en el display
  int indiceInicio = 0;
  int indiceFin;
  int linea = 0; 
  while (indiceInicio < texto.length()) {
    indiceFin = indiceInicio;
    int anchoLinea = 0;
    // Encuentra el punto de corte para la línea
    while (indiceFin < texto.length() && anchoLinea < u8g2.getDisplayWidth()) {
      indiceFin++;
      anchoLinea = u8g2.getStrWidth(texto.substring(indiceInicio, indiceFin).c_str());
    }
    // Ajusta el punto de corte para evitar dividir palabras
    if (indiceFin < texto.length()) {
      while (indiceFin > indiceInicio && texto[indiceFin] != ' ') {
        indiceFin--;
      }
    }
    // Muestra la línea en el display
    u8g2.drawUTF8(0, (linea + 1) * alturaLinea, texto.substring(indiceInicio, indiceFin).c_str());
    indiceInicio = indiceFin + 1;
    linea++;    
    // Si el texto es más largo que el display, desplaza el texto
    if (linea >= maxLineas) {
      delay(3000);  // Pausa para leer la página actual
      linea = 0;
      u8g2.clearBuffer();
    }
  }
  u8g2.sendBuffer();
}
void loop() {
  // Verificar si el botón ha sido presionado
  if (digitalRead(pinBoton) == LOW) {
    if (!botonPresionado) {
      // Envía un mensaje a Telegram
      bot.sendMessage(idUltimoChat, "He leído tu mensaje, puedes enviar otro", "");      
      // Sonar el buzzer
      digitalWrite(pinBuzzer, HIGH);
      delay(duracionBuzzer);
      digitalWrite(pinBuzzer, LOW);      
      // Mostrar mensaje en el display
      u8g2.clearBuffer();
      u8g2.setFont(u8g2_font_unifont_t_symbols);
      u8g2.drawUTF8(0, 10, "Mens. enviado!");
      u8g2.sendBuffer();
      botonPresionado = true;
    }
  } else {
    botonPresionado = false;
  }
  // Verificar si hay nuevos mensajes de Telegram
  if (millis() - ultimaVezBotCorrio > 1000) {
    int numNuevosMensajes = bot.getUpdates(bot.last_message_received + 1);
    while (numNuevosMensajes) {
      Serial.println("Nuevo mensaje recibido");
      for (int i = 0; i < numNuevosMensajes; i++) {
        String idChat = bot.messages[i].chat_id;
        String texto = bot.messages[i].text;        
        // Guardar el ID del último chat para enviar respuestas
        idUltimoChat = idChat;        
        // Mostrar mensaje en el display
        u8g2.clearBuffer();
        u8g2.setFont(u8g2_font_unifont_t_symbols); // Selecciona la fuente compatible con Unicode
        mostrarTextoLargo(texto);        
        // Sonar el buzzer
        digitalWrite(pinBuzzer, HIGH);
        delay(duracionBuzzer);
        digitalWrite(pinBuzzer, LOW);        
        bot.sendMessage(idChat, "Mensaje recibido: " + texto, "");
      }
      numNuevosMensajes = bot.getUpdates(bot.last_message_received + 1);
    }
    ultimaVezBotCorrio = millis();
  }
}

Jun 28,2024

318 views

Beeper with telegram bot and esp32

In this tutorial, you will learn how to configure and use an ESP32 device to receive Telegram messages and display them on an SH1106 display

318

Published: Jun 28,2024

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