HM-10. BLE. Arduino UNO. Notify. Bluetooth. AT. iBeacon. Arrhythmia

Juan_Antonio · December 29, 2020, 6:41pm

12.- Keypad in App sends number to Arduino & HM-10, show in LCD-I2C.

This example is based on this topic.

A keypad sends a number of less than 5 digits by BLE HM-10 to Arduino UNO and is displayed on an LCD-I2C

// http://kio4.com/arduino/161_HM10_BLE.htm

#include <Wire.h>
// Pantalla LCD
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
// LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

#include <SoftwareSerial.h>
// El TXD del módulo al pin 2 (RX) del Arduino.
// El RXD del módulo al pin 3 (TX) del Arduino.
SoftwareSerial HM10(2, 3);

// byte caracter = "";  
char caracter = "";  
String mensaje = "";

void setup(){
  Serial.begin(9600);
  HM10.begin(9600);
  lcd.begin(16,2);// Columnas y filas de LCD.
}

void loop(){
  if(HM10.available()) { 
  caracter = HM10.read();
  // Serial.println(caracter);
  mensaje = mensaje + caracter;

  if(caracter == NULL ) { 
     Serial.println(mensaje); 
     mensaje = mensaje.substring(0, mensaje.length() - 1); // Delete last char   
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print(mensaje);
     mensaje = "";
     delay(100);
     }
  } 
}