Bluetooth HC-06. Arduino. Send. Receive. Send text file. Multitouch. Image

Juan_Antonio · May 22, 2020, 4:53pm

2A.- App sends text. Arduino on-off LED12 and LED13. Serial Monitor. With asterisk.

App sends text: on12*, off12*, on13*, off13*, I have used the astarisk to indicate end of message.
We can also send a text, the astarisk will automatically be inserted at the end of the text.
Check Serial Monitor.

Arduino receives characters up to the asterisk. Example: off12*
Delete the asterisk, last char: off12
Turn off the LED12

// Juan A. Villalpando
// http://kio4.com/appinventor/9A0_Resumen_Bluetooth.htm

#define Pin12  12
#define Pin13  13
char caracter;
String palabra;

void setup() { 
  Serial.begin(9600);
  pinMode(Pin12, OUTPUT); 
  pinMode(Pin13, OUTPUT); 
}

void loop() { 
  if(Serial.available()) {
  caracter = Serial.read();
  palabra = palabra + caracter;

   if(caracter == '*') {    
    palabra = palabra.substring(0, palabra.length() - 1); // Delete last char *
    Serial.println(palabra);
     if (palabra == "on12"){digitalWrite(Pin12, HIGH);}
     if (palabra == "off12"){digitalWrite(Pin12, LOW);}
     if (palabra == "on13"){digitalWrite(Pin13, HIGH);}
     if (palabra == "off13"){digitalWrite(Pin13, LOW);}
     palabra = "";
     delay(100);
   }
  } 
}

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2B.- App sends text. Arduino on-off LED12 and LED13. Serial Monitor. Without asterisk.

p9A0i_bluetooth_texto_2.aia (2.6 KB)

If we expect to receive known words ("on12", "off12",...), it is not necessary to use the asterisk as the end of message.
Using palabra.indexOf(...), we can obtain if the received message contains the "known words".

// Juan A. Villalpando
// http://kio4.com/appinventor/9A0_Resumen_Bluetooth.htm

#define Pin12  12
#define Pin13  13
char caracter;
String palabra;

void setup() { 
  Serial.begin(9600);
  pinMode(Pin12, OUTPUT); 
  pinMode(Pin13, OUTPUT); 
}

void loop() { 
  if(Serial.available()) {
  caracter = Serial.read();
  palabra = palabra + caracter;

     Serial.println(palabra);
     if (palabra.indexOf("on12")>= 0){digitalWrite(Pin12, HIGH); palabra = "";}
     if (palabra.indexOf("off12")>= 0){digitalWrite(Pin12, LOW); palabra = "";}
     if (palabra.indexOf("on13")>= 0){digitalWrite(Pin13, HIGH); palabra = "";}
     if (palabra.indexOf("off13")>= 0){digitalWrite(Pin13, LOW); palabra = "";}   
     delay(100);
  } 
}