Two Bluetooth_HC06 at once with AppInventor. KeyPad 4x4 I2C

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Juan Antonio

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Jul 18, 2018, 9:26:51 AM7/18/18
to mitappinv...@googlegroups.com
Hi friends,

Two Bluetooth HC06 connect at once with App Inventor (Android). Keypad 4x4 I2C. 

0.- Each circuit:
- Arduino.
- Module Bluetooth HC06.
- Keypad 4x4.
- Module I2C to Keypad.

1.- Choose BT1 and/or BT2 by ListPickers

or

2.- If you know address Mac Bluetooth, connect directly by Buttons.


3.- You can ON/OFF Arduino LED13 of BT1 and/or BT2

4.- If you push a key in keypad of BT1, send a char to Label1
5.- If you push a key in keypad of BT2, send a char to Label2

Arduino code:

/////////////////////////////////////// two_bluetooth.ino ///////////////////////////////////////////////////////

// Juan A. Villalpando
// KIO4.COM

#include <Wire.h>
#include <Keypad_I2C.h>

char val;
#define LED13 13

const byte ROWS = 4; 
const byte COLS = 4; 
 
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
 
byte rowPins[ROWS] = {0,1,2,3}; 
byte colPins[COLS] = {4,5,6,7};
 
int i2caddress = 0x27; // Debes cambiar esta dirección por la de tu módulo.
 
Keypad_I2C kpd = Keypad_I2C( makeKeymap(keys), rowPins, colPins, ROWS, COLS, i2caddress);
 
void setup(){
  Serial.begin(9600);
  kpd.begin();
  pinMode(LED13, OUTPUT);
}
 
void loop(){
// Leer datos.
if( Serial.available() ) {
  val = Serial.read();
  
  if( val == '1' )
  { digitalWrite(LED13, HIGH);}
  
  if( val == '2' )
  { digitalWrite(LED13, LOW);}
}
// Enviar datos.
  char key = kpd.getKey();
  if (key){
    Serial.print(key);
    Serial.print("\n"); // Fin de línea. Importante.
  }
  delay(100);
}
///////////////////////////////////////////////////////

7.- Load this code in each Arduino.

8.- Set you addres i2c module in this line: int i2caddress = 0x27;

9.- What is the i2c address of my module?
With this code you can get i2c address: http://kio4.com/arduino/31pantallaLCD.htm#i2c

10.- Remember:

Clock.TimeInterval = 90 delay(100);


Regards.

Juan Antonio Villalpando.
http://kio4.com/appinventor/9X_bluetooth_dos_arduino.htm (Tutorial in Spanish)

p9X_2i_bluetooth.aia

Juan Antonio

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Jul 20, 2018, 4:46:20 PM7/20/18
to MIT App Inventor Forum
What about Bluetooth audio devices (Speaker, Amplifier, ...), in this case only one device can be connected. 

In this post: 

If you need to connect two audio devices at the same time, you can search the internet: Bluetooth multipoint transmitter


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