Android BluetoothChat connect to Arduino Uno + HC-05

Last example show "Android BluetoothChat example link with HC-05 Bluetooth", to connect to PC via FTDI adapter. Here is another example - Arduino UNO + HC-05 to echo received data back to the sender.

For my on-hand HC-05 sample, it set as slave role and 9600, 0, 0, PIN="1234" by default. So it can be used in this example without any extra setting.

Connection between UNO and HC-05
HC-05 Rx - Uno Tx (1)
HC-05 Tx - Uno Rx (0)
HC-05 GND - Uno GND
HC-05 VCC - Uno 5V
(My HC-05 marked "Power: 3.6V-6V", refer here, make sure your HC-05 can work on 5V.)

Uno_Serial_echo.ino

/*
Arduino Uno + HC-05 (Bluetooth) - echo bluetooth data

Serial (Tx/Rx) communicate to HC-05
HC-05 Rx - Uno Tx (1)
HC-05 Tx - Uno Rx (0)
HC-05 GND - Uno GND
HC-05 VCC - Uno 5V

*/

void setup()
{
  delay(1000);
  Serial.begin(9600);
}

void loop()
{
  while(Serial.available())
  {
    char data = Serial.read();
    Serial.write(data);
  }
}

This video show how Android BluetoothChat example link with Arduino UNO + HC-05. For the Android BluetoothChat example, refer last post.


Related:
- Connect Arduino Due with HC-06 (Bluetooth Module)