Connect an Arduino to a $7 Bluetooth Serial Module

You will need to identify the 5V and Ground pins on your Arduino in order to provide the power source for activating your Bluetooth serial module. Connect the Bluetooth module’s RX pin to the Arduino’s TX pin. Connect the Bluetooth module’s TX pin to the Arduino’s RX pin.

• After connecting the Bluetooth serial module to your Arduino you are able to pair the Bluetooth module with any Bluetooth-enabled device. Use ’1234′ as the pairing key.
• There is no additional library necessary for communication. The Bluetooth module replaces a normal serial cable on RX and TX.
• The Arduino code for writing to the Bluetooth serial module is quite simple: void setup() { Serial.begin(9600); } void loop() { Serial.println("test"); delay(1000); }
• For receiving the output on your PC just open a terminal program, or Putty, and connect to the COM port of your Bluetooth Serial profile (e.g. COM3 on my PC).