Bluetooth is used for short range wireless communication. Bluetooth is a standard wire-replacement communications protocol primarily designed for low power consumption, with a short range (power-class-dependent, but effective ranges vary in practice.
Here we see how we can connect the bluetooth module with 8051 microcontroller device
Pin 1: +5 V power supply
Pin 2: Data sending Pin (which can be connected with the RXD serial terminal of other other chips)
Pin 3: Data receiving Pin (which can be connected with the TXD serial terminal of other other chips)
Pin 4: GND Ground
Here is the RS232 Interface of Bluetooth Module:
Once you come with serial port of Bluetooth you can easily interface the serial (RS232) port to 8051 micro controller which given on previous articles. Click here for 8051 – RS232 Interface circuit.
In next article we will learn how to communicate with Bluetooth and control your house hold appliances.
Note: Use right level of power voltage for device. High power to device will leads to damage.