mehulnagar12 / bluetooth-controlled-home-automation

Using Bluetooth to control the household devices like fan, light, TV

Bluetooth Module: HC-05

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PIN DESCRIPTION:

1. STATE  --- Open
   

2. Rx  --- Serial receiving pin
   

3. Tx  --- Serial transmitting pin
   

4. GND --- ground
   

5. Vcc ---	+5volt dc
   

6. EN ---  to enter in AT mode
   

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MICRO-CONTROLLER USED: 8051

The pin diagram of 8051 microcontroller looks as follows -

1.    Pins 1 to 8 - These pins are known as Port 1. This port doesn’t serve any other functions. It is internally 
   

   pulled up, bi-directional I/O port.

2.    Pin 9 - It is a RESET pin, which is used to reset the microcontroller to its initial values.
   

3.    Pins 10 to 17 - These pins are known as Port 3. This port serves some functions like interrupts, timer input, 
   

   control signals, serial communication signals RxD and TxD, etc.

4.    Pins 18 & 19 - These pins are used for interfacing an external crystal to get the system clock.
   

5.    Pin 20 - This pin provides the power supply to the circuit.
   

6.    Pins 21 to 28 - These pins are known as Port 2. It serves as I/O port. Higher order address bus signals are 
   

   also multiplexed using this port.

7.    Pin 29 - This is PSEN pin which stands for Program Store Enable. It is used to read a signal from the external 
   

   program memory.

8.    Pin 30 - This is EA pin which stands for External Access input. It is used to enable/disable the external memory 
   

   interfacing.

9.    Pin 31 - This is ALE pin which stands for Address Latch Enable. It is used to demultiplex the address-data signal
   

   of port.

10.    Pins 32 to 39 - These pins are known as Port 0. It serves as I/O port. Lower order address and data bus signals 
    

    are multiplexed using this port.

11.    Pin 40 - This pin is used to provide power supply to the circuit.