Using HC-05 Bluetooth Module

Aim of the project is to design a robot whichcan be controlled by Bluetooth of your mobilephone or PC.

An application program running in PC orandroid phone is used to send commands thatare received by Bluetooth module attachedwith the robot.

Microcontroller (ATMega8) development board

PC or Mobile with customizable Bluetooth module

HC-05 Bluetooth module

DC motor

Motor driver IC (L293D)

Wheels

Power adopter

It is required to supply sufficient

current to motors as microcontrollers

can’t supply that much current.

It is a dual H-Bridge motor

means it can drive two DC

motors simultaneously in both

clockwise and anticlockwise

direction.

Its input terminals are controlled

by the microcontroller.

It also includes the protection

circuit against back EMF.

This module is capable of

communicating with PC,

mobile phone or any other

Bluetooth enabled device.

It is interfaced with the

microcontroller over the

serial UART port of micro-

controller.

For this firstly the application program isdeveloped or a readymade program is madeavailable to run on the PC or the mobile phone.

The application program send the commandsin form of ASCII characters which are receivedby HC-05 Bluetooth module and passed tomicrocontroller through UART port ofmicrocontroller.

The microcontroller is programmed to take desired actions according to the command (ASCII character) received to move forward, reverse or to take a turn.

The microcontroller sends logic 1 or 0 at the specified pin to control motors of robot which are attached using motor driver IC (L293D).