Bluetooth controlled robot

Bluetooth Controlled ROBOT
Aim of the project is to design a robot which can be controlled by
Bluetooth of your mobile phone or PC.
An application program running in PC or android phone is used to
send commands that are received by Bluetooth module attached
with the robot.
Overview
Bluetooth Controlled Robot

Hardware components required and their purpose:
1. Microcontroller (ATMega8) development board
2. PC or Mobile phone with customizable Bluetooth module
3. HC-05 Bluetooth module
4. DC motor
5. Motor driver IC (L293D)
6. Wheels
7. Power adopter
 Microcontroller (ATMega8) development board: This is the
brain of this robot in which the program is loaded to do the
required functioning and is interfaced with Bluetooth module
and the motor driver to make the system work as required.
 HC-05 Bluetooth Module: 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.
 PC or Mobile phone with customizable Bluetooth module: this
works as the remote control for the robot. It has an application
program running on it which enables us to send appropriate
command over its Bluetooth module to control the robot.

Bluetooth Module
 DC Motor: This motor is controlled with DC voltages and can
move in forward and backward direction according to the
polarity of the voltage applied.
 Motor driver IC (L293D): Microcontrollers can’t supply the
current required by DC motor to run. So, to fulfill this
requirement these motor driver ICs are used.

DC motors with Driver IC
 Power adopter: This is used to give appropriate dc power
supply to microcontroller, driver IC sensors and the other
passive components of the robot.
 Wheels: In it three wheels are employed, two at rear end and one
at front end. Rear wheels are attached with the motors and also
control the steering of robot. Front wheel is the loose steered
wheel which moves in the direction of the pressure applied to it.

Block Diagram:
Bluetooth Controlled Robot
Description
For this firstly the application program is developed or a
readymade program is made available to run on the PC or the
mobile phone. This application program send the commands in
form of ASCII characters which are received by HC-05 Bluetooth
module and passed to microcontroller through UART port of
microcontroller.

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).
Programming I/O port of ATMega8:
Each port has three i/o registers associated with it which are
designated as DDRx, PORTx, PINx.
Port Registers in ATMega8

DDRx register:
It stands for data direction register. This register is of 8 bits. Value of this
register decides whether the port will act as input port or as output port.
To make any port as input port, the contents of the associated DDRx
register are made 0x00 and to make any port as output port, the contents
of the associated DDRx register are made 0xff.
PORTx register:
This register is responsible for outputting any data to the port. Data to be
outputted to any port is loaded to the corresponding PORTx register after
making the direction of that port as output.
For example:
To send 0x14 to PORTA:-
DDRA=0xFF;
PORTA=0x14;
PINx register:
This register is responsible for inputting data from any port. Data to be
inputted from any port is taken from the corresponding PINx register
after making the direction of that port as input.
For example:
To get data from PORTB:-
DDRA=0x00;
var=PINB; //’var’ is a character type variable

Bluetooth controlled robot

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Bluetooth controlled robot