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Bluetooth Controlled Robot
USART communication
Briefing
This project aims in wireless control of the robot
from a bluetooth app in a mobile device through
USART communication.
The most significant feature of this wireless
control is the transmitter.
The project is cost efficient and comes handy in
many applications
Components
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Robot frame
Atmega16 microcontroller
Bluetooth module HC05
Voltage regulators 7805
Motor driver L293D
Li-ion battery and Switch
LEDs
Wires
Motors and wheels
Atmega16
Motor Driver L293D
Battery
Volatge Regualtor 7805
Bluetooth Module HC-05
Robot frame , Motor and Wheels
Circuit
Atmega16
Battery
Switch
Voltage
Regulato
r
Motor
Driver
L293D
BT
module
DC motor
Mobile
Wheels
Principle-USART
USART: Universal Synchronous/Asynchronous Receiver Transmitter
USART is an inbuilt feature in the microcontroller
atmega16.
The microcontroller ATmega16 is set to USART
configuration and the signals fed in are directed using embedded C
programmes.
The Output is so set that it creates a variation in
potential whenever required and thus enabling the motor driver to
control the motors that run the wheels of the robot accordingly.
Working
 The bluetooth app sends user defined signal to the BT
module which inturn transmits it to the ATmega16.
 The micro controller employs USART communication to
achieve the reception from the bluetooth module.
 The microcontroller process the received signal through
programmed codes and logics to give the desired output.
 This output helps the motor driver to control the motors.
Transmission
First the bluetooth module should be configured using
AT commands then mobile and the bluetooth module are
paired.
In transmission the signals are going to be transmitted
by the android app (Bluetooth robo controll) through the
mobile.
The transmitted signals reach the bluetooth module
wirelessly which inturns transmit it to the
microcontroller(ATmega16).
Reception
The Tx and Rx pins of HC-05 and ATmega16
respectively are connected.
The microcontroller ATmega16 acts as receiver.
The ATmega16 is programmed to receive the
transmitted signals.
Then the microcontroller process the signals. For each
signal corresponding output can be observed.
Wired USART
Usart to Usart communication using two
microcontrollers(wired)
Programming
the ATmega16one as
transmitter and
other as
receiver
Connecting the
TX and RX pins,
the battery and
others
Transmission
through wire
Enabling a
data
transmissio
n through a
switch
Interception of
the reception
by the aid of
LED
Problems faced and its solution
 PROBLEM: Transmitted signals weren’t received by
the microcontroller
 SOLUTION: Baud rate should be set as per
requirements through trial and error method.
Significance of the project
 The basic idea of this robot can be manipulated into a
surveillance robot and can also be used for remote
accessing.
 Use of class 1 bluetooth module can enable the robot to
amplify the range of reception upto 300m.
 The robot can be a great break through in substitution of
human labour at mining and other hazardous workplaces.
Conclusion
The bluetooth controlled robot is thus made at a costeffective and simple manner and its working is tested and
verified. Further, if required, this model can be fabricated
using PCB and the frame can be modified into a more compact
model for wider applications.
“The birth of the idea doesn’t count if they aren’t laid on to the hands which nurture
them”