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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 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”
