This project is similar to the functioning of an ordinary remote control system which consists of, a transmitter and a receiver. Therefore two mobile phones are required for effective transmission and reception by DTMF .The robot is controlled by the mobile phone held by the user, which communicates with the mobile phone attached to the robot. In the course of a phone call, if any button is pressed, a tone corresponding to the button pressed is heard at the receiver end, which is called ‘Dual Tone Multiple frequency’ (DTMF) tone. The robot receives these tones via the receiver mobile phone which is on board. The received tone is processed by the microcontroller with the help of DTMF decoder IC CM8870DE . This IC communicates with the motor driver IC l293d through the microcontroller interface which drives the motor in forward, reverse, right and left directions according to the user’s key press. The microcontroller featuring in this project will be the AVR microcontroller,ATmega8.
Wh build a DTMF ROBOT?
Conventionally, robots controlled by wireless communication employ radio frequency(RF), which have the drawbacks of limited working range, limited frequency range and the limited control. Use of a mobile phone for robotic control can overcome these limitations. It provides the advantage of robust control, working range as large as the coverage area of the service provider, no interference with other controllers and up to twelve controllers.
Although the appearance and the capabilities of robots vary vastly, all robots share the feature of a mechanical, movable structure under some form of control. The control of the robot involves three distinct phases: perception, processing and action. Generally, the preceptors are sensors mounted on the robot , processing is done by the on-board
microcontroller or processor, and the action is performed using motors WHA T ’ S LA T ES T . .
Make a Robot that
responds to com m ands...