Tag Archives: dtmf decoder


Cellphone controlled car

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This cellphone-controlled toy car is controlled over a phone line by sending DTMF tones from another cell or landline phone.

Cell-phone controlled car

Cell-phone controlled car

This Project implements the functionality of IVRS (Interactive Voice Response System) technology.

The car is controlled by a Mobile phone that makes a call to the phone attached to the Car. During the call, if any key is pressed, a DTMF (Dual Tone Multi Frequency) tone corresponding to the key is sent at the other end.

The received tone is processed by the Atmega16 microcontroller with the help of MT8870 DTMF decoder.

The decoder converts the tone into an equivalent binary code before sending it to the controller. The controller is pre-programmed to take a decision for any input and, outputs its decision to the motor driver that drives the car in various directions.

Cellphone controlled robot vehicle

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When we talk about wireless robot vehicles, we usually think about the RF circuits. But this project is different. It uses a mobile phone to control the motion of a robotic vehicle, and therefore, the range of operation is as large as the coverage area of the service provider.

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