DTMF Controlled Robot using Arduino and DTMF Decoder

Description

The DTMF Controlled Robot is a mobile robotic platform that operates using Dual Tone Multi-Frequency (DTMF) signals, which are commonly generated by pressing keys on a mobile phone. This system eliminates the need for wireless modules like Bluetooth or RF, instead utilizing the cellular network to receive commands via phone call. When a button is pressed during the call, a specific tone is sent, which is decoded by a DTMF decoder and then interpreted by a microcontroller to control the robot’s movement.

The robot typically includes components such as a DTMF decoder (like the MT8870), a microcontroller (such as Arduino or 8051), a motor driver module, and DC motors for movement. When a call is made to the mobile phone attached to the robot, and keys are pressed, each key produces a unique tone. The DTMF decoder processes these tones into digital signals, which are then mapped to motion instructions (e.g., ‘2’ for forward, ‘8’ for backward, ‘4’ for left, and ‘6’ for right).

This robot can move in all four directions depending on the input received. It is especially useful in environments where radio signals are unreliable or in long-distance operations where traditional remote controls are ineffective. Since the system relies on GSM signals, the robot can be controlled from virtually anywhere with mobile network coverage, offering a wide control range.

Applications of the DTMF controlled robot include remote surveillance, search and rescue operations, and automation in areas that are difficult or unsafe for humans to access. The design is relatively simple and cost-effective, making it a popular choice for academic projects and hobbyists interested in wireless robotics and embedded systems.