DTMF SIGNAL PROCESSING FOR EFFICIENT REMOTE CONTROL OF ROBOTIC VEHICLES

Abstract

Dual Tone Multi-Frequency (DTMF) technology, widely used in telecommunication systems, has found new applications in low-cost robotics and wireless control. This study presents the design and implementation of a robotic vehicle controlled by DTMF signals transmitted via a mobile phone. The system utilizes a DTMF decoder interfaced with a microcontroller to process keypad tones and translate them into navigation commands such as forward, reverse, left, right, and stop. Unlike conventional wireless control systems requiring specialized transmitters, the proposed model employs standard mobile communication, enhancing accessibility and reducing cost. The robotic vehicle was tested for response accuracy, signal latency, and operational range. Experimental results demonstrated high reliability, real-time responsiveness, and efficient control without significant signal distortion. The system offers promising applications in remote surveillance, hazardous environment navigation, and low-cost automation, making it an effective solution for wireless robotic control