Remote Position Control System of Stepper Motor Using DTMF Technology

Stepper motor is found in a lot of applications such as computer peripherals, business machines, process control, machine tools and robotics. Especially in different areas of robotics, process control like silicon processing, I.C. Bonding and Laser trimming applications, it is necessary to control the stepper motor from remote places. The present paper describes a remote angular position control system of stepper motor using DTMF (Dual-Tone Multi-Frequency) Technology as an alternative means of communication using Radio Frequency (RF) with advantages of simplicity and audibility. DTMF Technology has been used here to implement acoustic communication for controlling the angular position of the stepper motor remotely anywhere in the world through mobile phone network. The desired value of angular position signals, in terms of DTMF tones have been generated by using a mobile phone. The microcontroller has been used to implement the control algorithm after receiving the DTMF tone. Since no extra transmitting and receiving device is needed except mobile phone, the system is very much simple, rugged, and cost effective. The experimental results indicate that the system has high resolution, repeatability and error is also within tolerable limit.