Remote control of stepper motors over telephone lines

In this study, stepper motor was controlled over telephone lines. DTMF technique was used for remote control. The application consists of two sections. In the first section DTMF decoder circuit identifies the key signals of the phone and genaretes 4 bit equivalent of these signals. In the second section a stepper motor was controlled via PIC microcontroller. The PIC microcontroller uses 4 bit inputs to control. As a result a stepper motor was controlled by PIC microcontroller. The stepper motors have many features like ease of control. The study was designed to be used in the unsafe fields of the human life.