This project is used to control 3 servo motors and 2 DC motors on a mobile platform. It needs to be controll in two modes. One is using a mobile phone on the robot which receives commands through DTMF tones from another mobile phone. The second one is from a computer. here using the same DTMF tone decoding circuit to control using the computer. try to use serial port for send a byte to a micro controller. Then generate DTMF tone using DTMF encoder . Then transmit the tone wirelessly. then decode these received DTMF signal , fix some command for each type of DTMF dial tones to perform robotic action