guys, I need your help...actually i have build a robotic arm using 2 stepper motors and it is programmed using at89s52 microcontroller...uptil now the arm is working properly..but now i want to control this micrcontroller using rf module which in turn will control the stepper motors...so which ic and what type of rf module should i use and also please suggest me a little bit algorithm that could be useful for me to program th mc....THANK YOU