The radio output of an RC receiver is a pulse. The width of that pulse determines the servo position. The accuracy and repeatability as well as the output power are reflected in the price of the servo. You can either work from that pulse OR use a high quality servo of your choice to turn a knob. Most of that kind of setups balance a bridge. The chips in the servos have all been unobtainable by me! Good luck... John Ferrell W8CCW "Life is easier if you learn to plow around the stumps" http://DixieNC.US ----- Original Message ----- From: "Bob J." To: "Microcontroller discussion list - Public." Sent: Friday, May 04, 2007 9:17 PM Subject: [PIC] r/c receiver interfacing >I am looking to build what is essentially an a huge radio-controlled servo > with a stepper motor. In order to drive the stepper motor, I have to > convert the r/c receiver's pulses into step/direction pulses. To my great > surprise I googled for something off-the-shelf to do this, but have come > up > empty-handed. Has anyone done this sort of thing? > > Regards, > Bob > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist