>I'm not generating servo control pulses. I am measuring their width and >converting that measurement to a value to be used in PWM speed control of a >DC brush motor. You are making what they call in the R/C world an "Electronic Speed Control" or "ESC." I sell them. Have any questions other than "how" that you need answered? FWIW, I think controlling 2 motors with any kind of linearity based upon 2 inputs is asking for a lot of extra work, if everything is done in software. You really want to have 2 12C508's and do it that way. It's cheaper too. Andy ================================================================== Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 Hardware & Software for Industry & R/C Hobbies "Go fast, turn right, and keep the wet side down!" ==================================================================