Hi, Interesting how is that two request came together for the same thing. Futaba servos recieve a PWM signal to control the servo position. Pulse duration is from 1mSec to 2mSec. If the servo goes from 0 degrees to 90 degrees then 1mSec pulse will put it in 0 degrees and 2mSec will put it in 90 degrees. I use retract servos that goes from 0 degrees to 180 degrees and the same goes there (1mSec to 2mSec pulse). For all middle positions use a pulse between 1mSec to 2mSec. This pulse should be sent to the servo motor every 10mSec. Chaipi \\\|/// \\ ~ ~ // ( @ @ ) ----------------------------oOOo-(_)-oOOo-------------------------------------- ! ! ! Chaipi Wijnbergen ! ! Electronics/Computer Eng. M.Sc. Tel : +972-8-9343079 ! ! Optical Imaging Laboratory Fax : +972-8-9344129 ! ! Brain Research Center Email : chaipi@tohu0.weizmann.ac.il ! ! Weizmann Institute of Science URL : http://www.weizmann.ac.il/~chaipi ! ! Rehovot 76100 ISRAEL IPhone : chaipi ! ! ! ------------------------------------Oooo.-------------------------------------- .oooO ( ) ( ) ) / \ ( (_/ \_) On Thu, 31 Jul 1997, Sean Breheny wrote: > Hello all, > > I am trying to find out the specs on the servo control signal for radio > control servos (i.e. futaba servos for RC aircraft). I need to know how long > a pulse is for > neutral position, how long for each extreme of throw, what the pulse > frequency is, and what the voltage is. I am considering making several > PIC-based RC related projects, including a signal loss detector, autopilot, > and maneuver record/playback > device. > > Thanks, > Sean >