Post by thread:[PIC]: 16F87x Servo Control with PWM

Donovan Parks wrote > > I'm looking for sample code on how to control a servo motor with the > built-in PWM pins on the 16F87x. I need to control two seperate servo's - > one with each PWM pin. The PicList Source Code section has some example on > how to set-up PWM for the 16F87x, but doesn't show how to use it once you > have it set up (ie. how to change the duty cycle, frequency, etc...). > Thanks for any help. > I believe you need to be state exactly what type of servo motor you require to control. If it is a Radio Control Model Servo Mechanism then you do not normally use the PWM facility on a PIC to achieve control. There should also be a great deal of information on controlling these mechanisms in the archives. So I must assume it is a different mechanism you are trying to control. Hence your need to specify exactly what type of mechanism you wish to control. Regards Chris Carr -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Hello Chris, I am looking to control a radio controlled servo (ie. the ones used in model airplanes). Why do you suggest instead of PWM? I'm hoping ot use PWM so that I don't need to process code to toggle a digital pin on and off in my code. > If it is a Radio Control Model Servo Mechanism then you do not normally use > the PWM facility on a PIC to achieve control. There should also be a great > deal of information on controlling these mechanisms in the archives. So I > must assume it is a different mechanism you are trying to control. > > Hence your need to specify exactly what type of mechanism you wish > to control. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

The usual method would be to bit-bash it by hand. On the '87x you could also use the compare module(s). Cheers, Bob Blick {Quote hidden}>I am looking to control a radio controlled servo (ie. the ones used in model >airplanes). Why do you suggest instead of PWM? I'm hoping ot use PWM so >that I don't need to process code to toggle a digital pin on and off in my >code. > >> If it is a Radio Control Model Servo Mechanism then you do not normally >use >> the PWM facility on a PIC to achieve control. There should also be a great >> deal of information on controlling these mechanisms in the archives. So I >> must assume it is a different mechanism you are trying to control. >> >> Hence your need to specify exactly what type of mechanism you wish >> to control. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

>I am looking to control a radio controlled servo (ie. the ones used in >model >airplanes). Why do you suggest instead of PWM? I'm hoping ot use PWM so >that I don't need to process code to toggle a digital pin on and off in my >code. Search the PICLIST archives.. there must be dozens of examples there as well as around the internet. _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads