I was working on a MDA video card with a pic ... you could probably use the external interrupt on the pics to synchronize. Then you could make one of them the "master" and all the others interrupt on the master's rising edge PWM output and output they're pulse for whatever width is programmed in software or whatever. It worked ok for my HSync and VSync signals ... It's an idea anyway ... MJ Brush ----- Original Message ----- From: "Willy Gooris" To: Sent: Wednesday, May 19, 2004 12:40 PM Subject: Re: [EE:] pic: Roman Blacks Linistepper stepper motor controller I wonder why an where they have to be synchronized? The pulswide is different most of the time. Is it than the frequencie that has to be synchronized? Willy -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Samuel BOUQUET Sent: woensdag 19 mei 2004 18:14 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE:] pic: Roman Blacks Linistepper stepper motor controller The problem is that you have to "synchronize" all the PWM! -----Message d'origine----- De : pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] De la part de Willy Gooris Envoyi : mercredi 19 mai 2004 17:36 @ : PICLIST@MITVMA.MIT.EDU Objet : [PICLIST] pic: Roman Blacks Linistepper stepper motor controller To all, but specially to Roman Black. I found this list by looking for a "stepper motor controller" and I am also beginning with pic micro chips. I read the spec's about "Roman Blacks Linistepper stepper motor controller". It makes use of power transistors in the output stage. It was readings somewhere that they are running hot. Question: Is it not possible to put 4 pwm devices in the place of the end transistors. These PWM devises could be 4 pics with a PWM output and a MOSFET. This may be simplistic, but ........ Is there somebody that has done this? Or is this to difficult to do? How would you do it. Thanks, Willy -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body