that reminds me, optoisolators are your friend :) justin Thomas McGahee wrote: >Did a project about 5 years ago using a 68HC11 as the processor for >a datalogger on a racing motorcycle. We ended up using fiber optic >cable to connect sensors to the main unit. Much more expensive >than wire, but it eliminated the noise pickup problems from the >magneto. > >If you use wire, remember that every wire wants to act like >an antenna. Use lots of bypassing, and toroid chokes when necessary. >Don't skimp on the noise reduction or you'll kick yourself >every time your unit gets the hiccups and goes crazy. > >Fr. Thomas McGahee > > > > > >----- Original Message ----- >From: "michael brown" >To: >Sent: Thursday, March 28, 2002 6:37 PM >Subject: Re: [PIC]: Noise and PIC's > > >>>We use PICs in automotive applications and there is no problems at all. >>>Check your power supply and your board layout. >>>Best regards >>> >>Tsvetan, >> >>He is using a magneto in place of an ordinary ignition coil. This is the >>worst possible environment for electronics. I can't think of anything >> >that > >>is comparable that would be used in a car. >> >>David, >> >>You are probably going to end up having to completely seal the PIC and >>associated circuitry inside a Faraday shield of some sort. Then use >> >RG-174 > >>or some kind of small coaxial (or otherwise sufficiently shielded) cable >> >to > >>connect to external devices. I would suggest using a completely separate >>power supply (such as a battery sealed up with the circuit board). This >> >all > >>may be a little bit overkill, but I have seen (or is that received) >> >magnetos > >>before, and I bet your not running any audio equipment (radio's, tape >> >decks, > >>amps, speakers) in this application. To sum it up (especially since I'm a >>ham), I'd be pissed if my neighbor had a magneto in his car. ;-) Good >>luck, you're gonna need it. >> >>BTW, I'd forget about trying to shield the magneto or wires, as this is >>apparantly a "performance" application. Race car drivers will never >>compromise. If they *think* that the shielding on ther "mag" or plug >> >wires > >>is somehow affecting the performance, it'll be removed quickly. >> >>michael brown >> >>-- >>http://www.piclist.com hint: PICList Posts must start with ONE topic: >>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads >> >> > >-- >http://www.piclist.com hint: PICList Posts must start with ONE topic: >[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics