Post by thread:Car tacho

Hi all, Can anyone give me any information on connecting the ignition coil of a car to a PIC input for the purposes of a tachometer. Cheers Mike spam_OUTmen5m3bTakeThisOuTelecteng.leeds.ac.uk

Mike wrote: >Hi all, >Can anyone give me any information on connecting the ignition coil of >a car to a PIC input for the purposes of a tachometer. >Cheers >Mike >.....men5m3bKILLspam@spam@electeng.leeds.ac.uk Use a circuit something like this: 1N4007 diode Ign coil input side (low tension) + ---------->I---------/\/\/\/\---------------------------- PIC or Monostable __I__/ / /\ 5v z ener I ____________________I____________ negative of both car and PIC circiut ////// You may want to use a monostable as the input will have a lot of RF ringing on it. Robert

Mike wrote: >Hi all, >Can anyone give me any information on connecting the ignition coil of >a car to a PIC input for the purposes of a tachometer. >Cheers >Mike >men5m3bKILLspamelecteng.leeds.ac.uk Use a circuit something like this: 1N4007 diode Ign coil input side (low tension) + ---------->I---------/\/\/\/\---------------------------- PIC or Monostable __I__/ / /\ 5v z ener I ____________________I____________ negative of both car and PIC circiut ////// You may want to use a monostable as the input will have a lot of RF ringing on it. Robert

I have a circuit for an interface if you like. It is in gif format. Regards Tony PicNPoke Multimedia 16F84 Beginners PIC Tools. **PLUS** - PicNPlay - PicNPlan - PicNPrep - PicNPost PicNPort - DT Type Saver - *new* PicNQuiz. Recent addition - DogBoneZ Component. http://www.dontronics.com/picnpoke.html

On 04/01/98 09:08:38 you wrote: > >I have a circuit for an interface if you like. It is in gif format. > > >Regards > >Tony > > >PicNPoke Multimedia 16F84 Beginners PIC Tools. > >**PLUS** - PicNPlay - PicNPlan - PicNPrep - PicNPost >PicNPort - DT Type Saver - *new* PicNQuiz. >Recent addition - DogBoneZ Component. > >http://www.dontronics.com/picnpoke.html > > Deja vu...all over again... :) Good Scematics! Allen

G'day Tony, >I have a circuit for an interface if you like. It is in gif format. I'd be interested as well.. I'm tinkering with some RPM activated switch PIC applications.. I'm wondering if a conventional tacho pickup will deal with a capacitive discharge ignition (Where 500+v is applied to the coil primary) that a lot of high performance cars use, rather than just the usual switch the negative of the coil with the + at 12v type ignition (deceleration) type.. --- Brett Paulin : Trance DJ Spock, Electronic Engineer & Gyrocopter Pilot For DAT trading, DJ Spock & Techno Magic - http://home.mira.net/~rando THINK for yourself, QUESTION Authority - ICQ Id# 5879520