MembersPage/EricN/Trigger (2006-04-02 07:40:45)

Trigger related page for MembersPage/EricN

MembersPage/EricN/Trigger/Optical

MembersPage/EricN/Trigger/Vr

truck is a 6 cyl. I am firing cop coils and using a distributer mounted 24-1 trigger wheel

Board is a v3.2 serial number=110


Mar 31 06

Trying an optical trigger now => this requires the controller primary trigger set up for HALL

Have some questions. Went to the local electronics store and picked up an OPB804 optical switch. Built it into this little circuit that I found on the internet

opticaltrigger.JPG since I have no idea how to do it myself. It works fine on the bench, low reads .27v to gnd when the beam is not blocked and high is 5.09v to ground with the beam blocked. Hook it up to my v3.2 and I get from 3.6v to 4.6v => this confirms the agressive primary-trigger pullup inside your controller

I have a feeling the 10k resister needs to go and I just spent all that time building, mounting and sealing it for nothing and need to throw it out and start again, anyone please confirm??

  • I bought another one and tried without the 10k resistor (=> only the pullup in the controller), makes no difference at all (voltage readings ? Is that still exactly 3.6V or now goes lower ?). Signal doesn't go low enough no matter what. If I disconnect the signal wire only and tap the bare wire together, I can get rpm readings.
Any help greatly appreciated, would like to drive the truck again.

BELOW THIS WILL BE SCRAPPED IF OPTICAL TRIGGER WORKS.