GenBoard/Manual/InputTriggerHardWare (2005-03-27 23:31:59)

The trigger hardware is not particularly complex, but there are some options and things that shouldn't be missed

The trigger signals are sensitive. Especially the VR signal at low-RPM.

The following precautions must be applied:

Primary trigger (trigg1)

For Hall setup:

Adaptive hysteresis: for use with VR sensor (LM1815 involved)


setting up VR on v3.2 - most parts are soldered. Still check at least the SJ6 and R30.

The reason for the 2 missing bits: other option would be HALL type: therefore this is only done before shipping when the user declares (eg. on project wiki page, or order note, preferrably both) that he needs VR type.

The 3x2 pinheader is between the EC36 and the LM1815.

Make sure you view the board in a good orientation, so econoseal points down and "Top" or "Bottom" text is readable.

setting up HALL on v3.2

trigger #1:

trigger #2:


Special setup: when input does not go below 0V

You only need a C88=10uF (1210, 35V) when the signal otherwise does not go below zero. SJ1 must not be shorted in this case.

Useful, for example when stealing the 0.65V based VR signal of an alien ECM (as on MembersPage/Gabor).

Note that R30 pullup resistor is not recommended for VR sensor. If you already have an R30 pullup, that produces an offset (as a voltage divider with the VR sensor's internal resistance) and make the input NOT go below 0V at low RPM (cranking): fix it by removing R30 or following this section ( apply C88=10uF and not short SJ1).


Secondary trigger (Trigg2):

For Hall setup: R91 10k, SJ5, (SJ10 or C89)
For use with LM1815: U12, R58, R59, R89, R90, R91, C32, C33, C34, C40, D24, D27, SJ7 & SJ10 (shorted)
V3.2, Solder the LM1815 + SJ7 for VR setup, only SJ5 for Hall

See also