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History of MembersPage/MattiasSandgren/SfiftyBthirty
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2015-09-18 19:17:25 . . . . MembersPage/MattiasSandgren [Forgot +5V pull-up on SDA input]
2015-09-18 10:30:33 . . . . 195-240-176-40.ip.telfort.nl [provided hints after review of triggerlog]
2015-09-18 08:00:16 . . . . 84-225-254-62.static.virginm.net [Adjacent trigger tooth being picked up]
2015-09-18 07:51:14 . . . . MembersPage/MattiasSandgren [BMW S50B30 third trigger angle erratic?]
2015-09-18 07:35:18 . . . . MembersPage/MattiasSandgren [BMW S50B30 third trigger angle erratic?]

Changes by last author:

Changed:
It's not clear to me, but but it could be false triggering (noise) on third trigger input? I may hook up my Rigol scope and check it out. SDA input has 10k resistor in-line, 10nF towards ground and 1N4007 diode for protection.
It's not clear to me, but but it could be false triggering (noise) on third trigger input? I may hook up my Rigol scope and check it out. SDA input has 10k resistor in-line, 10nF towards ground and 1N4007 diode for protection.

FIXED Internal 54 kOhm pull-up inside CPU on SDA pin is not enough (naturally), now mounted 2.4 kOhm pull-up to +5 Volt inside ECU before 10k protection resistor.

Added:
Added:
Fixed the missing/weak pull-up on (SDA) trigger input.

sda-pull-up-fixed.png

Added:
** Not it was not present, thanks Dave - that fixed the issue!

** Voltage on trigger input pin at sensor connector measured 4.96 Volts to signal ground, but was weak. Shorted with 2.4k and got only 220 mV voltage drop over it...