Testing the v3.3 units purchased recently (#316, #317, #328 & #360) with this: http://www.mmcompsys.com/download_zone/6_sensors/SEN.pdf Magnetti Marelli sensor - which is a common sensor used by the likes of Omex and MM themselves. Its resistance was measured at ~620 Ohms.
- A scope trace shows a good AC signal ~(+/-10V)
- measure the input signal mean value, in DC setting. Eg. if the signal just slighly goes under 0V (eg. minimum is -20mV) for some reason, this is valid behaviour. A scope in AC mode does not show this.
- same config (from MembersPage/JimW/ExampleConfig ).
- please issue the (Man) mdv, mdV, mcd and mct for each and save the result, and publish. Very important to see the config that was actually read back
- all have been loaded with firmware v1.0.23 and the
- verify firmware integrity (eg. prog.pl without "w" option) for each
- if you unclamp any
- check resistor ad LM1815 pin7 (first check that it exists, than maybe measure resistance, should be 100..180k)
- with scope, measure on LM1815pin3 and LM1815pin12. DC mode is needed to see if signal goes below GND
- check LM1815pin5: (the 3-pad SMD jumper) isn't it connected (solderblob) to either GND or +5V ? It shouldn't, and it's unlikely to explain anyway.
- don't clamp it unless the problem has been identified and fixed
- #316 (primary&secondary VR) and #328 (VR primary/Hall Secondary) read the engine speed perfectly
- #317 & #360 show no engine speed
- there has never been a problem with primary trigger with assembled controllers earlier (they get tested, with appr +-5V signal, lower than yours), so 2 out of 4 is extremely surprising, suggests another round of careful testing and reporting details.
- publish a few seconds of the serial-output after Man mdf01 mdkff when the trigger signal is applied. This reveals if the trigger gets input.