night199uk - continuing to add my engine to my ...
continuing to add my engine to my HALMET for monitoring.
i'm trying to get the digital inputs working for the overtemp alarm, oil pressure alarm and sail drive seal alarm.
i wire those alarm wires up to the HALMET simplistically. when i put a voltmeter on e.g. the oil pressure alarm i see ~10.5v when it's lit, and ~0-1v when it's unlit.
when I put those wires onto the HALMET d2 input:
originally i was getting intermittent on / off alarms, randomly. i assumed this was because i needed to enable the pull down resistor; so i soldered/shorted the pull down.
now, the d2 input doesn't seem to go "up" even when there is 10.5v across the input.
what am I missing?
3 Replies
I've not tried that but i thought if i light was in the circuit and you have connect between that light and the ground that no pull up/pull down is required. So your first setup I would have said was correct. That small voltage could be enough to trigger it, it's something like 1.5v I think. Are they LEDs or bulbs in your engine panel?
not sure. it's a standard yanmar "C" type panel, i think. i need to play with it a bit more.
i built a "passthrough" harness that i can plug inline with the regular harness connectors. then i can cut & tap each line of the harness to break it out.
using this as a spec.