[FlashStopFall]

So I’m ready to start testing the MPiG thing I made. I hooked it up and got an injector open duration, but only about half the time, and only when idling, not when changing rpm’s. I bought a cheap oscilloscope and found out the waveform looks like this (image attached). I think that first; I have it programmed to read low to high which is backwards but more importantly; I think the voltage spike coming from the injector coil field collapsing is messing up my readings. My wiring is just like in the mpguino schematic, but with different resistors to get me down to around 3 volts. I’d slap a diode on there but I’ve read that can make the injector stay open too long. Do you guys have any ideas for either 1: hardware to get rid of the spike or 2: programming to read it better? Or would you mind explaining how the mpguino does it?

Upon further inspection, that signal is actually 14v, and isn’t being dropped down to 3v, yikes! So that’s problem #1, but I think my other two problems still exist.