Originally Posted by
Painless
Today hasn't been a very good day, after spending the past days working on code to read pulse widths and translate them into frequency and duty cycle I hit a wall today when trying to interface with my truck.
The wires to the fuel injector are reported by my multimeter to be operating at a hz rate which is what I would expect in relation to RPM, however, the meter reports 99% to 100% duty cycle which is obviously false for one injector.
I went ahead and interfaced to my microcontroller and wrote some code to analyse the signal and feed back to a laptop, however, from all points it appears to the microcontroller as if the pulse never stops.
I suppose I will think on this tonight and try again tomorrow. What I really need is a proper oscilloscope to analyse the signals going to the fuel injector, but they are effing expensive and my PC based scope just doesn't seem to be cutting it.
Russ.