360k+
Serious Thumper
Offline
Savage heart of darkness
Posts: 680
Cartersville, GA
Gender:
|
Ahhh, I am detecting another engineer pod here. Ignition coils actually tend to act like flybacks, thus producing a duration period for the spark. I thot I had another picture that showed more than one coil pulse at speed, but I guess my camera decided not to take the pic (remember the days when WE HUMANS decided? LOL)
Anyway, the rotor coil has a nice consistent wave form as I suspected. I was planning on rectifying the pulse, disregarding the negative side (magnet leaving coil proximity), then buffering and clipping to a square wave and feeding to an MPU.
I'm not sure about the output yet, and wanted to get some feedback here on the forum. One idea I had was to use a 2 digit LED display showing the 1000's and 100's of RPM, discarding the 10's and ones. If that much resolution is not needed, a bar graph LED array might even work, and would give you resolution to the nearest 1000 RPM. The display should probably be something that can be grasped in a glance without having to think. Hopefully, some other ideas will surface.
BTW, I am a retired engineer (Apple - 20 years).
|