Hello James,

They would kill me if I posted pics of a bird here..<g>. I would be more than happy to email pics. But when I get my project done on the PIC, I will post the code and schematic for everyone.

Dwayne

I am using a inductor type system to monitor the RPM. I have found that just 1 turn of wire around the spark wire is more than 50 volts!!

So, what I did, was put a 5V zenor to the base of a PNP, and let the PNP be the trigger to my PIC. Using Pulsein, I count the time between off and on, and for 1000 hz, I get about 960 on my Pulsein calculation. From there I calculate the RPM's via the value of the Pulsein measurement. At the higher RPM, lets say 2000 the value changes to 480, and 4000 RPM the value changes to 240. The higher RPM I loose accuracy, but I could care a less on 50 RPM or so. My Max RPM is about 6200 RPM (Can go to 6600, but it would have to be without the prop). At 8000 RPM, the Value is 120... Thus you have 120 values that represent 4000 RPM (at Highest speed) 4000/120 = 33 RPM per increment...

Dwayne