RE: RPM sensor
My turbines are working so far (still need to test out the new ECU)!
Actually I am trying to prototype up a flameout alert circuit. I was thinking of tapping into the rpm signal if it was big enough to discern without extra amplification needed.
If its sinusoidal, I can most likely bring it into an analog pin and chop it with a comparator. What voltage levels do you see?
I am assuming the rpm sensor picks up one rotation of the entire wheel or are there more than one pulse per revolution?
I only need to know rough rpm, figuring 150k rpm is about a 2400Hz sine wave each rotation. That is doable to measure accurately but I am not sure if there are any other scalars for converting frequency from the sensor to actual rpm.