Maybe I'm just going about this the wrong way?
I'm using a 16C63 and 10ms sample time for the sensor.
I'm using a Variable Reluctance Sensor with its output tied thru
a National LM2907 Frequency to Voltage Converter. The LM2907
will convert sensor output to a square wave at a steady dc voltage,
but the problem I'm having (I think) is the LM2907's output,
low out min. = 25% of supply current
high out max = 75% of supply current
The way I see it is this is producing;
5vdc supply current=
PWM output from LM2907
9ms period 30% duty cycle, peak=3.75vdc, low=1.25vdc
= aprx. 2vdc steady. This is of coarse very or too close to what I
figure the 16C63 will see it's pin state, I figure right around 1.3vdc
where the 16C63 will see changed state. Square wave looks clean
and works until I exceed 100hz. Uping supply current is possible
but then raises the low to high.
Sensor output in the 1vac/200hz (0-2vac/0-400hz) range.
I'm SURE there is a easier way to convert the sensors signal, I do
not have to use the LM2907. If someone could point me in a
direction to get me off this hamster wheel I would be indebted.






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