Wheel Speed Measurement

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Thread Starter


Joined May 26, 2015
Good day

I want to measure wheel speed by using a variable reluctant sensor with a sprocket to determine the speed of a wheel and then convert the frequency to a voltage using a LM2907/LM2917 IC. Then I want to feed this voltages into the 5 V input of my arduino. Any tips on how to approach this problem? The max RPM of the sprocket will be no more than 2000 RPM. Using a 60 teeth sprocket which means that the max frequency should be 2 kHz. I know by using a variable reluctant sensor, signal conditioning is necessary.I just want to know how to measure it and if what I'm doing is the right approach.

Kind Regards


Joined Oct 11, 2012
Converting to an analogue voltage is bound to reduce your accuracy, it would be better to measure the frequency directly and skip the f/a conversion.


Joined Jun 19, 2012
Just get a digital signal out of your transducer and feed it into an IO pin.
Use the counter / timers to calculate the speed.
Simple and accurate.


Joined Aug 21, 2008
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