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1  Topics / Science and Measurement / Re: Frequency Counter Library on: December 01, 2012, 04:44:22 pm
Been using the Frequency Measurement Library, it's great. Been using it to measure the speed and RPM on my car. Is there a way of measuring 0 frequency to show 0 speed or 0 RPM at all?


Just as a heads up, if you are getting your signal from a hall effect sensor you should be able to read zero speed, but from what I have been looking up, most speed sensors are a much cheaper variable reluctance sensor. As I understand it, variable reluctance (VR) sensors do not do well at slow speeds. This code and my VR sensor off of a Borg-Warner T5, for a S-10, cannot go down to 0 rpm. I can only get to 10s or rpm. Hall effect sensor can take true zero speed measurements. Good luck.
2  Topics / Science and Measurement / Re: Frequency Counter Library on: November 14, 2012, 11:36:33 pm
I am new to the site, but I have been programming micros and Arduino for a little time now. I like the code and it works great. I am using it with a variable reluctance sensor and some support circuitry. I wanted to use you code and take the frequency value and output an analog signal in a ratio of the frequency. For example I take the frq from the example and ledBrightness=map(frq,0,fastestFrequency,0,255) but i cannot seem to get a signal out with the analogWrite() command. Does this library mess with the timer that controls the PWM timing of the analogWrite() command?
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