Wheel Speed Measurement

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Loftie

Joined May 26, 2015
2
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
Loftie
 

pwdixon

Joined Oct 11, 2012
488
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.
 

Sensacell

Joined Jun 19, 2012
2,930
Agreed.
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.
 

DickCappels

Joined Aug 21, 2008
8,144
We are forbidden to discuss this on the website. Re-post this a third time and you will be suspended or banned.

Previous closed post:
http://forum.allaboutcircuits.com/threads/determining-wheel-speed.111720/

Welcome to the AAC forum.

The owners of All About Circuits have elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

This thread is against the AAC forum rules, Chapter 6, as seen here:

6. Restricted topics. The following topics are regularly raised and however are considered “off-topic” at all times and will results in Your thread being closed without question:

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  • Automotive modifications <= Your post falls in this category.
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Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

Please try to understand the reasons behind this action, and feel free to browse and use the forums.

You might find answers to your questions in one of these forums:

http://forum.allaboutcircuits.com/showthread.php?t=54400

Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good luck.
 
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