Seth King

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8 years ago.

Halls effects and interrupts

I need to read the status of all three hall effect sensors whenever I see a transition(both rise and fall). I have tried various methods with InterruptIn but none of them seems to match the results that I am expect from looking at a scope. I have seen some older posts that read doesn't work with InterruptIn but they are pretty out of date.

I could just spawn a thread that reads(DigitalIn) them as fast as possible manually not worry about the interrupts at all.

Does any one have a good experience/method for read IO reliable?

Thanks, Seth

What kind of timing accuracy do you require?

posted by Erik - 14 Dec 2016

I think I got 40ms period on the halls, but that could get shorter as the wheel goes faster. Right now I am not sure I am getting even correct results.

posted by Seth King 14 Dec 2016

At such speeds InterruptIn should be more than fast enough. Can you show your relevant code (between <<code>> and <</code>> on seperate lines), the wrong result you get and what you expect from your scope?

posted by Erik - 15 Dec 2016
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