3 phase sequencing


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  1. #4
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    Dec 2005
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    Using Interrupt On Change you'll get an interrupt every 3.33mS. I think all you need to do is check the pin number and polarity of the interrupt (rising/falling) for the sequence and reset a timer set to overflow at ~3.5mS. If the timer overflows, you're missing a phase.

    Of course, you already know you can connect the phases through current limiting resistors as shown in Microchip's AN236.

    If you output A, B, or C for a rising edges and a, b or c for falling edges you should see ABCabcABCabc...
    Last edited by dhouston; - 25th May 2007 at 11:40.

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