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  • pwm
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Related

Reading PWM Signals With The Arduino

timswift
timswift over 9 years ago

How would i set about reading PWM signals with the Arduino

and converting them into a more easily used format (like a number from 0 to 180). 

 

Thanks

 

  Tim

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  • clem57
    clem57 over 9 years ago +1 suggested
    https://www.arduino.cc/en/Tutorial/PWM is how and quite easy to create a PWM. But you asked how to read. This is much harder since we have to talk about rising and falling edges. A good look is http:/…
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  • jc2048
    0 jc2048 over 9 years ago

    From pages 118-119 of ATmega328 datasheet:

     

    "16.6 Input Capture Unit

     

    The Timer/Counter incorporates an Input Capture unit that can capture external events and give them a time-stamp indicating time of occurence. The external signal indicating an event, or multiple events, can be applied via the ICP1 pin or alternatively, via the analog-comparator unit. The time-stamps can then be used to calculate frequency, duty-cycle, and other features of the signal applied."

     

    That's where I would start. Since the hardware side is sitting there for free (as part of the same module that does the PWM, if I'm understanding the datasheet correctly), why not use it? How easy it would be to use from the Arduino coding system I've got no idea - I've never used a Arduino, so someone else will have to comment about the practicality of setting it up and reading it.

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  • jc2048
    0 jc2048 over 9 years ago

    From pages 118-119 of ATmega328 datasheet:

     

    "16.6 Input Capture Unit

     

    The Timer/Counter incorporates an Input Capture unit that can capture external events and give them a time-stamp indicating time of occurence. The external signal indicating an event, or multiple events, can be applied via the ICP1 pin or alternatively, via the analog-comparator unit. The time-stamps can then be used to calculate frequency, duty-cycle, and other features of the signal applied."

     

    That's where I would start. Since the hardware side is sitting there for free (as part of the same module that does the PWM, if I'm understanding the datasheet correctly), why not use it? How easy it would be to use from the Arduino coding system I've got no idea - I've never used a Arduino, so someone else will have to comment about the practicality of setting it up and reading it.

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