PIC to recognise button press when 2.5V seen at input pin? (ie neither high nor low)

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  1. - 12th May 2010, 21:34 #1
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    HankMcSpank
    HankMcSpank is offline Senior Member
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    Quote Originally Posted by mackrackit View Post
    MCLR pins are INPUTS only when set to off.
    From the data sheet.
    Many thanks ...useful things datasheets eh?! (but a bit scarey for n00bs!)
  2. - 12th May 2010, 21:43 #2
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    mackrackit
    mackrackit is offline SuperMod
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    Just keep the data sheets in the bathroom and read them there...
    Somehow they are not so ... intimidating then.Name: pen_mac.jpeg Views: 845 Size: 1.9 KB
    Dave
    Always wear safety glasses while programming.
  3. - 14th May 2010, 04:21 #3
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    Default 2V5 input with digital I/O pins

    2V5 is in the analog world so if you have a spare comparator or ADC pin on your PIC then use it.

    If you do not have a spare analog pin, then RCTIME and POT commands can be used.

    Setup your PIC with a fixed resistor and capacitor for RCTIME or POT on an available digital I/O pin. Connect the 2V5 source to the same pin through, say, a 10K resistor. There will be large changes in the value returned by the RCTIME or POT command when the 2V5 source is present/not present.

    HTH
    BrianT
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