PIC12F675 Low

Discussion in 'The Projects Forum' started by RodneyB, Aug 27, 2013.

  1. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
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    I am building a circuit using a PIC12F675. The supply voltage is 4.9Volts. I need the voltage to go low as part of the circuit. I have used an LDR and a 33K resistor, The voltage drops to 3.4 Volts. Is this considered as a "LOW" in terms of an input for a PIC.

    My circuit does not seem to be seeing it as a low.

    any thanks

    Rodney
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    No, a PIC requires close to zero volts as a logic low. You probably will need a pull-down resistor; post a schematic.
     
  3. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
    633
    13
    I have retested and the voltage does not go below 3.6 Volts. If I was to remove the 33k Resistor would the current flow through the LDR not damage it.
     
  4. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
    1,758
    98
    You need to connect the LDR to an analog input and calculate the light level. It's not a digital device.
     
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