Alpha clock 5: adding a photo resistor

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  • August 3, 2013 at 6:20 pm #20245
    jankoen
    Participant

    Hi


    This is my first Arduino based project I’m doing. I’m a very experienced programmer but a lousy electronics engineer.

    My idea is to add a photo resistor to the clock so the brightness gets adjusted to actual amount of ambient light.

    My question is: Is it as simple is this ?

    Add a photo resistor like this to PA5 or PA7 with the following schematic:
    

    

    
PhotoR     10K
    
+5      o---///--.--///---o GND
    
|
    
Pin PA5 o

    


    


    ( found on http://playground.arduino.cc/Learning/PhotoResistor )

    And than read it with analogRead(4) or analogRead(6) in the code ?


    Thanks for any help,
    Jankoen

    August 5, 2013 at 1:16 am #21406
    Windell Oskay
    Keymaster

    This sounds mostly correct, but I think that PA5 is mapped to Analog 5.

    Those analog pins were left open specifically so that you can do projects like these; it sounds like a fine approach.
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