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Reflective vs Direct Optical Sensing (Part II)

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by dkw, Jul 25, 2017.

  1. dkw

    dkw New Member

    Nov 8, 2012
    A follow on to an old discussion here. I have two separate working circuits - one for reflective sensing indoors and another direct sensing (using sunlight) outdoors. I would like to have one circuit which varies resistance based on the amount of light present. For now, I'm trying to accomplish this manually changing resistor values but can't get enough variability using either of the circuits as the base.

    Here are the two circuits

    Reflective Sensing Circuit

    Direct Sensing Circuit

    I would greatly appreciate any thoughts on a combined circuit that could vary resistance sufficiently for both environments.

    Thanks in advance!

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