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LDR Lux measurement

  1. Aug 7, 2016 #1
    I have a micro-controller with 10 bit resolution. How can I convert the voltage or digital output of the microcontroller to a Lux reading ?
     
  2. jcsd
  3. Aug 7, 2016 #2
  4. Aug 7, 2016 #3
    I don't have a lux meter. I noticed proteus which is the software I use for simulation has one. What if I used that to find the relationship ?

    I used a circuit like this and measured the voltage
    luxMeasure.PNG

    This is the curve I got
    Curve.PNG

    So if I find the equation of this curve, then given a voltage I can get the LUX value ?
     
  5. Aug 9, 2016 #4
    Try to use a transimpedance Amplifier instead of voltage divider.
     
  6. Aug 9, 2016 #5
    What would be the benefit of using a transimpedance amplifier over the voltage divider ?, From what I've read, it converts current to voltage. I haven't studied this type of amplifier yet
     
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