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jfaycel
jfaycel
Associate
June 3, 2013
Question

LDR-Light Dependent Resistor and STM32Discovery

  • June 3, 2013
  • 3 replies
  • 1138 views
Posted on June 03, 2013 at 20:11

i want to drive a motor for a control of the door  following the LDR sensor signal 

( open when it feel light and close it when it's darkness)

I have an STM32F100RB. please i need your help urgently 

thanks a lot
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    3 replies

    crt2
    crt2
    Visitor II
    June 4, 2013
    Posted on June 04, 2013 at 11:08

    You need help with what?

    jfaycel
    jfaycelAuthor
    Associate
    June 4, 2013
    Posted on June 04, 2013 at 21:20

    i need to know how to program the LDR in STM32

    Tesla DeLorean
    Tesla DeLorean
    Guru
    June 4, 2013
    Posted on June 04, 2013 at 21:38

    You really need to work on your own Master's project.

    You'd presumably want to be using an ADC, and place the LDR (VT9ON1) in a resistor divider, perhaps with an 8.2K to VDDA. You'd then use the ADC to measure a voltage at the junction. The firmware library has ADC examples, you'll need to correlate the voltage to light intensity.
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