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axelsaff
axelsaff
Associate
February 25, 2014
Question

LDR example

  • February 25, 2014
  • 6 replies
  • 1640 views
Posted on February 25, 2014 at 20:36

Hello,i'm a beginner in STM32 can someone give me an example of how to use the LDR with STM32F1.

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    6 replies

    waclawek.jan
    waclawek.jan
    Super User
    February 25, 2014
    Posted on February 25, 2014 at 20:53

    What is LDR?

    JW
    Tesla DeLorean
    Tesla DeLorean
    Guru
    February 25, 2014
    Posted on February 25, 2014 at 21:08

    Light Dependent Resistor

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    Andrew Neil
    Andrew Neil
    Super User
    February 26, 2014
    Posted on February 26, 2014 at 01:13

    ''i'm a beginner in STM32''

    Do you have any experience with any other microcontroller(s)?

    Do you understand basic electronics?

    ''can someone give me an example of how to use the LDR with STM32F1''

    Have you looked at the examples included with the Standard Peripheral Library?

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    waclawek.jan
    waclawek.jan
    Super User
    February 26, 2014
    Posted on February 26, 2014 at 09:56

    > Light Dependent Resistor

    Ah thanks. So this is how photoresistors are called these days... :) One learns something new every day.

    Quick googling revealed that there is some - as you say - LDR on some of the EVAL boards, e.g. http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1199/PF259717 , so I guess the accompanying software might contain some examples...

    JW

    chen
    chen
    Associate II
    February 26, 2014
    Posted on February 26, 2014 at 10:58

    Hi

    Follow what Jan says. I just wanted to add that you need to study the circuit for the LDR from the demo project, this is NOT just software!

    I guess the LDR is being used in a resistor divider.

    What are you trying to do? Just detect light/no light OR

    Read the amount of light?

    The former is quite easy - look up 'threshold'

    The latter is a lot harder. You need to understand the LDR characteristics, where the linear region is.

    axelsaff
    axelsaffAuthor
    Associate
    November 24, 2014
    Posted on November 24, 2014 at 19:42

    Thanks for your replies,i did like you said i had a long time reading the manuals and now i got a working program,thanks again.

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