Connect with us

dim led w photo resistor?

Discussion in 'LEDs and Optoelectronics' started by SD5, Mar 13, 2016.

Scroll to continue with content
  1. SD5

    SD5

    2
    0
    Mar 13, 2016
    Why when I shine my light on the photo resistor the led doesn't go totally dark? It goes dim, but not completly off..
     
  2. Minder

    Minder

    3,101
    664
    Apr 24, 2015
    Because the P.C. still has resistance, just increases with light.
    M.
     
    SD5 likes this.
  3. SD5

    SD5

    2
    0
    Mar 13, 2016
    Is there way to up or down size anything to make this more sensitive?
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,642
    2,690
    Nov 17, 2011
    You'll need an amplifier to convert the weak signal from teh photoresistor to a suitable current for the LED. See for example this one.
     
    hevans1944 and SD5 like this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-