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Is it possible to detect a yellow led?

Discussion in 'General Electronics Chat' started by Pablosan, Mar 19, 2012.

  1. Pablosan

    Thread Starter New Member

    Mar 18, 2012
    I need to detect a device in my car. It has audible tones that I am building a lm567 circuit for now. However the same trigger can be achieved if I could find a way to detect that little yellow led with the same accuracy. ONLY the yellow led, not the green red or anything else, without obstructing it and must be VERY reliable.

    Can it be done inexpensively?

  2. Will D

    New Member

    Mar 19, 2012
    Hi Pablosan
    You can use optical detector for detecting yellow led.
  3. Pablosan

    Thread Starter New Member

    Mar 18, 2012
    Thanks. I was looking for an inexpensive solution to detect the exact wavelength of my yellow led ONLY. Not all the ambient light. I found this cell phone spectrometerhttp://www.asdlib.org/onlineArticles/elabware/Scheeline_Kelly_Spectrophotometer/index.html
    about the same as photoshop I think.

    May not be accurate enough....

    I was looking to build something like this http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&ved=0CHgQFjAI&url=http%3A%2F%2Fwww.first-sensor.com%2Fsites%2Fwww.first-sensor.com%2Ffiles%2Fdownloads%2Freferencesolutions%2Fentwicklungsmodule%2Fws756pcba2_500008.pdf&ei=EFdnT-WGMuPZiQLVl5SjDw&usg=AFQjCNGezdbNJ76OFVMWBsk8q_E0-wi3pQ&sig2=XxhFX2Pw9pevcwuNC41Fww
    Last edited: Mar 19, 2012
  4. vpoko

    Active Member

    Jan 5, 2012
  5. KJ6EAD

    AAC Fanatic!

    Apr 30, 2011
    Are you trying to detect the indications from a concealed remotely mounted radar detector?
  6. Pablosan

    Thread Starter New Member

    Mar 18, 2012
    Same idea ! Its for a Ignition interlock device.

    I can't hear the tones with the stereo on and the led is anything but attention grabbing.

    Its actually dangerous because I'm ALWAYS taking my eyes off the road to check if its yellow not green and you can't hear it.