Sound, Light/Dark sensor

Discussion in 'Homework Help' started by gvi70000, Oct 7, 2009.

  1. gvi70000

    Thread Starter Active Member

    Oct 4, 2009
    This is my first post on this forum and I'm also a beginner in electronics have mercy

    I want to build a camera shutter trigger with a light and sound sensor.

    When the microphone detects a sound the shutter is on. I need to adjust the sensitivity to not have false triggers. To see the threshold that triggers my camera i need the led (L1 Indicator - L2 represents the camera trigger circuit)

    For the light sensor i need two modes:
    1. Trigger at lighting or other flashes (sudden light increase)
    2. To trigger when a beam of light that falls on the photo diode is interrupted (to get nice pictures of water drops).

    This is what i want to achieve.

    Instead of photo diode i an use a photo transistor, but it has slower response and I've read that for this type of application BPW34 will do a better job.
    On the light sensor the battery is 3V not 6V (the 6V is an option because i don't know if i can power up the led with it)

    Thank you