i need help

Discussion in 'The Projects Forum' started by tanifor, Jan 19, 2009.

  1. tanifor

    Thread Starter New Member

    Jan 19, 2009
    i need help to connect and extract the analog output of a photodiode to trigger a digital circuit.can anyone help me out?
  2. jj_alukkas

    Distinguished Member

    Jan 8, 2009
    What is the light source you are going to use to trigger it?IR, Laser, Ordinary light? what type of triggering do you need? I mean when light falls on it, should it give a high(5v) or low(ov) output?? What is the output you are going to drive? Load or TTL?

    Please provide such details for everyone to help you faster..
  3. mik3

    Senior Member

    Feb 4, 2008
    Use an op amp as a comparator to sense the voltage the photodiode creates with a reference voltage.