It sounds to me like mhester wants to count light pulses, and after a certain count drive an output high. The pulses will come in at Mhz or KHz frequencies. (Will a photodiode react that quickly???)Trying to count light pulses from photodiode and drive an output high. Need to be able to vary (ideally through a pot) the count to drive high. time in micro or at least milliseconds.
by Robert Keim
by Jake Hertz
by Duane Benson
by Jake Hertz