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hellion Posted - May 05 2010 : 12:50:44 PM
I was thinking of making a system for counting of goods on conveyor
belt using photo diode and laserlight. i've managed all th emechanical portion of this project but I will be happy if u provide me the circuit
for counting goods in conveyor belt using photo diode.
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Aaron Cake Posted - May 09 2010 : 10:58:41 AM
There is a sample counter on the circuits page on this site which can be expanded to as many digits as you require (it explains how on the page).

A phototransistor may be slightly easier. Just shade one in a tube and have an IR LED shine at it. Connect the collector to your voltage source through a series resistor and the emittor to the input of the counter IC.

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