IR Photogate

This is a simple photogate using a IR-led and a IR-photodiode. It can sense objects crossing the beam. The photogate is adaptable by changing resistors, IR-led and IR-photodiode.It is a small circuit and has few components.IR uses a specific part of the spectrum, so it has limited interference by ot...
By: Ben1998

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[original story: Instructables]

Instructables 18 Mar 16:52