IR Emitters

Created by	Erik Kringen (kringen)
Created	April 29, 2013
Last modified	May 05, 2013
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Summary

This circuit is used for object tracking. See http://www.mycontraption.com/desktop-robot-object-tracking-with-infrared/ for more details. The 38Khz signal is applied to the ground side of each IR LED through the use of an NPN transformer. Each LED takes a turn emitting while the other 3 are off. While the LED is on, the receiver counts the number of samples where IR is detected. Then the LED goes off and the cycle continues on to the other 3 LED’s.