Arduino IR Transmitter & Receiver w/ LEDs Flickering Issue

I have an Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in principle, but the problem is that when the IR transmitters and receivers are connected to the Arduino, the LEDs flicker with random colors. The specific parts I'm using: Adafruit 36mm 12V LEDs (http://www.ada ...

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