Smart Laser™ Sensor Activated Green Laser/Light Combo
Hacking a PIR Motion Sensor for Use As a Triggering Device. : 5 Steps (with Pictures) - Instructables
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Icstation 5V Light Sensor Module Receiver for Arduino, High Level Output, Work with Relay Switch, Non-Modulator(Pack of 5): Amazon.com: Industrial & Scientific
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Motion sensors (PIR), beam sensors and hand triggers for activating prop controllers.