Various types of sensors such as infrared sensors.

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Door Window Sensor Magnetic Reed Switch For Security Alarm System
This door-window sensor magnetic reed switch for security/alarm systems is great for DIY alarm syste..
TSOP4838 Infrared Receiver 2.5V - 5.5V 38kHz
The TSOP4838 infrared receiver makes a great infrared sensor for Arduino and other hobby projects ne..
$0.85 $0.43 -50%
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