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Motion Sensor with a PIR Switch

OVERVIEW A PIR (passive infrared) motion sensor is used to sense movements by people, animals, or other objects that emit IR or heat. The PIR can be used in your projects such as an alarm or an automatic light switch that requires the detection of people. PART 1: OPERATION OF THE PIR SWITCH When the […]

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Difference Between a Common Anode and Common Cathode Tri-Colour LED

OVERVIEW A tri-colour LED can be either common anode (the longer pin is positive) or common anode (the longer pin is negative). The best way to identify which tri-colour LED you have is to set up a circuit to test it.     PART 1: IDENTIFYING THE TRI-COLOUR LED Checking common cathode: Connect the tri-colour […]

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