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Non-Contact Voltage Detector

OVERVIEW A non-contact voltage detector is a useful tool to detect nearby electrical fields. It can detect the presence of AC power in cables, switches, outlets, and fixtures without touching them. It can even detect static electricity!   PART 1: ASSEMBLE THE CIRCUIT     PART 2: OPERATION OF THE CIRCUIT A transistor is normally […]

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Display Characters on an LCD

OVERVIEW An LCD display can replace your Serial Monitor as a display module. This is useful for standalone projects, where the Arduino runs on its own power supply and is not connected to a computer. PART 1: ASSEMBLE THE LCD NOTE: For proper soldering technique, see Guide: Soldering Technique.   Pin Name Function 1 Vss GND […]

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Capacitive Touch Switch

OVERVIEW A capacitive touch switch is a switch that works by touch. It even works when your hand is close to it. This means you can conceal your switch under plastic, wood, or other insulating material and still trigger the switch by touch. PART 1: ASSEMBLE THE CIRCUIT     PART 2: PROGRAM THE ARDUINO […]

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Switch a High-Power Circuit with a Relay

OVERVIEW WARNING: Do not construct circuits involving mains supply without close expert supervision. You risk electrical shock which can be fatal. A relay is normally used to switch a high-power circuit such as mains power. The relay is controlled with a low-power circuit. Inside the relay is a coil that is energised by a low-power […]

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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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