A switch is the most essential part ... the Vcc pin and ground pin to the 5V and ground of the Arduino. Connect the SIG or OUT pin of this module to the pin8 of the Arduino. Connect the 2N2222 ...

Light Switch Is an Arduino project in which we construct a circuit that can be activated by shining a light on the sensor. It incorporates a photoresistor sensor (KLS6-3537), an n3904 transistor ...

Four-wire computer ... Note that you must use a transistor to pull the connection down, as the voltage sometimes goes much higher than an Anduino port can handle. The fan may not be able to handle ...

Electronics enthusiasts or tattoo artists may be interested in a new touchless switch which ... project uses an Arduino Uno, a distance sensor module, and an FET driver transistor module.