Pump + is powered from 3.3V pin of the Arduino. Pump − is controlled via the 2n2222 transistor, which is connected to Arduino pin 13,12,8,7,4. Arduino Pin 2 controls the transistor's base to switch ...

Controlling the Indicator: When the Arduino pin (2 or 3) is set HIGH, it will drive the transistor into conduction, allowing current to flow through the indicator light, turning it on. When the pin is ...

A switch is the most essential part of any circuit. Different circuits use different switches in them. In this project, we are going to use a Touch Dimmer Switch. This switch is a touch-sensitive ...