Control Raspberry Pi case fan on/off using CPU temperature

This schematic is a project in which we control the switching of bulb/lamp using Arduino and NPN TIP120 Power transistor (used as a switch).

Circuit diagram and explanation of a master-slave D-Type Flip-Flop (DFF) built with discrete BJTs and passive components.

Programmable DC power supply based on Arduino UNO WiFi Rev2

Cooling Raspberry Pi, which is running LibreELEC, by controlling the fan speed of a 5V fan.

This project demonstrates controlling a relay using a PIC16F877A microcontroller. A push button connected to RB0 acts as the input. When pressed, the relay connected to RB1 is turned ON; when released, the relay turns OFF.

Programmable DC power supply based on Arduino UNO WiFi Rev2