1 Using Relays and Relay Boards with the Raspberry Pi
Explains driving relays and relay boards from Raspberry Pi GPIO pins; people follow it as a wiring tutorial and ask whether 3.3 V logic safely triggers 5 V boards.
Channel
Gaven MacDonald
9 recommended videos. Channel on YouTube
2 Using Optocouplers with the Raspberry Pi
Explains how an optocoupler isolates a Raspberry Pi from motors, pumps and other noisy loads; answerers recommend it as a clear account of how the part works.
3 Servo Control with the Raspberry Pi
A Raspberry Pi GPIO walkthrough that people follow to drive a servo with PWM pulses, also cited for basic LED wiring to the board's pins.
4 Controlling a DC Motor with the Raspberry Pi
A beginner tutorial on driving a small DC motor from Raspberry Pi GPIO with a transistor and PWM, suggested as a basics starting point.
5 Simple Button Input with the Raspberry Pi
A classroom-style walkthrough of reading a push button on Raspberry Pi GPIO, covering pull-up versus pull-down wiring before the Python code.
6 Ultrasonic Sensor with the Raspberry Pi
A guide to reading an ultrasonic distance sensor from a Raspberry Pi, including a resistor divider to drop the 5V echo signal for the GPIO pins.
7 PNP Transistor Tutorial (with the Raspberry Pi)
Recommended as a basic introduction to switching a load with a PNP transistor, listed alongside guides on LED resistors and optocouplers.
8 Stepper Motor Control with the Raspberry Pi
A tutorial on controlling servo motors from Raspberry Pi GPIO pins, suggested as a natural next step once basic GPIO control feels comfortable.
9 What are the input voltage thresholds for the Raspberry Pi's GPIO pins?
Measures the input voltage thresholds of Raspberry Pi GPIO pins; often cited for the roughly 1.2 V switching point, though it tests an older Pi model.
