Lesson 8 How to Use a Relay
Introduction
The relay is an electronic and electrical component that controls large currents by small
currents. In the course of building a Raspberry Pi project, generally many large current or
high volume devices like solenoid valve, lamp and motor cannot be connected directly to
digital I/Os of the Raspberry Pi. At this moment, a relay can save your project.
Components
- 1 * Raspberry Pi
- 1 * GPIO Extension Board
- 1 * 40-Pin GPIO Cable
- 1 * Breadboard
- 1 * Relay Module
- 1 * 3-Pin Wires
Experimental Principle
The Fritzing image:
The Physical picture:
Experimental Procedures
Step 1: Build the circuit
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