User Manual

71
Lesson 28 Relay Module
Introduction
Relays are suitable for driving high power electronic devices such as lights, electric fans and
air condition. A relay can be used to control high voltages with a low voltage by connecting
it to an MCU.
Components
- 1 * SunFounder Uno board
- 1 * USB data cable
- 1 * Relay module
- Several jumper wires
Experimental Principle
Connect IO to the SunFounder Uno board. When we make the transistor output low level
(0V) by programming, the transistor will conduct electricity because of current saturation.
The normally open contact of the relay will be closed, while the normally closed contact of
the relay will be opened; when it outputs high level (5V), the transistor will be cut off, and the
relay will restore to the initial state.
Experimental Procedures
Step 1: Build the circuit
Relay module SunFounder Uno
S ---------------------------------------- D6
- --------------------------------------- GND
+ ----------------------------------------- 5V
Step 2: Program (Please refer to the example code in LEARN -> Get Tutorial on our website)
Step 3: Compile
Step 4: Upload the sketch to SunFounder Uno
SunFounder