25. Relay Module

25.1. Introduction

It adopts a mini and high-quality HUIKE relay.


25.2. Characteristic

  • Designed in RJ11 connections, easy to plug.

25.3. Specification

Item Parameter
SKU EF05025
Connection RJ11
Type of Connection Digital input
Working Voltage 3.3V

25.4. Outlook


25.5. Quick to Start

Materials Required and Diagram

  • Connect the Relay to J1 port in the Nezha expansion board as the picture shows.


25.6. MakeCode Programming

Step 1

Click “Advanced” in the MakeCode drawer to see more choices.


We need to add a package for programming, . Click “Extensions” in the bottom of the drawer and search with “PlanetX” in the dialogue box to download it.


Note: If you met a tip indicating that the codebase will be deleted due to incompatibility, you may continue as the tips say or build a new project in the menu.

Step 2

Code as below:



  • It switches the current channels by pressing button A or B.

25.7. Python Programming

Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor


We need to add enum.py and relay.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and relay.py from the unzipped package of PlanetX_MicroPython.

../_images/05001_081.png ../_images/05001_091.png ../_images/05025_10.png

Step 2


from microbit import *
from enum import *
from relay import *

l = RELAY(J1)


  • Control the off/on of the Relay.

25.8. Relevant File

25.9. Technique File