12. Blue LED(EF05011)

12.1. Introduction

Blue LED is usually used as the indicator.


12.2. Characteristic

  • Designed in RJ11 connections, easy to plug.

12.3. Specification

Item Parameter
SKU EF05011
Connection RJ11
Type of Connection Analog input
Working Voltage 3.3V
Size 55.8 x 23.8 mm

12.4. Outlook


12.5. Quick to Start

12.5.1. Materials Required and Diagram

  • Connect the Blue LED to J1 port and the potentiaometer to J2 port in the Nezha expansion board as the picture shows.


12.6. MakeCode Programming

12.6.1. 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.

12.6.2. Step 2

12.6.3. Code as below:


12.6.5. Result

  • The brightness is adjusted by the potentiometer.

12.7. Python Programming

12.7.1. Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor


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

../_images/05001_081.png ../_images/05001_091.png ../_images/05009_10.png

12.7.2. Step 2

12.7.3. Reference

from microbit import *
from enum import *
from led import *
led = LED(J1)

while True:

12.7.4. Result

  • LED lights on in 100% brightness for one second and 50% brightness for another sencond and lights off for one second after powering on and it continues working in this way.

12.8. Relevant File

12.9. Technique File