12. Blue LED(EF05011)

12.1. Introduction

Blue LED is usually used as the indicator.

12.2. Products Link

ELECFREAKS PlanetX LED-Blue

12.3. Characteristic

Designed in RJ11 connections, easy to plug.

12.4. Specification

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

12.5. Outlook

12.6. Quick to Start

12.6.1. 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.

12.7. MakeCode Programming

12.7.1. 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.

12.7.2. Step 2

12.7.3. Code as below:

12.7.4. Link

Link: https://makecode.microbit.org/_eTHcUiPhjLpz

You may also download it directly below:

12.7.5. Result

The brightness is adjusted by the potentiometer.

12.8. Python Programming

12.8.1. 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.

12.8.2. Step 2

12.8.3. Reference

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

while True:
    led.set_led(1,100)
    sleep(1000)
    led.set_led(1,50)
    sleep(1000)
    led.set_led(0,50)
    sleep(1000)

12.8.4. 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.

12.9. Relevant File

12.10. Technique File