13. Yellow LED

13.1. Introduction

Yellow LED is usually used as the indicator.

../_images/05012_01.png

13.2. Characteristic


  • Designed in RJ11 connections, easy to plug.

13.3. Specification


Item Parameter
SKU EF05012
Connection RJ11
Type of Connection Analog input
Working Voltage 3.3V
Size 55.8 x 23.8 mm

13.4. Outlook


../_images/05012_02.png

13.5. Quick to Start


Materials Required and Diagram


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

../_images/05012_03.png

13.6. MakeCode Programming


Step 1

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

../_images/05001_04.png

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.

../_images/05001_05.png

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:

../_images/05009_06.png

Result

  • The brightness is adjusted by the potentiometer.

13.7. Python Programming


Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

../_images/05001_072.png

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

Step 2

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)

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.

13.8. Relevant File


13.9. Technique File