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Microbit Halo Programmable Expansion Board Tutorial 1.1 Light up a single colorful light

Posted by Fiona Su on

Microbit Halo Programmable Expansion Board Tutorial 1.1 Light up a single colorful light (Download


The data protocol of the programmable RGB lamp adopts the single-line return-to-zero code communication mode. After the power-on reset, the DIN terminal accepts the data transmitted from the controller. The first 24 bits of data sent by the first pixel are extracted, the data latch is sent to the inside of the pixel. And the remaining data is shaped and amplified by the internal shaping processing circuit, then the output is forwarded to the next cascaded pixel by the DO port.



If the programmable RGB lamp is fully lit, the battery is not enough voltage, it will affect the effect. It is recommended to use the USB data cable to plug in the micro:bit light ring expansion board interface. As shown in the figure below.


2. Learning goals:

In this lesson we will learn how to light up first RGB lamp with blue by programming.You can modify other color in the program by yourself.

3. Programming method:

Online programming:

First, we need to connect the micro:bit to the computer by USB data cable, the computer will pop up a USB flash drive.Then, click on the URL in the USB flash drive: http://microbit.org/ to enter the edit process interface.

Offline programming:

Open the offline programming softwareimage.png,download address of this software: http://www.microbitgo.com/code.

After creating a new project, you need to load the Neopixel library to program the programmable RGB lights. To load the library, click on Advanced】Extensions】  click on Neopixel, and you will see an extra column in the programming interface. As shown in the figure below.




General program diagram:

image.pngOur programmable RGB lamp is connected to the pin2 of micro:bit, so the pin2 is set to no pull-up/pull-down mode by default. Then use the following statement to create a new NeoPixel driver named Strip.

image.png Next, light up the first RGB light with blue in the strip and displays it.


4.Download program

We need to make sure that the micro:bit board is connected to the computer. Click the download in the lower left corner as shown below, and select the download path as micro:bit drive letter to download the program.


5.Experimental phenomena

After the program is successfully downloaded, you can see that the first light of the RGB LED Circular expansion board is lit blue. As shown in the figure below.



Microbit Halo Programmable Expansion Board Tutorial

Buy Yahboom Microbit Halo Programmable Expansion Board


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