micro: Circular RGB LED Expansion Board - Example Code for micro:bit-Tomato Timer

Press key A to start the program and light a LED on the main board in every minute. When all LEDs are on, the buzzer beeps; When key B is pressed, stops the buzzer and stops timing. The circular light refreshes the color in every second. The Pomodoro technique is a simple time management method (25-minute work period).

Hardware Preparation

micro:bit main board ×1
ROB0150 24 RGB LEDs Circular Expansion Board ×1
(Purchase Link)
USB cable ×1

Software Preparation

Development Tool:
MakeCode
https://makecode.microbit.org
Add the Neopixel Software Package
Load the neopixel library to control the LED ring.

Other Preparation Work

Add the neopixel software package (loading the lamp ring library) in Makecode; the steps are as follows:

Add the software package

Sample Code

Click and enter the graphic programming:Tomato Timer

Set Dot Matrix

Set Time

Set the Effect

Result

Press key A: Starts timing, lights one LED on the micro:bit every minute, and circular light refreshes color every second.
When minutes=25: All micro:bit LEDs are on, buzzer beeps.
Press key B: Stops buzzer and timing.

Tomato Timer

Additional Information

Calculation formula for the time interval between each RGB LED: 6000ms (1min) / 24 (24 RGB LEDs) / 60 (repeat 60 times) ≈41ms.