2. Case 01: Traffic Lights

2.1. Introduction

To make a traffic lights system controlled by the micro:bit.


2.2. Quick Start

Materials Required

Nezha expansion board × 1

micro:bit × 1

LED-red × 1

LED-green × 1

LED-yellow × 1

RJ11 wires × 3

Bricks details



Connection Diagram

  • Connect the red LED to J1, yellow LED to J2 and green LED to J3 on the Nezha expansion board as the picture shows.









Video reference:https://youtu.be/TmsDDWLcgcs

2.3. Makecode Programming

Step 1

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


For programming, we need to add a package: click “Extensions” at the bottom of the MakeCode drawer and search with “PlanetX” in the dialogue box to download it.


Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2

Code as below:




You may also download it directly below:



  • The red LED lights on for 5 seconds and then lights off; the yellow LED lights on for 2 seconds and off then; the green LED lights on for 5 seconds and off then.