24. case 23 micro:bit Crawlers

24.1. Introduction

Let the children use the building blocks and micro:bit to make a crawling caterpillar. In this process, children could experience the fun of building blocks and get a preliminary understanding of the ratchet structure.


24.2. Quick Start

Materials Required

Nezha expansion board × 1

micro:bit V2 × 1

360°servo × 1

Bricks × n

Connection Diagram

Connect the servo to S1 and the micro:bit to Nezha expansion board.


Assembly Video

Assembly Steps
















24.3. MakeCode Programming

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 “nezha” 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.

Programme as the picture shows:



The crawlers move forward after powering on.