17. Case 16: Memory Test

17.1. Introduction

Build a memory test device with the micro:bit.


17.2. Quick to Start


Nezha expansion board × 1

micro:bit × 1

LED-red × 1

LED-green × 1

RJ11 wires × 2

Bricks × n


Bricks details


Connection Diagram

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


Bricks Build-up

  • Build a device as the pictures indicate:



Video link:https://youtu.be/ie4sO5qNvfM

17.3. 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 “PlanetX” 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.

Step 2

Programme as the picture shows:



  • The red and green LEDs light on at random, press button A while the red lights on; press button B while the green lights on, if you press them at the right sequence(A for red and B for green ), the micro:bit display a “√” or it displays a sad face.