40. Case 36: Color Recognition Password Door

40.1. Introduction

This is a unique code door because it uses colors as the password. The code door will only open when the color cards are placed in the correct order.

40.2. Quick Start

Materials Required

Nezha expansion board × 1

micro:bit V2 × 1

color sensor × 1

Servo × 1

Crash sensor × 1

Bricks × n

Tips: You may need to purchase Nezha Inventor’s Kit and Purchase Interactive coding accessories pack here. if you want all the above components.

Connection Diagram

Inset the micro:bit, connect the color sensor to IIC port, the 360 degrees servo to S1 and the crash sensor to J1 port on Nezha expansion board.

Assembly Video

Video link: https://youtu.be/WiSpnc5fPbA

Assembly Steps

40.3. 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” to download it.

Note: If you met a tip indicating the codebase might be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2

Programme as the pictures indicate

Reference

Link: https://makecode.microbit.org/_3xJgWP2ig48r

You may download it directly below:

Result

Sending the passwords via the colors, press the crash sensor to confirm after you choose the colors ready, the door would open if the two passwords are correct or the micro:bit displays “x” and the program reruns.