28. Case 27: The Distance Indicator

28.1. Introduction

This is a distance detection device. In order to prevent the spread of the epidemic, people should maintain a certain social distance in public. This device can display the distance between the carrier and the person in front of it on the screen.

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28.2. Quick Start

Materials Required

Nezha expansion board × 1

micro:bit V2 × 1

sonar sensor × 1

Bricks × n

Connection Diagram

Inset the micro:bit, and connect the sonar:bit to J1 port on Nezha expansion board.

../../_images/case_27_03.png

Assembly Video

Video link: https://youtu.be/0HgP_YVgNJU

Assembly Steps

../../_images/case_step_27_01.png

../../_images/case_step_27_02.png

../../_images/case_step_27_03.png

../../_images/case_step_27_04.png

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28.3. MakeCode Programming

Step 1

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

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We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “nezha” to download it.

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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

../../_images/case_27_10.png

Reference

Link: https://makecode.microbit.org/_Vb69KzLR3Dhe

You may download it directly below:

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Result

After powering on, the detected distance displays on the micro:bit.

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