7. case 04 Smart Wardrobe

7.1. Goal

Make an auto window.

7.2. Materials

1 x ELECFREAKS micro:bit Smart Home Kit 1 x corrugated board

7.3. Background

What is an auto window ?

Noise pollution is a common problem in our life. When the value of noise higher than 70dB, it is will impact our health. We will design a smart window and door using micro:bit.

Auto window operation

Using micro:bit detect wether the the value of noise higher than 70dB and control servo to closing the door and the window.

7.4. Practical operation

Materials: corrugated board and cutter

Build as below picture：

Front side：

Back side：

Paste devices as below piture:

7.5. Hardware connect

7.6. Software

makecode

Edge Connector Data Sheet

7.7. Programming

Step 1

Go to MakeCode page, click Advanced in the code block and click on Extensions.

We need to add a new codebase for programming of smart home. Finding “Add Package” in the bottom of code block and click it. Then a message box will show up, search “smart home”， and download this new codebase.

Note： If there is a hint says some codebase will be deleted because of incompatibility. Don’t worry. You could go ahead as the hint or build a new item in item menu bar.

Step 2

Drag on start on from Basic, snap into servo write pin, set P1 to 0.

Step 3

Snap set item to into forever, assignment value of noise to noise variables.

Step 4

If value of noise > 70dB, snap into servo write pin,set P1 to 0 and the window be closed.

Step 5

If value of noise < 70dB，snap into servo write pin,set P1 to 100 and the window be opened.

Programming

Make code：https://makecode.microbit.org/_Trh6x75hYcAT

You also could directly download program visit website as below:

7.8. Result

micro:bit driving servo open the window when value of noise > 70dB.

Front side：

Back side：

7.9. Think

How to know wether open the window on room temperature.

7.10. Questions

7.11. More information