4. Sound Sensor

4.1. Introduction

Sound Sensor is particularly sensitive to sound intensity, and it can be used to detect ambient sound level.

../_images/05003_01.png

4.2. Characteristic


  • Designed in RJ11 connections, easy to plug.

4.3. Specification


Item Parameter
SKU EF05003
Connection RJ11
Type of Connection Analog output
Working Voltage 3.3V
Size 55.8 x 23.8 mm

4.4. Outlook


../_images/05003_02.png

4.5. Quick to Start


Materials Required and Diagram


  • Connect the sound sensor to J1 port and the OLED module to IIC port in the Nezha expansion board as the picture shows.

../_images/05003_03.png

4.6. MakeCode Programming


Step 1

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

../_images/05001_04.png

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.

../_images/05001_05.png

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

Code as below:

../_images/05003_06.png

Result

  • The value of the sound(dB) in the current environment displays on the OLED module.

4.7. Python Programming


Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

../_images/05001_072.png

We need to add enum.py and noise.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add enum.py and noise.py from the unzipped package of PlanetX_MicroPython.

../_images/05001_081.png ../_images/05001_091.png ../_images/05003_10.png

Step 2

Reference


from microbit import *
from enum import *
from noise import *

while True:
    noise = NOISE(J1)
    noise_value = int(noise.get_noise())
    display.scroll(str(noise_value))
        

Result

  • The value of the sound(dB) in the current environment displays on the micro:bit.

4.8. Relevant File


4.9. Technique File