4. Sound Sensor(EF05003)

4.1. Introduction

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

4.2. Products Link

ELECFREAKS PlanetX Noise Sensor

4.3. Characteristic

Designed in RJ11 connections, easy to plug.

4.4. Specification

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

4.5. Outlook

4.6. Quick to Start

4.6.1. 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.

4.7. MakeCode Programming

4.7.1. 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.

4.7.2. Step 2

4.7.3. Code as below:

4.7.4. Link

Link: https://makecode.microbit.org/_Vr4PPtfefeWw

You may also download it directly below:

4.7.5. Result

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

4.8. Python Programming

4.8.1. Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

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.

4.8.2. Step 2

4.8.3. 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))
        

4.8.4. Result

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

4.9. Relevant File

4.10. Technique File