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Sound Sensor(EF05003)


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

ELECFREAKS PlanetX Noise Sensor


Designed in RJ11 connections, easy to plug.


Type of ConnectionAnalog output
Working Voltage3.3V
Size55.8 x 23.8 mm


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.

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 "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.

Step 2

Code as below:


You may also download it directly below:


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

Python Programming

Step 1

Download the package and unzip it: PlanetX_MicroPython

Go to Python editor

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

Step 2


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

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


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

Relevant File

Technique File