This sensor emits a signal if the sensor detects a noise. The sensitivity of the sensor can be adjusted by means of a controller.

Note on use

This sensor is ideally suited for threshold measurement. This means that the sensor emits a digital high signal as soon as a threshold value set by the user is exceeded. However, this also means that the analog measured values are not suitable for conversions, as the analog signal is also influenced by the rotary potentiometer.

Digital output: Via the potentiometer, a limit value for the received sound can be set, at which the digital output should switch.

Analog output: Direct microphone signal as voltage level

LED1 : Indicates that the sensor is powered

LED2 : Indicates that a noise has been detected

Function of the sensor

This sensor has three functional components on its circuit board: The front sensor unit, which physically measures the environment and outputs it as an analog signal to the second unit, the amplifier. This amplifies the signal depending on the resistance set on the rotary potentiometer and sends it to the analog output of the module.

Here it is to be noted: The signal is inverted. If a high value is measured, this results in a lower voltage value at the analog output.

The third unit represents a comparator, which switches the digital output and the LED when the signal falls below a certain value. This value (and thus the sensitivity of the module) can be adjusted via the rotary potentiometer:

Pin assignment

Code example Arduino

Connection assignment Arduino

Arduino Sensor
5 V +V
Ground GND
Pin 3 Digital Signal
Pin A0 Analog Signal

The program reads the current voltage value, which can be measured at the analog output, and outputs it on the serial port.

In addition, the status of the digital pin in the console is also indicated, which means whether the limit has been exceeded or not.

// Declaration and initialization of input pins
int Analog_Input = A0; // Analog output of the sensor
int Digital_Input = 3; // Digital output of the sensor
void setup  ( )
  pinMode (Analog_In, INPUT);
  pinMode (Digital_Inbox, INPUT);
  Serial.begin (9600)  ;  //  Serial output with 9600 bps
//  The program reads the current values of the input pins
// and output it on the serial output
void loop  ( )
  float Analog;
  int Digital;
  //Actual values are read out, converted to the voltage value...
  Analog =  analogRead (Analog_In)   *   (5.0 / 1023.0); 
  Digital = digitalRead (Digital_Inbox)  ;
  //...  and issued at this point
  Serial.print  ("Analog voltage value:");  Serial.print (Analog,  4)  ;   Serial.print   (“V, “);
  Serial.print (“Limit:”)  ;
  if (Digital==1)
      Serial.println (“reached”);
      Serial.println (“not reached yet”);
  Serial.println  ( " ----------------------------------------------------------------") ;
  delay (200)  ;

Sample program Download

Code example Raspberry Pi

Connection assignment Raspberry Pi

Raspberry Pi Sensor
GPIO 24 [Pin 18] Digital Signal
3.3 V [Pin 1 ] +V
Ground [ Pin 6 ] GND
KY-053 A0 Analog signal
Sensor KY-053
Analog signal A0
+V 3,3 V [Pin 1 ]
GND Ground [ Pin 6 ]
Raspberry Pi KY-053
GPIO 3 [ Pin 5 ] SCL
GPIO 2 [Pin 3 ] SDA

Analog sensor, therefore the following must be considered: The Raspberry Pi has, in contrast to the Arduino, no analog inputs or there is no ADC (analog digital converter) integrated in the chip of the Raspberry Pi. This limits the Raspberry Pi, if you want to use sensors, which do not output digital values, but a continuously changing value (example: potentiometer -> different position = different voltage value).

To avoid this problem, our sensor kit X40 contains the KY-053, a module with a 16-bit ADC, which you can use on the Raspberry to expand it with 4 analog inputs. This module is connected to the Raspberry Pi via I2C, takes over the analog measurement and transfers the value digitally to the Raspberry Pi.

So we recommend to connect the KY-053 module with the mentioned ADC in between for analog sensors of this set. You can find more information on the KY-053 Analog Digital Converter information page.

The program uses the corresponding ADS1x15 and I2C Python libraries from Adafruit to control the ADS1115 ADC. These have been published at the following link under the MIT license. The required libraries are not included in the download package below.

The program reads the current values of the input pins and outputs them in the console as a value in [mV].

Please note that you need to enable I2C on your Raspberry Pi before using this example.

# coding=utf-8

import time
import board
import busio
import adafruit_ads1x15.ads1115 as ADS
from adafruit_ads1x15.analog_in import AnalogIn
import RPi.GPIO as GPIO
# Create the I2C bus
i2c = busio.I2C(board.SCL, board.SDA)

# Create the ADC object using the I2C bus
ads = ADS.ADS1115(i2c)

# Create single-ended input on channels
chan0 = AnalogIn(ads, ADS.P0)
chan1 = AnalogIn(ads, ADS.P1)
chan2 = AnalogIn(ads, ADS.P2)
chan3 = AnalogIn(ads, ADS.P3)

delayTime = 1
Digital_PIN = 24

GPIO.setup(Digital_PIN, GPIO.IN, pull_up_down = GPIO.PUD_OFF)

while True:
    analog = '%.2f' % chan0.voltage
    # output to console
    if GPIO.input(Digital_PIN) == False:
        print ("Analog voltage value:", analog, "V, ", "Limit: not yet reached")
        print ("Analog voltage value:", analog, "V, ", "Limit: reached")
    print ("---------------------------------------")
    # reset + delay
    button_pressed = False

Sample program download

To start with the command:

sudo python3

Code example Micro:Bit

Pin assignment Micro : Bit:

Micro: Bit Sensor
Pin 0 A0
Pin 1 D0
3 V +V
Ground GND

Sample program download