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In this article, we connect an KY-031 Knock Sensor to an Arduino Uno
The KY-031 Knock Sensor module is a vibration sensor that sends a signal when a knock/tap is detected on the module.
This module consists of a spring-based sensor, a 10K resistor and a header. The spring sends a high signal when a vibration is detected.
Parts Required
You can connect to the module using dupont style jumper wire.
This should work with other Arduino board – I have tried an Uno and Mega
| Name | Link | |
| Arduino Uno |  |
|
| 37 in one sensor kit |  |
|
| Connecting cables |  |
Schematic/Connection
| ARDUINO | SENSOR |
|---|---|
| Pin 2 | Signal |
| 5 V | +V |
| GND | GND |
Code Example
The following code example will switch the onboard LED the Arduino when the module is tapped
int LedPin = 13 ;// define LED Interface
int ShockPin = 2; // define the percussion Sensor Interface
int val ;// define numeric variables val
void setup ()
{
pinMode (LedPin, OUTPUT) ;// define LED as output interface
pinMode (ShockPin, INPUT) ;// define knock sensor output interface
}
void loop ()
{
val = digitalRead (ShockPin) ;// read ShockPin
if (val == HIGH) // When the knock switch is triggered the LED flashes
{
digitalWrite (LedPin, LOW);
}
else
{
digitalWrite (LedPin, HIGH);
}
}
Serial Monitor Output
N/A
Links
https://github.com/getelectronics/ArduinoCode/tree/main/37%20Sensor%20Kit/KY-031_Knock_Sensor