Connect a Raspberry Pi to a KY-031 Knock Sensor

Parts Required

You can connect to the module using dupont style jumper wire. There is no reason this device will not work with any Raspberry Pi hardware that you have – in this example a Raspberry Pi 4 but you can use a Zero if you want a lower cost solution

Name		Link
Raspberry Pi 4		Aliexpress link Amazon Ebay
37 in one sensor kit		Aliexpress link Amazon link
Connecting cables		Aliexpress link Amazon Ebay

Schematic/Connection

Code Examples

Basic example in  thonny, running on the Raspberry Pi

import RPi. GPIO  as  GPIO
import time
   
GPIO.setmode (GPIO.BCM) 
   
# Here the input pin to which the Knock Sensor is connected
GPIO_PIN = 24
GPIO.setup (GPIO_PIN, GPIO.IN) 
   
print ("Knock Sensor test [press CTRL+C to exit the test]")
   
#  This output function is executed when a signal is detected
def outputFunction(null) :
    print("Knock Sensor triggered")
   
#  When a signal is detected (falling signal edge), the output function is triggered
GPIO.add_event_detect(GPIO_PIN, GPIO.FALLING, callback= outputFunction ,  bouncetime=100)  
   
# Main loop
try:
    while True:
        time.sleep (1) 
   
except KeyboardInterrupt:
    GPIO.cleanup ()

REPL Output

Tap the sensor

>>> %Run -c $EDITOR_CONTENT
Knock Sensor test [press CTRL+C to exit the test]
Knock Sensor triggered
Knock Sensor triggered

Links

https://github.com/getelectronics/PIBits/tree/master/Sensor%20Kit/KY-031%20KNOCK%20SENSOR