In this article, we connect an KY-031 Knock Sensor to a Raspberry Pi Pico, any Rp2040 type board will be suitable. We actually tested this with a Cytron Maker Pi Pico
We will use Micropython for these examples but of course you can use the Arduino IDE as well if you have Raspberry Pi Pico support enabled
The sensor looks like this
Parts Required
You can connect to the module using dupont style jumper wire.
| Name | Link | |
| Raspberry Pi Pico | ![](http://ae01.alicdn.com/kf/S73e52b774f434a8f8e191560b24c8362u.jpg_140x140.jpg") |
|
| 37 in one sensor kit | ![](http://ae01.alicdn.com/kf/Scb660656a1534430bdd567806bc61643e.jpg_80x80.jpg") |
|
| Connecting cables |  |
Schematic/Connection
| Pico | SENSOR |
|---|---|
| GPIO28 | S |
| 3.3V | middle pin |
| GND | – |
Code Examples
Basic example in thonny
from machine import Pin, Timer
import time
# Initialization of GPIO28 as input
button = Pin(28, Pin.IN, Pin.PULL_DOWN)
# Timer initialization
timer = Timer()
# Variables initialization
i = 0
def func(pin):
global i
i = i + 1
print(i)
if button.value() == 1:
# Initialization interrupt
button.irq(handler=func, trigger=button.IRQ_FALLING)
# REPL
print("Tap the sensor")
print("-------------------------------------")
REPL Output
You will get multiple counts per tap – due to the bounce of the sensor and how hard you tap it
MicroPython v1.17 on 2021-09-02; Raspberry Pi Pico with RP2040
Type “help()” for more information.
>>> %Run -c $EDITOR_CONTENT
Tap the sensor
————————————-
>>> 1
2
3
4
Links
https://github.com/getelectronics/rp2040learning/tree/main/Sensor%20Kit/KY-031_Knock_Sensor
