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Tut10 Ten Arduino Projects For Absolute Beginners
P9 Knock
Project 9: Detect a Knock on a Sensor (Knock)
Created on: 2 August 2012
A piezo sensor is connected to analog pin A0 of the Arduino. When the sensor is knocked or tapped, the on board "L" LED will light up and the message "Knock!" is sent out of the serial port for display in the Arduino IDE serial monitor window.
Parts Needed
- 1 × Piezo disc
- 1 × 1M ohm resistor (1 meg ohm)
Arduino Website Page
In the Arduino IDE
File → Examples → 6.Sensors → Knock
Building the Circuit
The circuit diagram and breadboard connections can be found on the Knock Arduino website page.
Programming and Operating the Circuit
Find the sketch for this project under File → Examples → 6.Sensors → Knock in the Arduino IDE and upload it to the Arduino board.
Open the serial monitor window in the Arduino IDE. Tap or knock on the piezo sensor to see the on-board LED light up and the "Knock!" message sent to the serial monitor window.
Project 9 Video
Can't see the video? View on YouTube →
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