En piezo-højttaler fra en 10-kroners vinduesalarm med en 1 M-Ohm modstand i parallel som vibrationssensor, en lysdiode sat direkte til og en bid kode, så har man en lysmarkør.
- Arduinomarkør (Medium).jpg (80.45 KiB) Vist 9393 gange
Kode: Kopieres over i editorprogrammet (freeware) og sendes til Arduinoen med et USB-kabel. Derefter kan den køre på et 9V-batteri.
/* Impact Sensor
This sketch reads a piezo element to detect a knocking sound.
It reads an analog pin and compares the result to a set threshold.
If the result is greater than the threshold, it toggles the LED on pin 13.
The circuit:
* + connection of the piezo attached to analog in 0
* - connection of the piezo attached to ground
* 1-megohm resistor attached from analog in 0 to ground
Based on:
http://www.arduino.cc/en/Tutorial/Knock
created 25 Mar 2007
by David Cuartielles <http://www.0j0.org>
modified 30 Aug 2011
by Tom Igoe
Modified for target sensor FEB 2012 Refraktorius
This example code is in the public domain.
*/
// these constants won't change:
const int ledPin = 13; // led connected to digital pin 13
const int knockSensor = A0; // the piezo is connected to analog pin 0
const int threshold = 50; // threshold value to decide when the detected sound is an impact or not
// these variables will change:
int sensorReading = 0; // variable to store the value read from the sensor pin
int ledState = LOW; // variable used to store the last LED status, to toggle the light
void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
}
void loop() {
// read the sensor and store it in the variable sensorReading:
sensorReading = analogRead(knockSensor);
// if the sensor reading is greater than the threshold:
if (sensorReading >= threshold) {
// LED on if above trshold:
ledState = HIGH;
// update the LED pin itself:
digitalWrite(ledPin, ledState);
delay(2000); //keep it busy for 2 seconds
digitalWrite(ledPin, LOW); // set the LED off
}
delay(100); // delay to avoid overloading the serial port buffer.... is this needed?
}
til munken.
