Simple tilt (vibration) sensor switch example

Simple Arduino example adapted from Adafruit to turn an LED on/off using a vibration sensor switch.

Components

• • 1 x vibration sensor switch 

  • 1 x 10k ohm resistor

  • 1 LED

• 1 x Arduino Uno

  • 1 x breadboard

  • jumper wires

Setup

Arduino sketch

From Adafruit.

/* Better Debouncer

 * 

 * This debouncing circuit is more rugged, and will work with tilt switches!

 *

 * http://www.ladyada.net/learn/sensor/tilt.html

 */

int inPin = 2;         // the number of the input pin

int outPin = 13;       // the number of the output pin

int LEDstate = HIGH;      // the current state of the output pin

int reading;           // the current reading from the input pin

int previous = LOW;    // the previous reading from the input pin

// the follow variables are long's because the time, measured in miliseconds,

// will quickly become a bigger number than can be stored in an int.

long time = 0;         // the last time the output pin was toggled

long debounce = 50;   // the debounce time, increase if the output flickers

void setup()

{

  Serial.begin(9600);

  pinMode(inPin, INPUT);

  digitalWrite(inPin, HIGH);   // turn on the built in pull-up resistor

  pinMode(outPin, OUTPUT);

}

void loop()

{

  int switchstate;

  reading = digitalRead(inPin);

  Serial.println( reading );

  // If the switch changed, due to bounce or pressing...

  if (reading != previous) {

    // reset the debouncing timer

    time = millis();

  } 

  if ((millis() - time) > debounce) {

     // whatever the switch is at, its been there for a long time

     // so lets settle on it!

     switchstate = reading;

     // Now invert the output on the pin13 LED

    if (switchstate == HIGH)

      LEDstate = LOW;

    else

      LEDstate = HIGH;

  }

  digitalWrite(outPin, LEDstate);

  // Save the last reading so we keep a running tally

  previous = reading;

}