Arduino - Tilt sensor

Hardware

In dit voorbeeld gebruiken we een Tilt sensor om interne led (D13) aan en uit te schakelen, er is echter een handigheidje nodig met een tijdsinterval om de ‘ruis’ van de digitale poort te onderdrukken, dit is omdat de digitale poort wel duizenden keren per seconde wordt uitgelezen, dit geeft voor een drukknop geen goed beeld, vandaar de ’timer’, sluit het volgende aan via onderstaand schema:

/* 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()
{
  pinMode(inPin, INPUT);
  digitalWrite(inPin, HIGH);   // turn on the built in pull-up resistor
  pinMode(outPin, OUTPUT);
}
 
void loop()
{
  int switchstate;
 
  reading = digitalRead(inPin);
 
  // 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;
}

/* 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()

{

pinMode(inPin, INPUT);

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

pinMode(outPin, OUTPUT);

}

void loop()

{

int switchstate;

reading = digitalRead(inPin);

// 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;

}

Bron: learn.adafruit.com

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Arduino – Tilt sensor

Hardware