BirdCounter

BirdCounter

/*
  Platform: Arduino Uno
 Monitor an infrared breakbeam sensor (digital port 4) for interruptions 
 and increment a LED display with a counter.
 */

#include <Wire.h>
#include "Adafruit_LEDBackpack.h"
#include "Adafruit_GFX.h"

Adafruit_AlphaNum4 alpha4 = Adafruit_AlphaNum4();

#define LEDPIN 13
#define SENSORPIN 4

int sensorState = 0, lastState=0;
int birdCounter = 0;
char displaybuffer[4] = {
  ' ', ' ', ' ', ' '};

void setup() {
  // initialize the LED pin as an output:
  pinMode(LEDPIN, OUTPUT);      
  // initialize the sensor pin as an input:
  pinMode(SENSORPIN, INPUT);     
  digitalWrite(SENSORPIN, HIGH); // turn on the pullup

  alpha4.begin(0x70);
  alpha4.clear();
  alpha4.writeDisplay();
}

void loop(){
  sensorState = digitalRead(SENSORPIN);

  if (sensorState == LOW) {     
    digitalWrite(LEDPIN, HIGH);  
  } 
  else {
    digitalWrite(LEDPIN, LOW); 
  }

  if (!sensorState && lastState) {
    // update our counter by one
    birdCounter++;
    
    // split our integer into digits
    displaybuffer[0] = (char)(((int)'0')+(birdCounter%10));
    displaybuffer[1] = (char)(((int)'0')+((birdCounter/10)%10));
    displaybuffer[2] = (char)(((int)'0')+((birdCounter/100)%10));
    displaybuffer[3] = (char)(((int)'0')+(birdCounter/1000));

  }
  lastState = sensorState;

  // put the digits into buffer
  alpha4.writeDigitAscii(0, displaybuffer[3]);
  alpha4.writeDigitAscii(1, displaybuffer[2]);
  alpha4.writeDigitAscii(2, displaybuffer[1]);
  alpha4.writeDigitAscii(3, displaybuffer[0]);

  // push our buffer to display
  alpha4.writeDisplay();
  delay(500);
}