GuruBlog

I made a small device that has 3 independent counters which are shown on a lcd-display. The device uses an arduino and has 3 buttons on the front that are debounced in software and used to increment a variable. The variables are printed on a 1x16 char lcd-display.

the red switch on the side is a power-switch.

i really like the "frankenstein"-look of the eclosure :-)

i also made some sort of a "schematic". scroll down to see the arduino sketch i'm using

arduino sketch:

#include <LiquidCrystal.h>

LiquidCrystal lcd(6, 7, 8, 2, 3, 4, 5);

const int pinA = 9;
const int pinB = 10;
const int pinC = 11;

int lastA = LOW;
int lastB = LOW;
int lastC = LOW;

int stateA;
int stateB;
int stateC;

const long DELAY = 100;

long lastATime = 0;
long lastBTime = 0;
long lastCTime = 0;

void setup() {
  // Print a message to the LCD.
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("hello, w");
  lcd.setCursor( 0, 1);
  lcd.print("orld!");

  delay(1000);
  lcd.clear();

  pinMode( pinA, INPUT );
  pinMode( pinB, INPUT );
  pinMode( pinC, INPUT );
  pinMode( 13, OUTPUT );

  printNumbers(0, 0, 0);
}

int a, b, c = 0;
boolean changed = false;

void loop() {
  changed = false;

  int readA = trippleRead( pinA );
  int readB = trippleRead( pinB );
  int readC = trippleRead( pinC );

  if ( readA == HIGH || readB == HIGH || readC == HIGH ) {
    digitalWrite( 13, HIGH );
  } else {
    digitalWrite( 13, LOW );
  }

  if ( readA != lastA && readA == HIGH ) {
    a++;
    changed = true;
  }

  if ( readB != lastB && readB == HIGH ) {
    b++;
    changed = true;
  }

  if ( readC != lastC && readC == HIGH ) {
    c++;
    changed = true;
  }

  if (changed) printNumbers( a, b, c );

  lastA = readA;
  lastB = readB;
  lastC = readC;

}

void printNumbers( int a, int b, int c ) {
  lcd.setCursor(0,0);
  lcd.print(a);
  lcd.setCursor(4,0);
  lcd.print(b);
  lcd.setCursor(0, 1);
  lcd.print(c);
}

int trippleRead( int pin ) {

  int r1 = digitalRead( pin );
  delay(10);
  int r2 = digitalRead( pin );
  delay(10);
  int r3 = digitalRead( pin );

  return ( r1 == HIGH && r2 == HIGH && r3 == HIGH ? HIGH : LOW );  

}