arduino_clock.c

int ledPin = 0 ;
int catPin = 8 ;
int buttonUp = 14 ;
int buttonDown = 15 ;

int number = 0 ;

unsigned long time, oldTime ;

int numbers[10][8]={{HIGH,HIGH,HIGH,HIGH,HIGH,HIGH,LOW,LOW},
                    {LOW,HIGH,HIGH,LOW,LOW,LOW,LOW,LOW},
                    {HIGH,HIGH,LOW,HIGH,HIGH,LOW,HIGH,LOW},
                    {HIGH,HIGH,HIGH,HIGH,LOW,LOW,HIGH,LOW},
                    {LOW,HIGH,HIGH,LOW,LOW,HIGH,HIGH,LOW},
                    {HIGH,LOW,HIGH,HIGH,LOW,HIGH,HIGH,LOW},
                    {HIGH,LOW,HIGH,HIGH,HIGH,HIGH,HIGH,LOW},
                    {HIGH,HIGH,HIGH,LOW,LOW,LOW,LOW,LOW},
                    {HIGH,HIGH,HIGH,HIGH,HIGH,HIGH,HIGH,LOW},
                    {HIGH,HIGH,HIGH,HIGH,LOW,HIGH,HIGH,LOW}};

void writeDigit(int index, int digit)
  {
  reset() ;
  int cathode = catPin + index ;
    
  for (int i=0; i<8 ; i++)
    digitalWrite(ledPin + i, numbers[digit][i]) ;
      
  digitalWrite(cathode, LOW) ;   
  }
  
void reset() 
  {
  for (int i=0 ; i<5 ; i++)
    digitalWrite(catPin + i, HIGH) ;
    
  for (int i=0 ; i<8 ; i++)
    digitalWrite(ledPin + i, LOW) ;
  }  
  
void writeDots()
  {
  reset() ;
  digitalWrite(ledPin, HIGH) ;
  digitalWrite(ledPin+1, HIGH) ;
  
  digitalWrite(catPin+4, (millis()/1000)%2) ;

  reset() ;
  }

void writeNumber(int number)
  {
  number = number%10000 ;
  writeDigit(0, number/1000) ;
  
  number = number%1000 ;
  writeDigit(1, number/100) ;
  
  number = number%100 ;
  writeDigit(2, number/10) ;
  
  number = number%10 ;
  writeDigit(3, number) ;
  
  writeDots() ;
  }
  
void writeTime(unsigned long time)
  {
  int seconds = time % 60 ;

  time = time % 86400 ;
  
  int hours = (time/3600) ;
  int minutes = (time/60) - hours*60 ;

  writeNumber(hours*100 + minutes) ;
  }
  
unsigned long timeInSeconds(int hours, int minutes, int seconds)
  {
  unsigned long sTime = (unsigned long)seconds + 60*(unsigned long)minutes + 3600*(unsigned long)hours ;
  return sTime ; 
  }

void display()
  {
  writeNumber(0) ;
  }
  
void setupPins()
  {
  for (int i=ledPin; i < ledPin + 8 ; i++)
    {
    pinMode(i, OUTPUT) ;
    }
  
  for (int i=catPin; i < catPin + 5 ; i++)
    {
    pinMode(i, OUTPUT) ;
    digitalWrite(i, HIGH) ;
    }
    
  pinMode(buttonUp, INPUT) ;
  }

void setup()
  {
  setupPins() ;  
  reset() ;
  time = timeInSeconds(22,8,0) ;
//  Serial.begin(9600);
  }

void loop()
  {
  if (digitalRead(buttonUp) == HIGH)
    {
    if (millis() > oldTime + 200)
      {  
      time += 60 ;
      oldTime = millis() ;
      }
    }
    
  if (digitalRead(buttonDown) == HIGH)
    {
    if (millis() > oldTime + 200)
      {  
      time -= 60 ;
      oldTime = millis() ;
      }
    }
    
    
//  Serial.print("Hello\n") ;     
  writeTime(time + millis()/1000) ;
  }