int LED1 = 2;
  int LED2 = 3;
  int LED3 = 4;
  int LED4 = 5;
  int LED5 = 6;
  int LED6 = 7;
  int LED7 = 8;
  int LED8 = 9;
  int LED9 = 10;
  int LED10 = 11;
  int LED11 = 12;
  int LED12 = A1;
  int LED13 = A2;
  int LED14 = A3;
  int LED15 = A4;
  int LED16 = A5;

  int sensorPin = A0;
  unsigned int n,ADCvalue,propeller_posn;
  unsigned long previousTime = 0;
  byte hours = 12; //
  set hours byte minutes = 15;//
  set minutes byte seconds = 00; //
  set seconds

  int val; void setup()
  {
  pinMode(LED2,OUTPUT);
  pinMode(LED3,OUTPUT);
  pinMode(LED4,OUTPUT);
  pinMode(LED5,OUTPUT);
  pinMode(LED6,OUTPUT);
  pinMode(LED7,OUTPUT);
  pinMode(LED8,OUTPUT);
  pinMode(LED9,OUTPUT);
  pinMode(LED10,OUTPUT);
  pinMode(LED11,OUTPUT);
  pinMode(LED12,OUTPUT);
  pinMode(LED13,OUTPUT);
  pinMode(LED14,OUTPUT);
  pinMode(LED15,OUTPUT);
  pinMode(LED16,OUTPUT);
  pinMode(sensorPin,INPUT_PULLUP);
  
  if(hours == 12) hours = 0;
   } 
   void loop()
   { 
    val = digitalRead(sensorPin); 
    while (val == LOW) 
    { 
   val= digitalRead(sensorPin); } if (millis() >= (previousTime)) { previousTime = previousTime + 1000; seconds = seconds+1; if (seconds == 60) { seconds = 0; minutes = minutes+1; } if (minutes == 60) { minutes = 0; hours = hours+1; } if (hours == 12) { hours = 0; } } propeller_posn=30; n=0; while(n < 60) { drawMinuteMarker(); if ((propeller_posn==0) || (propeller_posn==5) || (propeller_posn==10) || (propeller_posn==15) || (propeller_posn==20) || (propeller_posn==25) || (propeller_posn==30) || (propeller_posn==35) || (propeller_posn==40) || (propeller_posn==45) || (propeller_posn==50) || (propeller_posn==55)) drawHourMarker(); if ((propeller_posn==0) || (propeller_posn==15) || (propeller_posn==30) || (propeller_posn==45)) drawQuarterMarker(); if((propeller_posn == hours*5) || (( propeller_posn == 0 ) && (hours == 0))) drawHoursHand(); if(propeller_posn == minutes) drawMinutesHand(); if(propeller_posn == seconds) drawSecondsHand(); delayMicroseconds(140); // for LED pixel width (change the value according to motor speed. Increase for low speed, decrease for high speed motor) displayClear(); drawInner_Circle(); delayMicroseconds(600); // for the gap between LED pixels/minutes markers (change the value according to motor speed. Increase for low speed, decrease for high speed motor) n++; propeller_posn++; if(propeller_posn == 60) propeller_posn=0; } val = digitalRead(sensorPin); while (val == HIGH) { val = digitalRead(sensorPin); } } //========================= void displayClear() { digitalWrite(LED1,LOW); digitalWrite(LED2,LOW); digitalWrite(LED3,LOW); digitalWrite(LED4,LOW); digitalWrite(LED5,LOW); digitalWrite(LED6,LOW); digitalWrite(LED7,LOW); digitalWrite(LED8,LOW); digitalWrite(LED9,LOW); digitalWrite(LED10,LOW); digitalWrite(LED11,LOW); digitalWrite(LED12,LOW); digitalWrite(LED13,LOW); digitalWrite(LED14,LOW); digitalWrite(LED15,LOW); digitalWrite(LED16,LOW); } void drawMinuteMarker() { digitalWrite(LED16,HIGH); } void drawHourMarker() { digitalWrite(LED15,HIGH); digitalWrite(LED14,HIGH); } void drawQuarterMarker() { digitalWrite(LED13,HIGH); digitalWrite(LED12,HIGH); } void drawHoursHand() { digitalWrite(LED1,HIGH); digitalWrite(LED2,HIGH); digitalWrite(LED3,HIGH); digitalWrite(LED4,HIGH); digitalWrite(LED5,HIGH); digitalWrite(LED6,HIGH); digitalWrite(LED7,HIGH); } void drawMinutesHand() { digitalWrite(LED1,HIGH); digitalWrite(LED2,HIGH); digitalWrite(LED3,HIGH); digitalWrite(LED4,HIGH); digitalWrite(LED5,HIGH); digitalWrite(LED6,HIGH); digitalWrite(LED7,HIGH); digitalWrite(LED8,HIGH); digitalWrite(LED9,HIGH); } void drawSecondsHand() { digitalWrite(LED1,HIGH); digitalWrite(LED2,HIGH); digitalWrite(LED3,HIGH); digitalWrite(LED4,HIGH); digitalWrite(LED5,HIGH); digitalWrite(LED6,HIGH); digitalWrite(LED7,HIGH); digitalWrite(LED8,HIGH); digitalWrite(LED9,HIGH); digitalWrite(LED10,HIGH); digitalWrite(LED11,HIGH); } void drawInner_Circle() { digitalWrite(LED1,HIGH); delayMicroseconds(30); digitalWrite(LED1,LOW); }