DIY digital clock at home|| how to make a digital clock||Lucifer||the robotics guy

Code for the Arduino 👇 

// set current time by editing the values at line 16 and 17

const int clock = 7;

const int data = 8;

uint8_t digits[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f };

void setup()

{

  setupInterrupt();

  pinMode(clock, OUTPUT);

  pinMode(data, OUTPUT);

  start();

  writeValue(0x8c);

  stop();

  write(0x00, 0x00, 0x00, 0x00);

}

byte tcnt2;

  unsigned long int setMinutes = 22;

  unsigned long int setHours = 15;

  unsigned long time = (setMinutes * 60 * 1000) + (setHours * 3600 *1000);

void setupInterrupt()

{

  TIMSK2 &= ~(1<<TOIE2);

  TCCR2A &= ~((1<<WGM21) | (1<<WGM20));

  TCCR2B &= ~(1<<WGM22);

  ASSR &= ~(1<<AS2);

  TIMSK2 &= ~(1<<OCIE2A);

  TCCR2B |= (1<<CS22) | (1<<CS20); 

  TCCR2B &= ~(1<<CS21);

  tcnt2 = 131;

  TCNT2 = tcnt2;

  TIMSK2 |= (1<<TOIE2);

}

ISR(TIMER2_OVF_vect) {

  TCNT2 = tcnt2;

  time++;

  time = time % 86400000;

}

void loop()

{

  unsigned long t = (unsigned long)(time/1000);

  uint8_t minutes = (byte)((t / 60) % 60);

  uint8_t hours = (byte)((t / 3600) % 24);

  uint8_t seconds = (byte)(t % 60);

    write(digits[hours / 10], digits[hours % 10] | ((seconds & 0x01) << 7), digits[minutes / 10], digits[minutes % 10]);

}

void write(uint8_t first, uint8_t second, uint8_t third, uint8_t fourth)

{

  start();

  writeValue(0x40);

  stop();

  start();

  writeValue(0xc0);

  writeValue(first);

  writeValue(second);

  writeValue(third);

  writeValue(fourth);

  stop();

}

void start(void)

{

  digitalWrite(clock,HIGH);

  digitalWrite(data,HIGH);

  delayMicroseconds(5);

  digitalWrite(data,LOW);

  digitalWrite(clock,LOW);

  delayMicroseconds(5);

}

void stop(void)

{

  digitalWrite(clock,LOW);

  digitalWrite(data,LOW);

  delayMicroseconds(5);

  digitalWrite(clock,HIGH);

  digitalWrite(data,HIGH);

  delayMicroseconds(5);

}

bool writeValue(uint8_t value)

{

  for(uint8_t i = 0; i < 8; i++)

  {

    digitalWrite(clock, LOW);

    delayMicroseconds(5);

    digitalWrite(data, (value & (1 << i)) >> i);

    delayMicroseconds(5);

    digitalWrite(clock, HIGH);

    delayMicroseconds(5);

  }

  digitalWrite(clock,LOW);

  delayMicroseconds(5);

  pinMode(data,INPUT);

  digitalWrite(clock,HIGH);

  delayMicroseconds(5);

  bool ack = digitalRead(data) == 0;

  pinMode(data,OUTPUT);

  return ack;

}

Circuit diagram 👇👇👇

circuit diagram 🔝🔝🔝