7SegmentArduKit.ino

#include "TimerOne.h"

int D1 = 8;
int D2 = 9;
int D3 = 10;
int D4 = 11;

int CommonAK = 2; // Common Anode set to 1, Common Cathode set to 2

int num[] = { 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F };
int OnDigi = 0;
int NumberDisplay = 0;
bool ColonShow = false;

void setup() {
  // put your setup code here, to run once:
  Begin7Segment4Digi();
  NumberDisplay = 0;
}

void loop() {
  NumberDisplay = analogRead(A0);
  delay(100);
}

void Begin7Segment4Digi() {
  DDRD  = 0xFF;
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
  pinMode(D3, OUTPUT);
  pinMode(D4, OUTPUT);
  digitalWrite(D1, LOW);
  digitalWrite(D2, LOW);
  digitalWrite(D3, LOW);
  digitalWrite(D4, LOW);
  Timer1.initialize(1000); // 1000 = 1mS
  Timer1.attachInterrupt(NextDigi);
}

void NextDigi() {
  digitalWrite(D1, LOW);
  digitalWrite(D2, LOW);
  digitalWrite(D3, LOW);
  digitalWrite(D4, LOW);
  int ShowOn = 0;
  OnDigi = (OnDigi==4 ? 1 : OnDigi+1);
  if (OnDigi==1) {
    if (NumberDisplay<10)
      ShowOn = NumberDisplay;

    else
      ShowOn = NumberDisplay%10;
  } else if (OnDigi==2) {
    if (NumberDisplay<10)
      ShowOn = 0;
    if (NumberDisplay<100)
      ShowOn = NumberDisplay/10;
    if (NumberDisplay<1000)
      ShowOn = (NumberDisplay/10)%10;
    if (NumberDisplay<10000)
      ShowOn = (NumberDisplay/10)%10;
  } else if (OnDigi==3) {
    ShowOn = (NumberDisplay / 100) % 10;
  } else if (OnDigi==4) {
    ShowOn = NumberDisplay / 1000;
  }

  if (CommonAK==1)
    PORTD = ~((num[ShowOn])|(ColonShow&&OnDigi==3 ? 0x80 : 0));
  else
    PORTD = ((num[ShowOn])|(ColonShow&&OnDigi==3 ? 0x80 : 0));
  if (OnDigi==1) {
    /*digitalWrite(D1, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D2, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D3, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D4, (CommonAK==1 ? HIGH : LOW));*/
    digitalWrite(D1, LOW);
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);
    digitalWrite(D4, HIGH);
  } else if (OnDigi==2) {
    /*digitalWrite(D1, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D2, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D3, (CommonAK==1 ? HIGH : LOW));
    digitalWrite(D4, (CommonAK==1 ? LOW : HIGH));*/
    digitalWrite(D1, LOW);
    digitalWrite(D2, LOW);
    digitalWrite(D3, HIGH);
    digitalWrite(D4, LOW);
  } else if (OnDigi==3) {
    /*digitalWrite(D1, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D2, (CommonAK==1 ? HIGH : LOW));
    digitalWrite(D3, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D4, (CommonAK==1 ? LOW : HIGH));*/
    digitalWrite(D1, LOW);
    digitalWrite(D2, HIGH);
    digitalWrite(D3, LOW);
    digitalWrite(D4, LOW);
  } else if (OnDigi==4) {
    /*digitalWrite(D1, (CommonAK==1 ? HIGH : LOW));
    digitalWrite(D2, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D3, (CommonAK==1 ? LOW : HIGH));
    digitalWrite(D4, (CommonAK==1 ? LOW : HIGH));*/
    digitalWrite(D1, HIGH);
    digitalWrite(D2, LOW);
    digitalWrite(D3, LOW);
    digitalWrite(D4, LOW);
  }

}