I want to be helped please, my project is a track where is a chronometer start when a captor detect the vehicle at the beginning and stop when it arrive !
So i have made the track etc.. but i want the display to show directly via 4 digits 7 seg the time in millis, i need a help just for the part of the digit : i don't know how display the number wanted at the right place. I just want to learn how display the good number when i press the '7' for example.. After for the rest i think i try alone but a help is not rejected !!
Perhaps this example will help. Segments are connected to pins 5 through 12. Digits are connected to pins 14, 2, 3, and 4.
// Digit select lines, right to left
#define DIGIT4 14Â // LSD
#define DIGIT3 2
#define DIGIT2 3
#define DIGIT1 4Â // MSD
// Bit maps for the seven segment display
const unsigned char Segments[] =
{
 0b11000000, // 0
 0b11001111, // 1
 0b10100100, // 2
 0b10000110, // 3
 0b10001011, // 4
 0b10010010, // 5
 0b10010000, // 6
 0b11000111, // 7
 0b10000000, // 8
 0b10000011, // 9
};
// List of digit select lines, least significant digit first
const unsigned char Digits[4] = {
 DIGIT4, DIGIT3, DIGIT2, DIGIT1};
void setup()
{
 for (int i=2; i<15; i++)
 {
  pinMode(i,OUTPUT);
  digitalWrite(i,LOW);
 }
 digitalWrite(12, HIGH);
 digitalWrite(13, HIGH);
}
void loop()
{
 // Get time since last reset
 int clock;
////////Â Set 'clock' to the 4-digit integer to be displayed
 // Display each digit, right to left
 for (int i=0; i<4; i++)
 {
 Â
  // Peel a digit off the low end of the number
  int digit = clock % 10;
  clock /= 10;
 Â
  // Blank the MSD if it is zero
  if (i==3 && digit == 0)
  {
   for (int s=5; s<12; s++)
    digitalWrite(s,HIGH);
  }
  else
  {
   // Display the digit on the seven segments
   unsigned char segments = Segments[digit];
   for (int s=5; s<12; s++)
   {
    digitalWrite(s,segments & 1);
    segments >>= 1;
   }
  }
  // Turn on the digit briefly
  digitalWrite(Digits[i], HIGH); // Select one digit
  delay(3);
  digitalWrite(Digits[i], LOW);
 }
}
