// 4 digits 7-segment display CC
int seg[7] = {2, 3, 4, 5, 6, 7, 8};
/*
seg[0] = seg a = port 2 van Arduino Uno
seg[1] = seg b = port 3
seg[2] = seg c = port 4
seg[3] = seg d = port 5
seg[4] = seg e = port 6
seg[5] = seg f = port 7
seg[6] = seg g = port 8
*/
int CC[4] = {9, 10, 11, 12};
/*
CC[0] = port 9 van Arduino Uno = LSD (rightmost) CC=Common Cathode
CC[1] = port 10
CC[2] = port 11
CC[3] = port 12 = MSD (leftmost)
*/
byte onDisplay[16] =
{
// bits 6543210
// segments gfedcba
 0b0111111, //0
 0b0000110, //1
 0b1011011, //2
 0b1001111, //3
 0b1100110, //4
 0b1101101, //5
 0b1111101, //6
 0b0000111, //7
 0b1111111, //8
 0b1101111, //9
 0b1110111, //A
 0b1111100, //b
 0b0111001, //C
 0b1011110, //d
 0b1111001, //E
 0b1110001, //F
} ;
void setup()
{
for (int i=0;i<=6;i++){pinMode(seg[i], OUTPUT);};
for (int i=0;i<=3;i++){pinMode(CC[i], OUTPUT);};
}
void toonCijfer(int cijfer) {
 for (int i=0;i<=6;i++)
 {
 digitalWrite(seg[i],bitRead(onDisplay[cijfer],i));
 }
}
void loop() {


}