Hi, I'm multiplexing some led, so I started with 4 * 4, anode in \ cathode in \ with 1k resistor and I'm using an 74hc164n chip, so I use only 2 pin to control each one but between each shift out all led light up (very low intensity but I still can see them lighten).
int dataPin=11;
int clockPin=12;
int del = 350;
int aA = B00010001;
int aB = B00010010;
int aC = B00010100;
int aD = B00011000;
int bA = B00100001;
int bB = B00100010;
int bC = B00100100;
int bD = B00101000;
int cA = B01000001;
int cB = B01000010;
int cC = B01000100;
int cD = B01001000;
int dA = B10000001;
int dB = B10000010;
int dC = B10000100;
int dD = B10001000;
void setup(){
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
}
void loop(){
shiftOut(dataPin, clockPin, LSBFIRST, aA);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, aB);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, aC);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, aD);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, bA);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, bB);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, bC);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, bD);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, cA);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, cB);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, cC);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, cD);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, dA);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, dB);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, dC);
delay(del);
shiftOut(dataPin, clockPin, LSBFIRST, dD);
delay(del);
}