#define Q0 2
#define Q1 3
#define Q2 4
#define Q3 5
#define Q4 6
#define Q5 7
#define Q6 8
#define Q7 9
#define CLKCONTROL 10

#define CLK 13

void writeOut(uint8_t data) {  // min 0 , MAX 255
  // decimal to binary
  for(uint8_t i = 0; i <= 7; i++) {
    digitalWrite(Q0 + i, data & 1 );    // 01010101 AND 00000001 = 1
    data = data >> 1;                   // 00101010, bit right shift
  }

}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  digitalWrite(CLK, LOW);

  for(uint8_t pin = Q0; pin <= Q7; pin++) {
    pinMode(pin, OUTPUT);
  }

  pinMode(CLK, OUTPUT);
  pinMode(CLKCONTROL, INPUT);

}

uint16_t times = 400;

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 0; i <= 255; i++) {
    if(digitalRead(CLKCONTROL) == HIGH) {times = map(analogRead(A0), 0, 1024, 10, 500);}
    else {times = 400;}
    Serial.println(times);
    writeOut(i);
    digitalWrite(CLK, HIGH);
    delay(times); //Duty 0n
    digitalWrite(CLK, LOW);
    delay(times); //Duty off
  }

}