4 leds and a button

Projects Programming
19

Okay, here it is:

int pin[4] = {7, 6, 5, 4};
int btn = 8;
unsigned long dt = 250;
unsigned long pt = 0;
int state;
void setup() {
  pinMode(btn,INPUT);
  pinMode(pin[0], OUTPUT);
  pinMode(pin[1], OUTPUT);
  pinMode(pin[2], OUTPUT);
  pinMode(pin[3], OUTPUT);
}
void loop() {
  int g = digitalRead(btn);
  if (g == 0) {
    switch (state) {
      case (0): digitalWrite(pin[0], HIGH);
        break;
      case (1): digitalWrite(pin[0], LOW);
        break;
      case (2): digitalWrite(pin[1], HIGH);
        break;
      case (3): digitalWrite(pin[1], LOW);
        break;
      case (4): digitalWrite(pin[2], HIGH);
        break;
      case (5): digitalWrite(pin[2], LOW);
        break;
      case (6): digitalWrite(pin[3], HIGH);
        break;
      case (7): digitalWrite(pin[3], LOW);
        break;
    }
    if (millis() - pt > dt && state == 0) {
      state = 1;
      pt = millis();
    }
    if (millis() - pt > dt && state == 1) {
      state = 2;
      pt = millis();
    }
    if (millis() - pt > dt && state == 2) {
      state = 3;
      pt = millis();
    }
    if (millis() - pt > dt && state == 3) {
      state = 4;
      pt = millis();
    }
    if (millis() - pt > dt && state == 4) {
      state = 5;
      pt = millis();
    }
    if (millis() - pt > dt && state == 5) {
      state = 6;
      pt = millis();
    }
    if (millis() - pt > dt && state == 6) {
      state = 7;
      pt = millis();
    }
    if (millis() - pt > dt && state == 7) {
      state = 0;
      pt = millis();
    }
  }
  if (g == 1) {
    digitalWrite(pin[0], LOW);
    digitalWrite(pin[1], LOW);
    digitalWrite(pin[2], LOW);
    digitalWrite(pin[3], LOW);
  }
}