#include <stdlib.h>

int pins[3] = {25, 26, 27};
void setup() {
  int* arr = (int*) malloc(10 * sizeof(int));
  Serial.begin(115200);
  
 
  for(int x = 0; x < (sizeof(pins) / sizeof(pins[0])); x++) {
    pinMode(pins[x], OUTPUT);
  }
}

void loop() {
  bool analog = true;
  
  while (true) {
    int x = 0;
    unsigned long int current_time;

    while (x < sizeof(pins) / sizeof(pins[3])) {
      if (millis() - current_time > 200) {
        current_time = millis();
        digitalWrite(pins[x], analog);
        x++;
        }
      }
    analog = !analog;
  }

}