const unsigned long interval_r = 1000;
const unsigned long interval_b = 300; 
const unsigned long interval_g = 500;  
unsigned long predmiles_r;
unsigned long predmiles_b;
unsigned long predmiles_g;

void setup() {
  //red
  pinMode(A0, OUTPUT);
  //blue
  pinMode(A3, OUTPUT);
  //green
  pinMode(A4, OUTPUT);
  // blue digital
  pinMode(8, OUTPUT);
  // red digital
  pinMode(9, OUTPUT);
  // green digital
  pinMode(5, OUTPUT);
  Serial.begin(115200);
}


void loop() {
  unsigned long current_miles = millis();  
  // red
  // интервал между текущим и предыдущим сигналом >= заданному интервалу времени
  if (current_miles - predmiles_r >= interval_r)
  {
    predmiles_r = current_miles;
    digitalWrite(A0,!digitalRead(A0));
    digitalWrite(9,!digitalRead(9));
  }
  // blue
  if (current_miles - predmiles_b >= interval_b)
  {
    predmiles_b = current_miles;
    digitalWrite(A3,!digitalRead(A3));
    digitalWrite(8,!digitalRead(8));
  }
  //green
  if (current_miles - predmiles_g >= interval_g)
  {
    predmiles_g = current_miles;
    digitalWrite(A4,!digitalRead(A4));
    digitalWrite(5,!digitalRead(5));
  }
}