4 relays controlled with ESP8266

const int relay1 = 5;  // D1
const int relay2 = 4;  // D2
const int relay3 = 0;  // D3
const int relay4 = 2;  // D4

void setup()
{
     pinMode(relay1, OUTPUT);
     pinMode(relay2, OUTPUT);
     pinMode(relay3, OUTPUT);
     pinMode(relay4, OUTPUT);
}

void loop()
{
  digitalWrite(relay1, LOW);
  delay(1000);
  digitalWrite(relay2, LOW);
  delay(1000);
  digitalWrite(relay3, LOW);
  delay(1000);
  digitalWrite(relay4, LOW);
  delay(1000);
  digitalWrite(relay4, HIGH);
  delay(1000);
  digitalWrite(relay3, HIGH);
  delay(1000);
  digitalWrite(relay2, HIGH);
  delay(1000);
  digitalWrite(relay1, HIGH);
  delay(1000);
}