const int ldG=3;
const int ldR=4;
const int ldB=2;

void setup() {
  pinMode(ldR, OUTPUT);
  pinMode(ldG, OUTPUT);
   pinMode(ldB, OUTPUT);
}

void loop() {
  digitalWrite(ldR,HIGH);
  delay(2000);
  digitalWrite(ldR,LOW);
  delay(100);
  digitalWrite(ldG,HIGH);
  delay(2000);
  digitalWrite(ldG,LOW);
  delay(100);
  digitalWrite(ldB,HIGH);
  delay(2000);
  digitalWrite(ldB,LOW);
  delay(100);
}