#define LED1 PA2
#define LED2 PA3
#define LED3 PA4

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}

void loop() {
  // LED1 blink 200ms
  digitalWrite(LED1, HIGH);
  delay(500);
  digitalWrite(LED1, LOW);
  delay(500);
  // LED2 blink 400ms
  digitalWrite(LED2, HIGH);
  delay(600);
  digitalWrite(LED2, LOW);
  delay(600);
  // LED3 blink 700ms
  digitalWrite(LED3, HIGH);
  delay(700);
  digitalWrite(LED3, LOW);
  delay(700);
}