int LEDpin1=13;
int LEDpin2=12;
int LEDpin3=10;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
  pinMode(LEDpin1,OUTPUT);
  pinMode(LEDpin2, OUTPUT);
  pinMode(LEDpin3, OUTPUT);
  
}

void loop() {
  digitalWrite(LEDpin1, HIGH);
  delay(1000);
  digitalWrite(LEDpin2,HIGH);
  delay(1000);
  digitalWrite(LEDpin3, HIGH);
  delay(1000);
  digitalWrite(LEDpin1, LOW);
   digitalWrite(LEDpin2, LOW);
    digitalWrite(LEDpin3, LOW);
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
}