void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, STM32!");
    digitalWrite(PB10, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

  // digitalWrite(PB10, LOW);
  // digitalWrite(D3, HIGH);
  // digitalWrite(D4, HIGH);
  // delay(500); // this speeds up the simulation
  // digitalWrite(D2, HIGH);
  // digitalWrite(D3, LOW);
  // digitalWrite(D4, HIGH);
  // delay(500); // this speeds up the simulation
  // digitalWrite(D2, HIGH);
  // digitalWrite(D3, HIGH);
  // digitalWrite(D4, LOW);
  // delay(500); // this speeds up the simulation
}