#define ledVm 4
#define ledAm 15

void setup() {

  pinMode(ledVm, OUTPUT);
  pinMode(ledAm, OUTPUT);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(ledVm, HIGH);
  digitalWrite(ledAm, LOW);
  delay(1000);
  digitalWrite(ledVm, LOW);
  digitalWrite(ledAm, HIGH);
  delay(1000);
}