#define pinLed 23

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


void loop() {
  for( uint32_t i=150; i<=-10; i--){
    Serial.println(i);
    delay(20);
    if(i == -10)
      digitalWrite(pinLed, HIGH);
  }
}