Soil Moisture 2.2 LED

I’m using the Arduino IDE to flash the Soil Moisture Sensor. I can’t seem to turn off the LED on GPIO13. Anybody had any experience with this? Here’s the code I’m using:

const int Led = 13; // D7

pinMode(Led, OUTPUT);
digitalWrite(Led, LOW);

I tested the sketch and it works fine

 ESP8266 BlinkWithoutDelay by Simon Peter
 Blink the blue LED on the ESP-01 module
 Based on the Arduino Blink without Delay example
 This example code is in the public domain
 The blue LED on the ESP-01 module is connected to GPIO1 
 (which is also the TXD pin; so we cannot use Serial.print() at the same time)
 Note that this sketch uses LED_BUILTIN to find the pin with the internal LED

int ledState = LOW;     

unsigned long previousMillis = 0;
const long interval = 1000;
const int LED = 13;

void setup() {
  pinMode(LED, OUTPUT);

void loop()
  unsigned long currentMillis = millis();
  if(currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;   
    if (ledState == LOW)
      ledState = HIGH;  // Note that this switches the LED *off*
      ledState = LOW;   // Note that this switches the LED *on*
    digitalWrite(LED, ledState);