// Benjamin Emereau 08/03/2024
bool powerstate = false; // "Bool variable to store power state (ON/OFF)"
String inputString; // "Temporary variable to read user input"
int ledPin = 8; // "Pin number for the LED (D1)"

void setup() {
  Serial.begin(115200); // "Serial communication setup"
  // "User instructions for controlling the LED via terminal"
  Serial.println("Welcome! This ESP32 controls an LED.");
  Serial.println("Type 'ON' in the terminal to turn the LED on.");
  Serial.println("Type 'OFF' in the terminal to turn the LED off.");
  pinMode(ledPin, OUTPUT); // "Set the LED pin as output"
}

void loop() {
  if (Serial.available()) { // "Check if serial input is available"
    inputString = Serial.readStringUntil('\n'); // "Read user input"
    Serial.println(inputString); // "Echo user input"
    if (inputString == "ON") {
      powerstate = true; // "Turn LED on"
      Serial.println("LED turned ON");
    } else if (inputString == "OFF") {
      powerstate = false; // "Turn LED off"
      Serial.println("LED turned OFF");
    }
    if (powerstate) {
      digitalWrite(ledPin, HIGH); // "Set LED pin high"
    } else {
      digitalWrite(ledPin, LOW); // "Set LED pin low"
    }
  }
}