#define LIMIT_SWITCH_PIN 7  // Pin for the push button
#define LED_PIN 13          // Pin for an optional LED

unsigned long buttonPressTime = 0;  // Time when the button is pressed
unsigned long depthLevel = 0;       // Variable to store the depth level (duration of button press)
bool buttonState = false;           // Current button state
bool lastButtonState = false;       // Previous button state

void setup() {
  pinMode(LIMIT_SWITCH_PIN, INPUT_PULLUP); // Use internal pull-up resistor for the push button
  pinMode(LED_PIN, OUTPUT);                // Set LED pin as output
  Serial.begin(9600);                      // Start serial monitor
}

void loop() {
  // Read the button state
  buttonState = digitalRead(LIMIT_SWITCH_PIN) == LOW;

  // Check for button press event
  if (buttonState && !lastButtonState) {
    buttonPressTime = millis();  // Start timing when the button is pressed
  }

  // If the button is being pressed, calculate the "depth" based on how long it’s held
  if (buttonState) {
    depthLevel = millis() - buttonPressTime; // Calculate depth based on press duration
    depthLevel = constrain(depthLevel, 0, 1000);  // Limit depth to a maximum value (e.g., 1 second)
  }

  // If the button is released, display the depth and control LED brightness
  if (!buttonState && lastButtonState) {
    Serial.print("Depth level: ");
    Serial.println(depthLevel);  // Show the "depth" on the Serial Monitor
    analogWrite(LED_PIN, map(depthLevel, 0, 1000, 0, 255)); // Adjust LED brightness based on depth
  }

  // Store the current button state for the next loop
  lastButtonState = buttonState;

  delay(50);  // Small delay for debounce
}