const int minDistance = 10; // Minimum distance in cm
const int maxDistance = 40;
const int trigPin = 32;
const int echoPin = 33; // Maximum distance in cm

void setup() {
  Serial.begin(9600); // Initialize serial communication
    pinMode(trigPin, OUTPUT);
      pinMode(echoPin, INPUT);
      }

      void loop() {
        // Trigger the ultrasonic sensor
          digitalWrite(trigPin, LOW);
            delayMicroseconds(2);
              digitalWrite(trigPin, HIGH);
                delayMicroseconds(10);
                  digitalWrite(trigPin, LOW);

                    // Read the echo pulse duration in microseconds
                      long duration = pulseIn(echoPin, HIGH);

                        // Calculate the distance in centimeters
                          float distance_cm = (duration / 2) / 29.1;

                            // Map the distance to a percentage value
                              int percentage = map(distance_cm, minDistance, maxDistance, 0, 100);

                                // Ensure the percentage stays within the 0-100 range
                                  percentage = constrain(percentage, 0, 100);

                                    // Print the distance and percentage
                                      Serial.print("Distance: ");
                                        Serial.print(distance_cm);
                                          Serial.print(" cm, Percentage: ");
                                            Serial.print(percentage);
                                              Serial.println("%");

                                                // Delay for some time before the next reading
                                                  delay(500);
                                                  }