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	- Project: Ultrasonic Detection
	- Source Code NOT compiled for: Arduino Nano 33 BLE
	- Source Code created on: 2025-11-05 11:48:22

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Use the Ultrasonic library with HC-SR04 sensor */
	/* connected to digital pins D2 (Trigger) and D3 */
	/* (Echo) on Arduino Nano 33 BLE for obstacle */
	/* detection, allowing system actions based on */
	/* measured distance values. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

// Project code for obstacle detection using HC-SR04 ultrasonic sensor
// connected to digital pins D2 (Trigger) and D3 (Echo) on Arduino Nano 33 BLE
// System Requirements:
// Use the Ultrasonic library with HC-SR04 sensor at pins D2 and D3
// Detect obstacles and perform system actions based on distance measurements

#include <Ultrasonic.h>

// Define the ultrasonic sensor pins
const uint8_t ultrasonic_sensor_HC_SR04_Echo_PIN_D3 = 3;
const uint8_t ultrasonic_sensor_HC_SR04_Trigger_PIN_D2 = 2;

// Create an instance of Ultrasonic class with echo and trigger pins
Ultrasonic ultrasonicSensor(ultrasonic_sensor_HC_SR04_Trigger_PIN_D2, ultrasonic_sensor_HC_SR04_Echo_PIN_D3);

// Threshold distance in centimeters to consider an obstacle
const float obstacleThresholdCm = 20.0; // 20 cm

void setup() {
  // Initialize serial communication at 9600 baud
  Serial.begin(9600);

  // Configure the pin modes
  pinMode(ultrasonic_sensor_HC_SR04_Echo_PIN_D3, INPUT);
  pinMode(ultrasonic_sensor_HC_SR04_Trigger_PIN_D2, OUTPUT);
}

void loop() {
  // Read the distance from the ultrasonic sensor
  float distanceCm = ultrasonicSensor.read();

  // Output the distance value
  Serial.print("Distance: ");
  Serial.print(distanceCm);
  Serial.println(" cm");

  // Check if an obstacle is detected within the threshold distance
  if (distanceCm > 0 && distanceCm < obstacleThresholdCm) {
    // Obstacle detected - perform system action
    Serial.println("Obstacle detected! Taking action.");
    // Example action: turn on an LED or trigger other system responses
    // digitalWrite(LED_BUILTIN, HIGH); // Uncomment if using an onboard LED
  } else {
    // No obstacle - system is clear
    // digitalWrite(LED_BUILTIN, LOW); // Uncomment if using an onboard LED
  }

  // Wait for 200 milliseconds before next reading
  delay(200);
}

/* END CODE */