#include <Wire.h>
#include <MPU6050.h>

MPU6050 mpu;

const int triggerPin = 8;
const int echoPin = 9;
const int buzzerPin = 11;
const int ledPin = 10;

const int fallThreshold = 1500; // Adjust this threshold based on your requirements (empirical testing).
const int objectDetectionDistance = 20; // Adjust the distance for object detection.

void setup() {
  Wire.begin();
  mpu.initialize();
  Serial.begin(9600);
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int16_t ax, ay, az;
  mpu.getAcceleration(ax, ay, az);

  // Calculate the magnitude of acceleration
  float accelerationMagnitude = sqrt(ax * ax + ay * ay + az * az);

  // Read distance from the ultrasonic sensor
  long duration, distance;
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1; // Convert to centimeters.

  // Object detection
  if (distance < objectDetectionDistance) {
    digitalWrite(ledPin, HIGH); // Turn on LED
    digitalWrite(buzzerPin, HIGH); // Turn on Buzzer
    Serial.println("Object detected");
  } else {
    digitalWrite(ledPin, LOW); // Turn off LED
    digitalWrite(buzzerPin, LOW); // Turn off Buzzer
  }

  // Fall detection
  if (accelerationMagnitude > fallThreshold) {
    digitalWrite(ledPin, HIGH); // Turn on LED
    digitalWrite(buzzerPin, HIGH); // Turn on Buzzer
    Serial.println("Fall detected");
  }

  delay(100); // Add a delay to avoid overwhelming the output.
}