#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL343.h>

#define LED_PIN 1  // your LED pin

TwoWire I2CBus = TwoWire(0);
Adafruit_ADXL343 accel = Adafruit_ADXL343(12345, &I2CBus);

// store previous readings
float lastX = 0, lastY = 0, lastZ = 0;

// movement sensitivity threshold
const float threshold = 2.5;  // adjust this value for sensitivity

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(115200);
  while (!Serial);

  I2CBus.begin(5, 6);  // SDA = GPIO5, SCL = GPIO6

  if (!accel.begin(0x1D)) { // your detected I2C address
    Serial.println("No ADXL343 detected. Check wiring!");
    while(1);
  }

  // initialize last readings
  sensors_event_t event;
  accel.getEvent(&event);
  lastX = event.acceleration.x;
  lastY = event.acceleration.y;
  lastZ = event.acceleration.z;

  Serial.println("ADXL343 detected!");
}

void loop() {
  sensors_event_t event;
  accel.getEvent(&event);

  // calculate total movement from previous readings
  float dx = abs(event.acceleration.x - lastX);
  float dy = abs(event.acceleration.y - lastY);
  float dz = abs(event.acceleration.z - lastZ);
  float movement = dx + dy + dz;

  if (movement > threshold) {
    digitalWrite(LED_PIN, HIGH);  // turn LED on
    delay(50);                     // short blink
    digitalWrite(LED_PIN, LOW);   // turn LED off
  }

  // update last readings
  lastX = event.acceleration.x;
  lastY = event.acceleration.y;
  lastZ = event.acceleration.z;

  delay(50);  // small delay to avoid flooding
}