#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL345_U.h>

Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);

void displaySensorDetails(void) {
    sensor_t sensor;
    accel.getSensor(&sensor);
    Serial.println("------------------------------------");
    Serial.print("Sensor:       "); Serial.println(sensor.name);
    Serial.print("Driver Ver:   "); Serial.println(sensor.version);
    Serial.print("Unique ID:    "); Serial.println(sensor.sensor_id);
    Serial.print("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" m/s^2");
    Serial.print("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" m/s^2");
    Serial.print("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" m/s^2");
    Serial.println("------------------------------------");
    Serial.println("");
    delay(500);
}

void setup(void) {
    Wire.begin(6, 7);  // SDA = GPIO6, SCL = GPIO7
    Serial.begin(115200);
    while (!Serial);

    Serial.println("Accelerometer Test\n");

    if (!accel.begin(0x53)) {
        Serial.println("❌ Its not detecting the ADXL345... Verify the connections.");
        while (1);
    }

    accel.setRange(ADXL345_RANGE_16_G);
    displaySensorDetails();
}

//without graphic
/*
void loop(void) {
    sensors_event_t event;
    accel.getEvent(&event);

    Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print("  ");
    Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print("  ");
    Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print("  "); 
    Serial.println("m/s^2");

    delay(500);
}
*/

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

    Serial.print("X:"); Serial.print(event.acceleration.x); Serial.print(" ");
    Serial.print("Y:"); Serial.print(event.acceleration.y); Serial.print(" ");
    Serial.print("Z:"); Serial.println(event.acceleration.z);  // Usa println solo en el último valor

    delay(100);
}

Here you can see a demonstrative video with X, Y and Z accelerations:

<video src="acceleration.mp4" width=100% type="video/mp4" controls autoplay muted></video>