gyro-sensor-adxl-345-testing-code

Just a test code for bigginer

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gyro-sensor-adxl-345-testing-code

ESP32 + ADXL345 Accelerometer

Read X, Y, Z acceleration, detect tilt direction, and monitor free fall using an ADXL345 accelerometer with an ESP32 microcontroller.

Components Required

Component Quantity
ESP32 Dev Board 1
ADXL345 Sensor Module 1
Jumper Wires 6
Breadboard (optional) 1

Wiring Diagram (I2C Mode)

ADXL345         ESP32
-------         -----
VCC    ──────►  3.3V
GND    ──────►  GND
SDA    ──────►  GPIO 21
SCL    ──────►  GPIO 22
CS     ──────►  3.3V   (enables I2C mode)
SDO    ──────►  GND    (sets I2C address to 0x53)

Important: Use 3.3V only! The ADXL345 is NOT 5V tolerant.
Connect CS to 3.3V to enable I2C mode (floating CS defaults to SPI).
SDO to GND sets I2C address 0x53. SDO to 3.3V sets address 0x1D.

Setup & Installation

1. Install Arduino IDE

Download from arduino.cc

2. Add ESP32 Board Support

  1. Open Arduino IDE → File → Preferences
  2. Add this URL to Additional Boards Manager URLs: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
  3. Go to Tools → Board → Boards Manager
  4. Search for esp32 and click Install

3. Install Required Libraries

  1. Go to Sketch → Include Library → Manage Libraries
  2. Search and install the following:
    • Adafruit ADXL345 by Adafruit
    • Adafruit Unified Sensor by Adafruit

4. Upload the Sketch

  1. Open adxl345_esp32.ino in Arduino IDE
  2. Select your board: Tools → Board → ESP32 Dev Module
  3. Select the correct Port under Tools → Port
  4. Click Upload

Serial Monitor Output

Open Serial Monitor at 115200 baud to see live readings:

=================================
  ESP32 + ADXL345 Sensor Demo   
=================================
Sensor Name : ADXL345
Max Range   : 156.96 m/s^2
Resolution  : 0.04 m/s^2
---------------------------------
ADXL345 initialized successfully!

--- Accelerometer Readings ---
X Axis    : 0.1570 m/s^2
Y Axis    : -0.3530 m/s^2
Z Axis    : 9.7340 m/s^2
Magnitude : 9.7467 m/s^2
Tilt      : Flat / Level
------------------------------

Configuration

Measurement Range

Change sensitivity range in the code:

accel.setRange(ADXL345_RANGE_2_G);   // ±2g  — most sensitive (default)
accel.setRange(ADXL345_RANGE_4_G);   // ±4g
accel.setRange(ADXL345_RANGE_8_G);   // ±8g
accel.setRange(ADXL345_RANGE_16_G);  // ±16g — least sensitive

Data Rate

Change how frequently the sensor samples:

accel.setDataRate(ADXL345_DATARATE_100_HZ);  // 100 samples/sec (default)
accel.setDataRate(ADXL345_DATARATE_200_HZ);  // 200 samples/sec
accel.setDataRate(ADXL345_DATARATE_50_HZ);   // 50 samples/sec

Features

Feature Description
X / Y / Z Axes Raw acceleration in m/s²
Magnitude Total vector magnitude of acceleration
Tilt Detection Detects Left, Right, Forward, Backward, Upside Down, Flat
Free Fall Detection Triggers when total magnitude drops below 2 m/s²

Troubleshooting

Problem Solution
ADXL345 sensor not found! Check CS → 3.3V and SDO → GND; verify SDA/SCL pins
Garbage in Serial Monitor Set baud rate to 115200
All values read 0.0 CS pin might be floating — connect firmly to 3.3V
Board not detected Install CP210x or CH340 USB driver for your ESP32 board
Sensor found but bad data Try pulling SDA/SCL lines up with 4.7kΩ resistors to 3.3V

Project Structure

esp32-adxl345/
│
├── adxl345_esp32.ino   # Main Arduino sketch
└── README.md           # This file

Libraries Used

Project Ideas

  • Gesture-controlled robot or car
  • Motion-based game controller
  • Shock/vibration logger for fragile packages
  • Workout rep counter
  • Tilt-based servo motor control

License

This project is open source and available under the MIT License.

Contributing

Pull requests are welcome! Feel free to open an issue for bugs or feature requests.

uses

it can be used in gimble project

game gyro controller for pc

bike accleration meter or lean angle recorder. ETC

it can be used in other things to know the state the object in

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