ADXL345 Example

This example demonstrates how to use the espp::Adxl345 class to read acceleration data from an ADXL345 3-axis accelerometer over I2C using the ESP-IDF framework and ESPP.

esp-cpp/uart-serial-plotter output:

Table of Contents

• ADXL345 Example

  • Hardware Setup

  • Example Description

  • Configuration

  • Building and Flashing

  • Customization

  • Output

Hardware Setup

Connect the ADXL345 to your ESP32 (or S3, etc.) via I2C. Optionally, connect INT1 to a GPIO for interrupt handling.

Example Description

This example initializes the ADXL345, configures it for ±2g range and 100Hz data rate, and continuously reads acceleration data (X, Y, Z axes) in a background task. The data is printed in CSV format for easy plotting or analysis.

Configuration

You can configure the I2C pins and other options in sdkconfig.defaults or via menuconfig:

• CONFIG_EXAMPLE_I2C_SDA_GPIO (default: 21)

• CONFIG_EXAMPLE_I2C_SCL_GPIO (default: 22)

• CONFIG_EXAMPLE_ALERT_GPIO (default: 2)

Building and Flashing

idf.py set-target esp32s3
idf.py menuconfig   # (optional) configure pins
idf.py build
idf.py -p /dev/ttyUSB0 flash monitor

Customization

• To change the measurement range or data rate, modify the range and data_rate fields in the espp::Adxl345::Config struct in adxl345_example.cpp.

• For interrupt handling, connect INT1 to a GPIO

Output

The example prints acceleration data in the following CSV format:

%time (s), x (g), y (g), z (g)
0.000, 0.0012, -0.0008, 1.0003
0.010, 0.0011, -0.0007, 1.0002
...

Terminal output: esp-cpp/uart-serial-plotter output: