ADXL34x Accelerometer

Measure linear acceleration along axes of ADXL34x family of accelerometers

Since R2025a

Add-On Required: This feature requires the Embedded Coder Support Package for STMicroelectronics STM32 Processors add-on.

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Libraries:
Embedded Coder Support Package for STMicroelectronics STM32 Processors / Sensors / IMU Sensors

Description

The ADXL34x Accelerometer block reads data from the ADXL34x family of accelerometers (ADXL343, ADXL344, ADXL345, and ADXL346) with STM32 Processors.

You can use this block to measure linear acceleration along the X, Y and Z-axes. The block also provides the option to enable the data ready interrupt.

The block outputs acceleration as a 1-by-3 array.

Note

Always ensure to connect the sensor to the board, when performing monitor and tune with sensor block available in the model.

Ports

Output

Acceleration — Linear acceleration measured by ADXL34x sensor

vector

This port outputs the linear acceleration (in m/s²) along the x-, y- and z-axes as a 1-by-3 array.

Data Types: double

Note

It is observed that there are many faulty cloned ADXL345 sensors available in the market, with Z axis raw output becoming unresponsive. Buy the sensor from a genuine distributor to avoid this issue.

Parameters

I2C module — Module for communication

I2C1 (default)

The I2C module to be used for communication to the ADXL34x sensor. The number of I2C modules supported varies across different STM32 Processors. You can find the supported I2C modules corresponding to the processor (which you selected for the Hardware Board parameter in the Simulink^® model) by opening the Configuration Parameters dialog box and checking the I2C specific tabs under Target hardware resources.

I2C address — I2C address of ADXL34x sensor

0x53 (default) | 0x1D

The I2C address of the ADXL34x sensor from which the block reads the values.

The ADXL34x sensor can have two I2C addresses depending on the logic level on pin ALT of the sensor.

Pin Name	Pin State	I2C Address
ALT	Low	0x53
	High	0x1D

Data type — Output data type for values from ADXL34x sensor

single (default) | double

Select the data type of the sensor from which the block reads the values.

Specify the output data type for the values read from ADXL34x sensor. The default data type for STM32 Processors is single. Use this parameter to change the values to double, if required.

Sample time — Time interval to read data

-1 (default) | positive integer

Specify how often this block reads the data from the ADXL34x sensor. When you set this parameter to -1, Simulink determines the best sample time for the block based on the block context within the model.

Advanced settings

Accelerometer range — Full scale for measuring linear acceleration

±4g (default) | ±2g | ±8g | ±16g

Select the range of acceleration that the accelerometer can measure.

Accelerometer output data rate — Rate at which accelerometer data is sampled

12.5 Hz (default) | 0.1 Hz | 0.2 Hz | 0.39 Hz | 0.78 Hz | 1.56 Hz | 3.13 Hz | 6.25 Hz | 25 Hz | 50 Hz | 100 Hz | 200 Hz | 400 Hz | 800 Hz | 1600 Hz

Select the output data rate at which accelerometer data is sampled.

Enable data ready interrupt — Pin to generate data ready interrupt

off (default) | on

If this option is selected, an interrupt is generated on pin INT1 or INT2 of the sensor when data is ready, allowing you to trigger other subsystems to perform any action.

Interrupt generate pin — Pin to receive data ready interrupt

INT1 (default) | INT2

Select the interrupt generate pin to read accelerometer data.

Dependencies

To enable this parameter, select the Enable data ready interrupt parameter.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2025a