ADXL34x Accelerometer

Measure linear acceleration along axes of ADXL34x family of accelerometers

Since R2022a

Add-On Required: This feature requires the Simulink Support Package for Arduino Hardware add-on.

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Libraries:
Simulink Support Package for Arduino Hardware / Sensors

Description

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

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.

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 n-by-3 array, where n is the value specified as Samples per frame.

Data Types: double

Timestamp — Timestamp at which data is read

matrix | (n)-by-1

Timestamp (in seconds) at which data is read from the sensor, returned as n-by-1 matrix, where n is the value specified as Samples per frame.

Dependencies

This output port appears only if you select the Enable timestamp output parameter.

The data type of Timestamp output depends on the value that you selected for the Data type parameter.

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 — I2C communication module

0 (default) | scalar

Specify the I2C module on the Arduino^® hardware to communicate with sensor peripherals. For more information on the Arduino pin mapping and modules that hardware boards support, see Pin Mapping for Arduino Timer-Independent Blocks.

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

Enable timestamp output — Set output port for obtaining timestamp

off (default) | on

Select this parameter to set Timestamp as one of the output ports.

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 Arduino hardware is single. Use this parameter to change the values to double, if required.

Samples per frame — Number of samples that the block outputs

1 (default) | positive integer

Specify the number of samples that the block outputs. The value that you specify here is also used to compute the output sample time:

Output sample time = Samples per frame * Sample time

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. The output sample time is the product of Samples per frame and Sample time that you specify.

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 — Enable interrupt when data is ready

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 generate 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.

Version History

Introduced in R2022a