6656214af2
The board name for the nRF52 DK, so far known as nrf52_pca10040, is renamed to nrf52dk_nrf52832. Its documentation and all references to its name in the tree are updated accordingly. Overlay and configuration files specific to this board are also renamed, to match the new board name. Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
105 lines
3.3 KiB
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105 lines
3.3 KiB
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.. _adxl372:
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ADXL372: Three Axis High-g I2C/SPI Accelerometer
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################################################
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Description
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***********
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This sample application produces slightly different outputs based on the chosen
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driver configuration mode:
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* In **Measuring Mode with trigger support**,
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the acceleration on all three axis is printed in m/s^2 at the sampling rate (ODR).
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* In **Polled Measuring Mode**, the instantaneous acceleration is polled every 2 seconds.
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* In **Max Peak Detect Mode**, the device returns only the over-threshold
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peak acceleration between two consecutive sample fetches or trigger events.
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(In most high-g applications, a single 3-axis acceleration sample at the peak
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of an impact event contains sufficient information about the event, and the
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full acceleration history is not required.) Instead of printing the acceleration
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on all three axis, the sample application calculates the vector magnitude
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(root sum squared) and displays the result in g's rather than in m/s^2,
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together with an bar graph.
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References
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**********
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- ADXL372: http://www.analog.com/adxl372
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Wiring
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*******
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This sample uses the ADXL372 sensor controlled either using the I2C or SPI interface.
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Connect supply **VDD**, **VS** and **GND**. The supply voltage can be in
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the 1.6V to 3.5V range.
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I2C mode
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========
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Connect Interface: **SDA**, **SCL** and optionally connect the **INT1** to a
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interrupt capable GPIO. It is a requirement that **SCLK** must be connected to
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**GND** in I2C mode. Depending on the baseboard used, the **SDA** and **SCL**
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lines require Pull-Up resistors. With the **MISO** pin low, the I2C address for
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the device is 0x1D, and an alternate I2C address of 0x53 can be chosen by
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pulling the **MISO** pin high.
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I2C Address:
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* **0x1D**: if MISO is pulled low
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* **0x53**: if MISO is pulled high
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.. Note::
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When sharing an SDA bus, the ADXL372 Silicon Revision < 3 may prevent
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communication with other devices on that bus.
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SPI mode
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========
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Connect Interface: **SCLK**, **MISO**, **MOSI** and **/CS** and optionally
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connect the **INT1** to a interrupt capable GPIO.
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Building and Running
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********************
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This project outputs sensor data to the console. It requires an ADXL372
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sensor. It should work with any platform featuring a I2C/SPI peripheral interface.
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It does not work on QEMU.
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In this example below the :ref:`nrf52dk_nrf52832` board is used.
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.. zephyr-app-commands::
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:zephyr-app: samples/sensor/adxl372
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:board: nrf52dk_nrf52832
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:goals: build flash
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Sample Output: Max Peak Detect Mode
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===================================
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.. code-block:: console
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Waiting for a threshold event
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23.94 g: ########################
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Waiting for a threshold event
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38.01 g: #######################################
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Waiting for a threshold event
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51.40 g: ####################################################
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Waiting for a threshold event
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63.63 g: ################################################################
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Sample Output: Measurement Mode
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===============================
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.. code-block:: console
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AX= 2.94 AY= -5.88 AZ= 0.98 (m/s^2)
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AX= -4.90 AY= 6.86 AZ= -1.96 (m/s^2)
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AX= 2.94 AY= -2.94 AZ= 8.83 (m/s^2)
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AX= -0.98 AY= -6.86 AZ= -0.98 (m/s^2)
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AX= 6.86 AY= 2.94 AZ= 3.92 (m/s^2)
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AX= -0.98 AY= 4.90 AZ= -3.92 (m/s^2)
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<repeats endlessly>
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