IIS3DWB Module

This module contains the driver for STMicroelectronics IIS3DWB 3-axis digital vibration sensor with low noise over an ultra-wide and flat frequency range.

In the IIS3DWB, the sensing elements of the accelerometer are implemented on the same silicon die, thus guaranteeing superior stability and robustness. (datasheet).

class IIS3DWB(spidrv, pin_cs, clk=5000000)

Class which provides a simple interface to IIS3DWB features.

Creates an instance of IIS3DWB class, using the specified SPI settings and initial device configuration

Parameters:

• spidrv – the SPI driver to use (SPI0, ...)
• pin_cs – Chip select pin to access the IIS3DWB chip
• clk – Clock speed, default 500 kHz

Example:

from stm.iis3dwb import iis3dwb

...

vibro = iis3dwb.IIS3DWB(SPI0, D10)
acc = vibro.get_acc_data()

reset()

Reset the device using the internal register flag.

enable(odr=IIS3DWB_ODR_26k7Hz, fs=0)

Sets the device’s configuration registers for accelerometer.

Parameters:

• odr : sets the Output Data Rate of the device. Available values are:

  Value	Output Data Rate	Constant Name
  0x00	OFF	IIS3DWB_ODR_OFF
  0x05	26.7 KHz	IIS3DWB_ODR_26k7Hz

• fs : sets the Device Full Scale. Available values are:

  Value	Full Scale	Costant Name	in mg/LSB
  0x00	±2g	IIS3DWB_ACC_SENS_FS_2G	0.061 mg/LSB
  0x01	±4g	IIS3DWB_ACC_SENS_FS_4G	0.122 mg/LSB
  0x02	±8g	IIS3DWB_ACC_SENS_FS_8G	0.244 mg/LSB
  0x03	±16g	IIS3DWB_ACC_SENS_FS_16G	0.488 mg/LSB

Returns True if configuration is successful, False otherwise.

disable()

Disables the accelerator sensor.

Returns True if configuration is successful, False otherwise.

whoami()

Value of the IIS3DWB_WHO_AM_I register (0x6B).

get_acc_data(ms2=True, raw=False)

Retrieves accelerometer data in one call.

Parameters:

• ms2 – If ms2 flag is True, returns data converted in m/s^2; otherwise in mg (default True)
• raw – If raw flag is True, returns raw register values (default False)

Returns acc_x, acc_y, acc_z

get_temp()

Retrieves temperature in one call; if raw flag is enabled, returns raw register values.

Returns temp

get_fast()

Retrieves all data sensors in one call in fast way (c-code acquisition).

• Temperature in °C
• Acceleration in m/s^2

Returns temp, acc_x, acc_y, acc_z

set_event_interrupt(pin_int, enable)

Enables the interrupt pins. When data from sensor will be ready, the related interrupt pin configured will be set to high.

Parameters:

• pin_int – ID of the interrupt pin to be enabled/disabled. Available values are 1 o 2.
• enable – If enable flag is True, interrupt pin will be enabled, otherwise will be disabled.

Returns True if configuration is successful, False otherwise.