MicroPython BMA400 Library¶

bma400¶

MicroPython Driver for the Bosch BMA400 Accelerometer

• Author(s): Jose D. Montoya

class micropython_bma400.bma400.BMA400(i2c, address: int = 0x14)[source]¶

Driver for the BMA400 Sensor connected over I2C.

Parameters:¶

i2c : I2C¶

The I2C bus the BMA400 is connected to.

address : int¶

The I2C device address. Defaults to 0x14

Raises:¶

RuntimeError – if the sensor is not found

Quickstart: Importing and using the device

Here is an example of using the BMA400 class. First you will need to import the libraries to use the sensor

from machine import Pin, I2C
from micropython_bma400 import bma400

Once this is done you can define your machine.I2C object and define your sensor object

i2c = I2C(1, sda=Pin(2), scl=Pin(3))
bma400 = bma400.BMA400(i2c)

Now you have access to the attributes

accx, accy, accz = bma.acceleration

property acc_range : str¶

Sensor acc_range

Mode	Value
bma400.ACC_RANGE_2	0x00
bma400.ACC_RANGE_4	0x01
bma400.ACC_RANGE_8	0x02
bma400.ACC_RANGE_16	0x03

property acceleration : tuple[int, int, int]¶

Acceleration in \(m/s^2\) :return: acceleration

property filter_bandwidth : str¶

Sensor filter_bandwidth Data rate between 800Hz and 12.5Hz, controlled by output_data_rate. Its bandwidth can be configured additionally by filter_bandwidth:

Mode	Value
bma400.ACC_FILT_BW0	0x00 0.48 x ODR
bma400.ACC_FILT_BW1	0x01 0.24 x ODR

property output_data_rate : str¶

Sensor output_data_rate

Mode	Value
bma400.ACCEL_12_5HZ	0x05
bma400.ACCEL_25HZ	0x06
bma400.ACCEL_50HZ	0x07
bma400.ACCEL_100HZ	0x08
bma400.ACCEL_200HZ	0x09
bma400.ACCEL_400HZ	0xA4
bma400.ACCEL_800HZ	0xB8

property oversampling_rate : str¶

Sensor oversampling_rate oversampling rate 0/1/2/3 for normal mode osr=0: lowest power, lowest oversampling rate, lowest accuracy osr=3: highest accuracy, highest oversampling rate, highest power settings 0, 1, 2 and 3 allow linearly trading power versus accuracy(noise)

Mode	Value
bma400.OVERSAMPLING_0	0x00
bma400.OVERSAMPLING_1	0x01
bma400.OVERSAMPLING_2	0x02
bma400.OVERSAMPLING_3	0x03

property power_mode : str¶

Sensor power_mode

In sleep mode, data conversions are stopped as well as sensortime functionality.

In low power mode, data conversion runs with a fixed rate of 25Hz. The low power mode should be mainly used in combination with activity detection as self wake-up mode.

In normal mode, output data rates between 800Hz and 12.5Hz.

Mode	Value
bma400.SLEEP_MODE	0x00
bma400.LOW_POWER_MODE	0x01
bma400.NORMAL_MODE	0x02
bma400.SWITCH_TO_SLEEP	0x03

property source_data_registers : str¶

Sensor source_data_registers

Mode	Value
bma400.ACC_FILT1	0x00
bma400.ACC_FILT2	0x01
bma400.ACC_FILT_LP	0x02

property temperature : float¶

The temperature sensor is calibrated with a precision of +/-5°C. :return: Temperature