`bma` — bosch motion sensor library

The module contains the relevant control methods for bosch motion sensors.

class BMA423

The BMA423 class is used to control the BMA423 sensor. It is possible to obtain the acceleration value of the sensor, count the number of steps, etc.

The BMA423 class is currently available as a Technical Preview. During the preview period, feedback from users is encouraged. Based on this feedback, the BMA423 class API and implementation may be changed.

For example:

from machine import Pin, I2C
import bma

i2c = I2C(0, scl=Pin(22), sda=Pin(21),freq=400000)
b = bma.BMA423(i2c, address=25, int1=Pin(39))

# Configures to enable three-axis acceleration
b.accel_config(True, direction=b.LOWER_LEFT, layer=b.BOTTOM_LAYER)
b.accel()

# Enable step count
b.step_config(True)
# The number of read steps
b.step_counter()

# Active detection interrupt
def activity_cb(event):
    if event == 0:
        print('User is stationary')
    elif event == 1:
        print('User is walking')
    elif event == 2:
        print('User is running')
    elif event == 3:
        print('Invalid activity recognized')

b.activity(activity_cb)

# Click Event Break
def single_tap_cb(event):
    print('Single tap received')

b.single_tap(single_tap_cb)

# Double-click the event interrupt
def double_tap_cb(event):
    print('Double tap received')

b.double_tap(double_tap_cb)

# Suspension of the Arms Incident
def wrist_wear_cb(event):
    print('Wrist wear received')

b.wrist_wear(wrist_wear_cb)

Constructors

class bma.BMA423(i2c, address=24, int1=None, int2=None)

Construct and return a new BMA423 object with the following parameters:

i2c: machine.I2C objects

address: The i2c address of the bma423 sensor

int1: Pin object for receiving sensor interrupt 1

int2: Pin object for receiving sensor interrupt 2

Methods

BMA423.accel_configaccel_config(enable: bool, direction: int = LOWER_LEFT, layer: int = BOTTOM_LAYER)

Enable three-axis acceleration, and configure the position information of the sensor.

enable: Enable Disabled Gravity Accelerometer

direction: The marked position of pin#1 of the BMA423 sensor

layer: The location of the BMA423 sensor on the PCB

BMA423.accel(): Get the three-axis acceleration value.

BMA423.x(): Get the x-axis value.

BMA423.y(): Get the y-axis value.

BMA423.z(): Get the z-axis value.

BMA423.temperature(): Get the temperature value inside the sensor.

BMA423.reset(): Software resets the sensor and all register values return to their default values. But the step value is not cleared.

BMA423.clear(): Clear the step value.

BMA423.step_config(enable): Enable or disable step count.

BMA423.step_counter(): Read the number of steps.

BMA423.activity(handler, int_line=1)

Set interrupts for activity detection.

handler: Interrupt function for activity detection

int_line: BMA423 interrupt line

BMA423.single_tap(handler, int_line=1)

Set interrupt on click event.

handler: Interrupt function for activity detection

int_line: BMA423 interrupt line

BMA423.double_tap(handler, int_line=1)

Set interrupt on double click event.

handler: Interrupt function for activity detection

int_line: BMA423 interrupt line

BMA423.wrist_wear(handler, int_line=1)

Set the interrupt for the wrist raise event.

handler: Interrupt function for activity detection

int_line: BMA423 interrupt line

Constants

bma.BOTTOM_LAYER: The BMA423 sensor is located on the bottom layer of the PCB

bma.TOP_LAYER: The BMA423 sensor is on the top layer of the PCB

bma.UPPER_RIGHT: BMA423 sensor Pin#1 is in the upper right corner

bma.LOWER_LEFT: BMA423 sensor Pin#1 is in the lower left corner

bma.UPPER_LEFT: BMA423 sensor Pin#1 is located in the upper left corner

bma.LOWER_RIGHT: BMA423 sensor Pin#1 is located in the lower right corner

bma.INT1: BMA423 interrupt line 1

bma.INT2: BMA423 interrupt line 2

bma — bosch motion sensor library

class BMA423

Constructors

Methods

Constants

`bma` — bosch motion sensor library