MicroPython MMA8451 Library¶

mma8451¶

MicroPython module for the MMA8451 3 axis accelerometer

• Author(s): Jose D. Montoya

class micropython_mma8451.mma8451.MMA8451(i2c, address: int = 0x1D)[source]¶

Driver for the MMA8451 Sensor connected over I2C.

Parameters:¶

i2c : I2C¶

The I2C bus the MMA8451 is connected to.

address : int¶

The I2C device address. Defaults to 0x1D

Raises:¶

RuntimeError – if the sensor is not found

Quickstart: Importing and using the device

Here is an example of using the MMA8451 class. First you will need to import the libraries to use the sensor

from machine import Pin, I2C
from micropython_mma8451 import mma8451

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))
mma8451 = mma8451.MMA8451(i2c)

Now you have access to the attributes

accx, accy, accz = mma8451.acceleration

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

Acceleration measured by the sensor in \(m/s^2\).

property data_rate : str¶

Sensor data_rate

Mode	Value
mma8451.DATARATE_800HZ	0b000
mma8451.DATARATE_400HZ	0b001
mma8451.DATARATE_200HZ	0b010
mma8451.DATARATE_100HZ	0b011
mma8451.DATARATE_50HZ	0b100
mma8451.DATARATE_12_5HZ	0b101
mma8451.DATARATE_6_25HZ	0b110
mma8451.DATARATE_1_56HZ	0b111

property high_pass_filter : str¶

Sensor high_pass_filter

Mode	Value
mma8451.HPF_DISABLED	0b0
mma8451.HPF_ENABLED	0b1

property high_pass_filter_cutoff : str¶

Sensor high_pass_filter_cutoff sets the high-pass filter cutoff frequency for removal of the offset and slower changing acceleration data. In order to filter the acceleration data high_pass_filter must be enabled.

Mode	Value
mma8451.CUTOFF_16HZ	0b00
mma8451.CUTOFF_8HZ	0b01
mma8451.CUTOFF_4HZ	0b10
mma8451.CUTOFF_2HZ	0b11

property operation_mode : str¶

Sensor operation_mode

Mode	Value
mma8451.STANDBY_MODE	0b0
mma8451.ACTIVE_MODE	0b1

property scale_range : str¶

Sensor scale_range

Mode	Value
mma8451.RANGE_2G	0b00
mma8451.RANGE_4G	0b01
mma8451.RANGE_8G	0b10