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MicroPython LIS2HH12 I2C driver

MicroPython library for accessing the STMicroelectronics LIS2HH12 3-axis accelerometer over I2C. The LIS2HH12 is an ultra-low-power high-performance three-axis linear accelerometer belonging to the “pico” family. It has full scales of ±2g/±4g/±8g and is capable of measuring accelerations with output data rates from 10 Hz to 800 Hz.

Usage

Simple test with never ending loop.

import utime
from machine import I2C, Pin
from lis2hh12 import LIS2HH12

i2c = I2C(scl=Pin(26), sda=Pin(25))
sensor = LIS2HH12(i2c)

print("LIS2HH12 id: " + hex(sensor.whoami))

while True:
    print(sensor.acceleration)
    utime.sleep_ms(1000)

By default the library returns 3-tuple of X, Y, Z axis acceleration values in m/s^2 which is the SI standard. To get the acceleration values in g instead set the scale factor to SF_G in the constructor.

from machine import I2C, Pin
from lis2hh12 import LIS2HH12, SF_G

i2c = I2C(scl=Pin(26), sda=Pin(25))
sensor = LIS2HH12(i2c, sf=SF_G)

More realistic example usage with timer. If you get OSError: 26 or i2c driver install error after soft reboot do a hard reboot.

import micropython
from machine import I2C, Pin, Timer
from lis2hh12 import LIS2HH12

micropython.alloc_emergency_exception_buf(100)

i2c = I2C(scl=Pin(26), sda=Pin(25))
sensor = LIS2HH12(i2c)

def read_sensor(timer):
    print(sensor.acceleration)

print("LIS2HH12 id: " + hex(sensor.whoami))

timer_0 = Timer(0)
timer_0.init(period=1000, mode=Timer.PERIODIC, callback=read_sensor)

License

The MIT License (MIT). Please see License File for more information.