Add LSM6DS3 subclass

[myllyja]

This adds the LSM6DS3 class which is a copy of the LSM6DS33 class with a different chip ID. This makes the library work on the Seeed XIAO nRF52840 Sense board. More info on the IMU can be found in the Seeed Wiki

Tested with "Adafruit CircuitPython 7.2.0-alpha.2 on 2022-02-11; Seeed XIAO nRF52840 Sense with nRF52840"

import board
import busio
import digitalio

from adafruit_lsm6ds.lsm6ds3 import LSM6DS3

# Enable power to the IMU
imupwr = digitalio.DigitalInOut(board.IMU_PWR)
imupwr.direction = digitalio.Direction.OUTPUT
imupwr.value = True

# Create an I2C bus with the IMU pins
imu_i2c = busio.I2C(board.IMU_SCL, board.IMU_SDA)
sensor = LSM6DS3(imu_i2c)

Now the sensor values can be read like the example shows:

>>> acc_x, acc_y, acc_z = sensor.acceleration
>>> gyro_x, gyro_y, gyro_z = sensor.gyro

>>> print(f"accX: {acc_x} accY: {acc_y} accZ: {acc_z}")
accX: -0.165105 accY: -0.0885344 accZ: 10.0822
>>> print(f"gyroX: {gyro_x} gyroY: {gyro_y} gyroZ: {gyro_z}")
gyroX: 0.0129809 gyroY: -0.0316123 gyroZ: -0.00458149

[ladyada]

thanks :)