OPTION 1

CODE

from adafruit_bus_device.i2c_device import I2CDevice

DEVICE_DEFAULT_I2C_ADDR = 0x42

class Some_Device():
    def __init__(self, i2c, address=DEVICE_DEFAULT_I2C_ADDR):
            self._device = I2CDevice(i2c, address)

USAGE

import board
import busio
import adafruit_some_device
i2c = busio.I2C(board.SCL, board.SDA)
sensor = adafruit_some_device.Some_Device(i2c)

EXAMPLE
https://github.com/adafruit/Adafruit_CircuitPython_AMG88xx/

OPTION 2

CODE

from adafruit_bus_device.i2c_device import I2CDevice

DEVICE_DEFAULT_I2C_ADDR = 0x42

class Some_Device():
    def __init__(self, i2c=None, address=DEVICE_DEFAULT_I2C_ADDR, **kwargs):
        if i2c is None:
            import board
            import busio
            i2c = busio.I2C(board.SCL, board.SDA)
        self.i2c_device = I2CDevice(i2c, address)

USAGE

import adafruit_some_device
sensor = adafruit_some_device.Some_Device()

EXAMPLE
None. But would work now if board.SCL and board.SDA exist.

OPTION 3

CODE

from adafruit_bus_device.i2c_device import I2CDevice

DEVICE_DEFAULT_I2C_ADDR = 0x42

class Some_Device():
    def __init__(self, i2c=None, address=DEVICE_DEFAULT_I2C_ADDR):
            self._device = I2CDevice(i2c, address)

USAGE

import adafruit_some_device
sensor = adafruit_some_device.Some_Device()

EXAMPLE
None. I2CDevice doesn't currently have a default behavior for a None input.

OPTION 4

CODE

from adafruit_bus_device.i2c_device import I2CDevice

DEVICE_DEFAULT_I2C_ADDR = 0x42

class Some_Device():
    def __init__(self, address=DEVICE_DEFAULT_I2C_ADDR, i2c=None, **kwargs):
        if i2c is None:
            import board
            import busio
            i2c = busio.I2C(board.SCL, board.SDA)
        self.i2c_device = I2CDevice(i2c, address)

USAGE

import adafruit_some_device
sensor = adafruit_some_device.Some_Device()

EXAMPLE
https://github.com/caternuson/CircuitPython_TSL2561/

OPTION 5

CODE

from adafruit_bus_device.i2c_device import I2CDevice

class Some_Device():
    def __init__(self, i2c):
        self.i2c_device = I2CDevice(i2c, 0x42)

USAGE

import board
import busio
import adafruit_some_device
i2c = busio.I2C(board.SCL, board.SDA)
sensor = adafruit_some_device.Some_Device(i2c)

EXAMPLE
https://github.com/adafruit/Adafruit_CircuitPython_DS3231/

Standardize I2C initialization for libraries that use it. #340

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