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>>> from machine import I2C, Pin
>>> bus = I2C(scl=Pin(21), sda=Pin(22))
>>> bus.scan()
[8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 5]
Those are my device's details:
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>>> import os
>>> os.uname()
(sysname='esp32', nodename='esp32', release='1.13.0', version='v1.13 on 2020-09-02', machine='ESP32 module with ESP32')