import board
i2c = board.I2C() # or busio.I2C(pin_scl,pin_sda)
while not i2c.try_lock():  pass
print("I2C addresses found:", [hex(device_address)
    for device_address in i2c.scan()])

Speed up the I2C bus

CircuitPython defaults to 100 kHz I2C bus speed. This will work for all devices, but some devices can go faster. Common faster speeds are 200 kHz and 400 kHz.

import board
import busio
# instead of doing
# i2c = board.I2C()
i2c = busio.I2C( board.SCL, board.SDA, frequency=200_000)
# then do something with 'i2c' object as before, like:
oled = adafruit_ssd1306.SSD1306_I2C(width=128, height=32, i2c=i2c)

This guide was first published on Apr 02, 2022. It was last updated on May 15, 2024.

This page (I2C) was last updated on Mar 08, 2024.

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