Let's do the same thing in CircuitPython.

Here's the code:

# SPDX-FileCopyrightText: 2022 Carter Nelson for Adafruit Industries
#
# SPDX-License-Identifier: MIT

import time
import board
from adafruit_bme280 import basic as adafruit_bme280

# Get the board's default I2C port
i2c = board.I2C()

#--------------------------------------------------------------------
# NOTE!!! This is the "special" part of the code
#
# Create each sensor instance
# If left out, the default address is used.
# But also OK to be explicit and specify address.
bme1 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x77)  # address = 0x77
bme2 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x76)  # address = 0x76
#--------------------------------------------------------------------

print("Two BME280 Example")

while True:
    # Access each sensor via its instance
    pressure1 = bme1.pressure
    pressure2 = bme2.pressure

    print("-"*20)
    print("BME280 #1 Pressure =", pressure1)
    print("BME280 #2 Pressure =", pressure2)

    time.sleep(1)

With that code running on the CircuitPython board, the output will look like this:

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Two BME280 Example
--------------------
BME280 #1 Pressure = 1013.98
BME280 #2 Pressure = 1013.16
--------------------
BME280 #1 Pressure = 1013.98
BME280 #2 Pressure = 1013.13
--------------------
BME280 #1 Pressure = 1014.0
BME280 #2 Pressure = 1013.16
--------------------
BME280 #1 Pressure = 1014.01
BME280 #2 Pressure = 1013.2

These are the two important lines:

bme1 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x77)  # address = 0x77
bme2 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x76)  # address = 0x76

They create a separate sensor instance for each BME280 and specify the I2C address for each. We intentionally specify the default 0x77 address just to be explicit.

After that, each can be used to read the sensor values:

pressure1 = bme1.pressure
pressure2 = bme2.pressure

So things are pretty easy if alternate addresses can be used.

This guide was first published on May 04, 2022. It was last updated on May 04, 2022.

This page (CircuitPython) was last updated on May 04, 2022.

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