1  # SPDX-FileCopyrightText: 2022 Carter Nelson for Adafruit Industries
 2  #
 3  # SPDX-License-Identifier: MIT
 4  
 5  import time
 6  import board
 7  import adafruit_tca9548a
 8  from adafruit_bme280 import basic as adafruit_bme280
 9  
10  # Create I2C bus as normal
11  i2c = board.I2C()
12  
13  #--------------------------------------------------------------------
14  # NOTE!!! This is the "special" part of the code
15  #
16  # For each TCA9548A, create a separate instance and give each
17  # the *same* I2C bus but with specific address for each
18  tca1 = adafruit_tca9548a.TCA9548A(i2c, 0x70)   # TCA with address 0x70
19  tca2 = adafruit_tca9548a.TCA9548A(i2c, 0x71)   # TCA with address 0x71
20  # Create each BME280 using the TCA9548A channel instead of the I2C object
21  # Be sure to use the TCA instance each BME280 is attached to
22  bme1 = adafruit_bme280.Adafruit_BME280_I2C(tca1[0])   # TCA 1 Channel 0
23  bme2 = adafruit_bme280.Adafruit_BME280_I2C(tca1[1])   # TCA 1 Channel 1
24  bme3 = adafruit_bme280.Adafruit_BME280_I2C(tca2[0])   # TCA 2 Channel 0
25  #--------------------------------------------------------------------
26  
27  print("Multiple BME280 / Multiple TCA9548A Example")
28  
29  while True:
30      # Access each sensor via its instance
31      pressure1 = bme1.pressure
32      pressure2 = bme2.pressure
33      pressure3 = bme3.pressure
34  
35      print("-"*20)
36      print("BME280 #1 Pressure =", pressure1)
37      print("BME280 #2 Pressure =", pressure2)
38      print("BME280 #3 Pressure =", pressure3)
39  
40      time.sleep(1)