I have 4 of the BME280 devices,
There are only 2 possible I2C addresses from the chips.
I was thinking of putting 4 on one multiplexor
Since I only need to read one at a time, and then only once a minute, speed is not important.
Any suggestions ?
Use the trick of wiring up the address lines to Arduino output lines. One line on each chip. Then you can send one output high and talk to that one chip with the other three chips at the same address that you are not using. When finished put the chip address line low and out the next chip's address line high and talk to the same address but you will be talking to a different chip.