I had made some errors, and am pretty new to this, so I needed to reinstall raspbian and start from scratch. I NOW know that you can backup mycodo settings, but I didn’t have any saved. Everything is physically connected the same, but I can’t get my MHZ19B CO2 sensor to function. Anyone have any advice on where to start for troubleshooting?
I got it to work. Some combination of turning the serial options on and off in the pi settings, adding the sensor to mycodo again, and restarts of both the pi and of mycodo, and I got it to function again.