Thanks for you input, Neil. We decided to try out the Feather mainly for cost issues, and it seems fine for a lot of things, but it just isn’t working with the sensor we have. Seems to have problems communicating with the Serial port. I can read other I2C sensors, but this one is giving me fits.
We looked at the Mayfly and decided to try out the Feather b/c it was cheaper. However, I think we now know this may have been a mistake. We ordered the very last Mayfly on Amazon and we’re going to try that. Some initial tests suggest it will work. However, I would still like to try to get it working on the Feather.