[throwaway81523]

Thanks, I wasn't familiar with the Senseair S8. I had ordered the Adafruit one after checking Seeedstudio and finding that the ones there were almost as expensive. The Adafruit one is on a breakout board with a JST connector for their Stemma QT system (similar to Grove and Qwiic) so you can plug it into a cpu board without soldering.

I see on Aliexpress, there are a bunch of vendors selling the Senseair S8 for around $26, but other vendors are selling as low as $16 and some others over $35. I wonder whether the very low priced ones are fake or anything like that.

Oh well, the solderless connector will make experimentation easier. If I build more of these I'll get some of the Senseair modules.