Robin: I have been using the BME680 since it first came out, but only on the Teensy 3.2 and without using the BSEC libs. However since the shortages of IC's the only Teensy easily available is the Teensy 4.1. It has become the most popular of the series because of its availability, power, ethernet, second USB port and many other features which make it the King of the Microcontrollers at this present time. Many thousands of these Microcontroller boards have been sold in the last 2 years. I guess I will have to look elsewhere for the features that the BE680 provides. Regards, Ed
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