Feather selection
FeatherS2 => StemmaQT connector for the sensor and Wifi to upload the measurement to Adafruit.io Feather nRF52840 => StemmaQT connector for the sensor and BLE to broadcast the values Feather STM32 => StemmaQT connector and SD card reader Feather M4 => no StemmaQT connector, no SD card, would require an FeatherWing AirLift to upload the measurement to Adafruit.io
FeatherWing
Adalogger FeatherWing => Has RTC and microSD card reader