Steve_M
TVWBB Guru
This thing looks like it checks a lot of boxes for the heatermeter.
OpenWRT
ATmega32U4
Wi-Fi 802.11 b/g/n
Micro SD slot
https://www.seeedstudio.com/LinkIt-Smart-7688-Duo-p-2574.html
OpenWRT
ATmega32U4
Wi-Fi 802.11 b/g/n
Micro SD slot
https://www.seeedstudio.com/LinkIt-Smart-7688-Duo-p-2574.html
LinkIt Smart 7688 Duo is an open development board compatible with Arduino Yún sketches, based on the OpenWrt Linux distribution, MT7688 and ATmega32u4.