It’s a small DIY project from ADF Devices. It takes about one evening to complete.
At the end you will have sensor connected to WiFi network with measurements visible on ADF Devices website and in SmartThings app. 
To add temperature sensor to SmartThings:
- Follow instructions to build and connect device (or add example sensor to try it)
- In SmartThings app select ‘+’ to add device, sort by brand and select ADF Devices.
Thank You for reading. Let us know if you trying it out, have any questions or suggestions.