I test the concept and build a few projects to prove the concept. One project is a small OLED Clock which is synchronized with a NTP server. Another project is a Temperature Meter. Both sketches can be downloaded from IOTappstory.com
Sketches: https://github.com/SensorsIot/Wemos-Shields
Wemos examples: https://github.com/wemos/D1_mini_Examples
IOTappstory.com: http://IOTappStory.com
Sources:
https://wemoscc.aliexpress.com/store/1331105
https://www.aliexpress.com/store/2138141/search?origin=y&SearchText=wemos
https://www.aliexpress.com/store/439978/search?origin=y&SearchText=wemos
If you want to support the channel and buy from Banggood: https://bit.ly/2jAQEf4 (no additional charges for you)