Wemos Based Solar Powered ESP8266 to geather environmental data
Within the Arduino Code the sensor data are published to MQTT
on the server, the python script subscribes to MQTT and feeds the data to a mariadb table.
Data is read from mariadb and visualized with matplotlib
example: 
This project was inspired by the Solar Powered WiFi Weather Station on Instructables: http://www.instructables.com/id/Solar-Powered-WiFi-Weather-Station