If you plan on a vacation, here is a great project to track the temperature and soil moisture of your Plant using dweet.io and AWS IoT.
Project tutorial by CJA3D
A system using combination of an Aruino, several sensors and controlled via a ESP8266.
Project showcase by Nicolas Mora
Here is how to use the YL-39 + YL-69 soil humidity sensor with any Arduino.
Project tutorial by Sorin Trimbitas
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