+ LCD/OLED can be used to measure body temperature or to detect movement... in Celsius and Fahrenheit!
Objectives: Heating, aeration, and irrigation. Behavior: Event when the temperature is low or high and the soil is dry. (Videos on Story)
Project showcase by Billy King
There are also microcontroller+sensors+battery holder "all-in-one" boards like this: http://s.click.aliexpress.com/e/cfT7D2eM but it's more expensive (and I have not test it yet). I hope that your project will succeed, good luck, best regards P. Lukas.
Cool project just a note: it would be better to use a capacitive soil moisture sensor instead of resistive in these projects because it is more resistant to electrolytic degradation that eventually destroy the sensor within a few weeks of operation. I play now with this cheap sensor for home purposes which gives quite good results even with long-term measurements: https://youtu.be/94G7iTvlkBM
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