The basics of functioning
In this project, I'm going to present a simple implementation of a plant monitor with the following two special features:
The first feature is the ability to measure and estimate the soil moisture according to a direct measurement of the moisture via a dedicated sensor and through the temperature difference between the external soil temperature and the internal soil temperature in the garden pot where the plant lives. This is because the internal resistance of the moisture sensor may change with the temperature; in fact, when the sun beats down on the soil and the soil warms up, the resistance changes and this effect will produce a false dry read. For this reason, we employ two different temperature probes in order to know if the soil is too hot with respect to the internal soil temperature and then we regulate the moisture level.
The second feature is the ability to add a webcam to take several pictures of our lovely plant at well-defined intervals and the possibility...
