This aquarium monitor is a good (even if very simple) example about how a web monitoring system should be implemented, giving to the reader some basic ideas about how a mid-complex system works and how we can interact with it in order to modify some system settings, displaying some alarms in case of malfunctioning, and plotting a data logging on a PC, smartphone, or tablet.
Despite these aspects, the basic functioning of this project is similar to what we've already done in previous chapters: we have a periodic task that collects the data and then decides what to do. However, this time, we have a user interface (the web panel) to manage, and a video streaming to be redirected into a web page.
Note also that in this project, we need an additional power supply in order to power and manage 12V devices (such as a water pump, a lamp, and a cooler) with the BeagleBone Black, which is powered at 5V instead.