User needs¶

This document needs lists on the heighest level what the system is intended to fulfill.

The system must be able to monitor the level of a water barrel, filled with rain waiter.

The level must be able to be viewed remotely. (I.e. without physical access to the system)

The system shall be able to run for at least 1 year without the need to perform any maintenance, such as changing batteries, cleaning, etc.