SST Liquid Level Sensor (from Sparkfun)

Technical description:

There are two types: point and continuous. Point level sensors can be used to determine if the liquid is above a point (returns a boolean type output). Continuous sensors can be used to monitor a body of liquid, returning a range of values.

A liquid level sensor is used to determine the level of a fluid. This information could be used to calculate the volume of liquid in a rectangular container, since the sensor gives a height.

Limitations:

Continuous level sensors can be more expensive than point level sensors. The sensor should be isolated from the rest of the circuit to prevent water damage.

Skill: Advanced

Sample Sensor: SST Liquid Level Sensor

Sample Exercise: Smart Measuring Cup