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Use capacitive sensing to Implement reliable liquid level sensing | Cypress Semiconductor

Use capacitive sensing to Implement reliable liquid level sensing

Last Updated: 
Aug 26, 2015

Capacitive sensing technology has become the primary technology underlying touch interfaces.  However, capacitive sensing is not limited to creating dynamic buttons and sliders on different appliances for the user interface. There are numerous applications where capacitive sensing can replace traditional ways of implementing specific functions like liquid level sensing, humidity sensing, and sensing of metallic objects. This article will discuss how to implement liquid level measurement using capacitive sensing technology.

Point level measurement

To begin, liquid level measurement can be implemented in one of two ways.  Using point level measurement, sensors placed at discrete levels within the tank are used for tank full detection, tank empty detection, and various fixed liquid levels.  Point level measurements are generally low resolution.  With continuous level measurement, the liquid level of the tank can be detected at finer levels for those applications, which need greater accuracy. Both these types of measurement require different implementation topologies. To illustrate how capacitive sensing can be used to monitor liquid levels, this article will concentrate on point level measurement implementations approaches and challenges.

Click on the links for more details of this article - Part I, Part II