AZD080

IQ Switch® ProxSense® Series AZD080 – A guide to prolonged detection using capacitive proximity sensors Azoteq offers a unique combination of solutions that may be used for prolonged proximity detection. This guide is intended to aid in the selection and design process. The following guide will review types of proximity sensors for prolonged detection, followed by a focus on capacitive sensing design specifically for such occupancy-type solutions. Various algorithms will be evaluated in order to choose the most effective response for a specific application. 1 Contents: 1. Overview of popular sensing solutions 2. Discussion of capacitive proximity sensing sensitivity 3. Evaluation of prolonged detection algorithms 4. Conclusion, with a focus on selecting an Azoteq prolonged proximity detection solution 2 Brief overview of sensor types 2.1 Infrared sensing Infrared sensors are based on the reflection of infrared light and the absence thereof. Advantages: ● Directed sensing with narrow field of influence ● Robust against environmental drift effects Disadvantages: ● The inclusion of an aperture for light transmission and reception ● Relatively expensive hardware ● Relatively high power consumption ● Less effective against materials that absorb light 2.2 Accelerometer monitoring Accelerometers are multi-purpose sensors that may be used to detect human interaction. Generally, these have the ability to sense acceleration in three dimensions, as well as orientation in relation to t...