What is Proximity Sensors? | A Complete Guide to Proximity Sensors
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Proximity Sensor
VCNL4010 Proximity/Light sensor : ID 466 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
What are capacitive proximity sensors?
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Inductive Proximity Sensor, How it Works & Application
A flexible proximity sensor formed by duplex screen/screen-offset printing and its application to non-contact detection of human breathing | Scientific Reports