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Person In Bed Sensor (PIBS)
The aim of the person in bed sensor is to detect if elderly or disabled people are in the bed. A inductive proximity sensor detects the movement of the springs. The strength of the springs can be selected to get two different behaviors:
With strong springs and an analog proximity sensor, a signal proportional to the weight (and position) of the person in the bed can be detected.
With weak springs and a digital proximity sensor (or a micro switch), a digital signal telling if a person is in bed or not is produced.
See the manuals
Pibs for helascol in action at supsi