Operating principle – radar, emits and receives a reflected response.
Advantages:
– More precisely detects the presence of a person in the room. This would be good in the bathroom, when someone is taking a bath, the radar will see it despite the infrared motion sensor (IR)
Disadvantages:
– Wired connection
– The radar detects any movement. When the bathroom hood is on, the radar will erroneously detect a person. A workaround is to use radar in tandem with an IR sensor. The IR sensor will be used when the hood is on
– The radar “sees” through walls. If you install it too close to the ceiling, the radar will “see” people walking on the floor above
– Trust of people. The radar emits radio waves at a frequency of 5.8 GHz. The documentation says that the radiation power is equal to or less than the power of ZigBee, but ZigBee consumes so little power that a small CR2032 battery can power the ZigBee radio module for more than 1 year. Why is an external 5W (5V 1A) power adapter used ?
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