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This motion detector alarm can detect a moving person from a distance of 1 meter. It uses a dual IR Transmitter-Receiver module HOA1405. When the sensor detects the reflected IR rays, alarm will sound ...
This contacts (or spare contacts) can also be used to activate a high-power warning alarm. Please note that, here T1 is wired as a mini electronic timer. Even after the PIR relay switched off, output ...