Domestic Seismic Alarm (2)

Published:2011/6/27 2:51:00 Author:Sue | Keyword: Domestic, Seismic, Alarm | From:SeekIC

When to use the alarm, put it on the wall or on the window frame, and the distance between C and the little magnet should be within 3mm. When there is an earthquake, the magnet will be pushed. When the push force reaches a certain level, the magnet will move vertically which will make IC's pin 2 output high level. VT is connected and HA will make an alarm sound like DU DU . VL is illuminated.



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