D.I.Y NORMAL CLOSE SAFETY LOCK
The idea of this small project is to make a normally closed - electromagnetic safety lock that can be controlled by mobile phone through WIFI/4G network. Even if without a power source, the safety lock will still remain in locked state due to force from 3 contact blocks at back side of lock.Please s...
By: tuenhidiy
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By: tuenhidiy
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[original story: Instructables]