Reminding device for preventing key from being forgotten to be pulled
A reminder device and forget-to-unplug technology, applied to instruments, alarms, etc., can solve family safety hazards and other problems, and achieve the effects of low price, high sensitivity, and easy installation
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[0016] The content of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0017] Such as figure 1 and figure 2 Shown is a reminder device for preventing forgetting to pull out the key provided by the present invention, which is characterized in that it includes a magnetic device 2 arranged on the key 1 and a delay alarm circuit arranged on the lock; the delay alarm circuit includes Power supply, magnetic control trigger switch K1-3, single-chip microcomputer U1-4, triode N1-5 and alarm sounder L1-6, the magnetic control trigger switch K1-3 is connected to the positive pole of the power supply and the trigger signal input of the single-chip microcomputer U1-4 Between the terminals, the power signal input terminal of the single-chip microcomputer U1-4 is connected to the positive pole of the power supply, the alarm signal output terminal of the single-chip microcomputer U1-4 is connected to the base ...
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