Alarm triggering structure of anti-theft timed alarm device for intelligent home system

[0023] Example 1

[0024] An alarm trigger structure of a timed alarm anti-theft device for a smart home system, which includes an alarm circuit and an alarm trigger structure, the alarm trigger structure includes a trigger box 3, and the trigger box 3 is provided with a rectangular cavity 3-6, a rectangular cavity 3 -6 is provided with a switch seat 3-2, one end of the switch seat 3-2 is provided with an inclined plane 3-8, the other end is provided with a spring positioning rod 3-3, and the inclined plane 3-8 communicates with the key arranged in the cavity. Hole 2-7 cooperates, and the side wall of rectangular cavity 3-6 inner wall is also provided with the hole 3-4 that cooperates with spring positioning rod 3-3, and spring positioning rod 3-3 inserts in the hole, and spring positioning rod 3-3 A spring is installed on the inner wall of the rectangular cavity 3-6, and an electrode contact 3-2-2 is arranged on the inner wall of the rectangular cavity 3-6. .

[0025] Example 2

[0026] An alarm trigger structure of a timed alarm anti-theft device for a smart home system, which includes an alarm circuit and an alarm trigger structure, the alarm trigger structure includes a trigger box 3, and the trigger box 3 is provided with a rectangular cavity 3-6, a rectangular cavity 3 -6 is provided with a switch seat 3-2, one end of the switch seat 3-2 is provided with an inclined plane 3-8, the other end is provided with a spring positioning rod 3-3, and the inclined plane 3-8 communicates with the key arranged in the cavity. Hole 2-7 cooperates, and the side wall of rectangular cavity 3-6 inner wall is also provided with the hole 3-4 that cooperates with spring positioning rod 3-3, and spring positioning rod 3-3 inserts in the hole, and spring positioning rod 3-3 A spring is installed on the inner wall of the rectangular cavity 3-6, and an electrode contact 3-2-2 is arranged on the inner wall of the rectangular cavity 3-6. . The alarm trigger structure also includes a back cover 3-10, the back cover 3-10 is provided with a back cover key through hole 3-11 corresponding to the lock cylinder, and the back cover is also provided with a mounting hole 3-9.

[0027] Example 3

[0028] On the basis of embodiment 1-2, the alarm circuit includes a 555 timer alarm circuit, the power switch of the 555 timer alarm circuit is turned on or off through the alarm trigger structure, and the 555 timer alarm circuit is connected with a power self-locking circuit, when When the 555 timer alarm circuit reports to the police, the self-locking circuit connects the power supply for the 555 timer alarm circuit. This application is not limited to the 555 timing alarm circuit for alarming, and other alarm circuits such as based on single-chip microcomputers or DSP, CPLD processors can also be used. The main purpose of this application is to set a touch on the door lock, which combines the alarm circuit to achieve the purpose of anti-theft .

[0029] The 555 timer is a medium-scale integrated device that combines analog circuits and digital circuits. It has excellent performance and a wide range of applications. A small amount of resistance-capacitance components can be connected externally to form a monostable trigger and multivibrator. It can also form a Schmitt trigger without external components. It is often used as a timer and is widely used in instrumentation, household appliances, electronic measurement and automatic control. The interior of the 555 timer includes two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage. It provides two reference voltages VCC/3 and 2VCC/3. Therefore, the integrated 555 timing is widely used in the generation and transformation of pulse waveforms, measurement and control, etc.

[0030] To alarm, there must be a trigger signal, which can be triggered by the opening or closing of the switch. A 555 time base circuit can be used to form a monostable trigger. Use the No. 2 pin of the 555 chip as the input terminal of the trigger signal, and connect it into a monostable trigger. When the switch is closed, V11<2/3Vcc, V12<1/3Vcc, the output is high level, after the NAND The multivibrator circuit behind the gate stops working; when the switch is turned off, through the RC charging path, V11>2/3Vcc, V12>1/3Vcc, the output is low, and the multivibrator circuit behind the NAND gate works. The delay time depends on the size of the external resistance and capacitance, that is, the R and C of the charging path. The signal is transmitted to the speaker through the power amplifier composed of LM386 to make the speaker sound.