How to build a one-time anti-theft alarm system
The purpose of this alarm is to sound the alarm only once. That is-when the alarm is activated-the sound siren will be in the preset length of time. Then it will close and stay closed. The alarm will not restart.
The basic alarm has an independently adjustable single entry and exit delay zone. This area will accommodate the usual types of normally open and normally closed input devices-such as pressure pads, reed contacts, micro switches, aluminum foil tape, and PIRs.
The extension module of the range allows you to add any instant alarm area, area and personal attack tamper zone to the system. There is also a non-timed output module. It will make an internal sounder, strobe light, light or siren after it goes to stop.
schematic diagram
The alarm can be hidden by a simple operation of the two-way switch-such as a light switch. If you want to know more about security-you can use a key switch-or a numeric code to operate the keyboard switch.
After setting the alarm-to ensure that the building is safe-that is, the green LED lighting are all-this yellow LED is off. If the yellow LED lighting-there is one in the wrong area-and the alarm will not be set.
When you move to the "Settings" position of SW1--Different settings regarding R9, you can leave the building for up to about a minute. When you return and open the door-the buzzer will sound. The settings for the Audi R8 are different-you still have about a minute and the alarm switch is turned off. If you do not do this-Siren will sound.
Depending on the settings of the R14-the audible alarm will take up to about 20 minutes. Then it will close-and stay closed. Of course-you can stop the noise of moving SW1 to the "off" position at any time.
When you return-if the buzzer is not sound, yellow LED lighting-then there is activated while you are away.
schematic diagram
Parts List
This article comes from the electronic enthusiast website (http: //), please indicate the source
1.2mm Wire To Board Connectors
ShenZhen Antenk Electronics Co,Ltd , https://www.antenkconn.com