While camping, it is impossible to keep all personal items in the radius of a straightened hand. And leaving things outside the tent, it can be very difficult to sleep, since there is a possibility of theft. Especially for such cases, you can purchase the so-called autonomous alarm, or you can make it in home conditions.
Let's see how this makes the author useful. homemadeand then repeat the process step by step.
So we need:
- Chinese alarm unit with magnet;
- Terminal blocks.
First of all, open our alarm unit. To do this, take out the batteries, since there is a screw under them, which should be unscrewed.
As a rule, in most Chinese alarms there is a small cavity in which we will insert our terminal blocks. We take a drill and drill a small hole in the side corner of the body of the alarm unit.
When the hole is drilled, it needs to be expanded a little so that it includes a section of the part from the terminal block connector.
There are two such holes.
Now you are ready to install the terminal blocks. To do this, solder the reed switch or, more simply, a glass cone, which is soldered to the alarm unit board.
Next, instead of the reed switch, solder the extension wires to the board.
After that, we connect our wiring to the terminal blocks. This can be done simply by screwing on the nuts and tightening.
The next step is mandatory for the successful assembly and operation of an autonomous alarm. In order to avoid possible contact between the switch of the alarm unit with one of the terminal block nuts, which is unacceptable, since these two chains are radically different, we attach a piece of electrical tape to the nut.
Thus, our circuit is fully assembled, and all different circuits are isolated to avoid unwanted contacts. We can only close the alarm unit case.
You can try our alarm. To do this, take a thin piece of copper wire. We clear the insulation on it and fasten the wiring with a terminal block. The second end is screwed onto the second terminal block.The middle part of the wire is wound on an object that can be stolen at night. The alarm works extremely primitive. The thief should break the wire, as the alarm starts to beep at the top of his voice, warning of unwanted intrusion and theft.