Is it possible to consider a thing protected if it doesn’t have any protective equipment on it or if an ordinary lock weighs? Of course not. The most popular protection is an alarm, but its cost is quite high, and not every thing can be set to sound an alarm.
We offer to watch a video recording, which shows in detail how to use an old mobile phone to make an alarm that can be attached to any thing or device.
[media = https: //www.youtube.com/watch? v = 5-hZSd-WLrA]
To make an alarm, we need:
- old mobile phone;
- headset;
- Hens-free;
- a long wire;
- radio switch.
The essence of the device is that the phone will send a signal to another device. The call send keys can be soldered anywhere.
We will use hens-free. This will give us the opportunity to use not quite dead phones.
Take any headset from an old mobile phone and cut off the microphone from it.
Wrap the microphone with electrical tape and solder two wires to it. Soldering must be done in place of the key that you need to press when you call.
We take an ordinary radio switch, which you can buy in any stall for 10 rubles. You can attach this switch to a door or window frame. You can try to fix such an alarm on car. At the top of the switch there is a kind of button that is pressed when the door is closed. If the attacker broke into the apartment, the button returns to its original position and a signal to open the door is sent to the working mobile phone.
On the phone, you must enter a call to the key of the last set and connect a Hens-free wire to it, which will already be connected to the radio transmitter and headset with microphone.
The switch, to which we will solder the wiring, has three legs. The middle leg goes to the closure, and the two side legs to soak.
We must solder the wiring to the two extreme legs. When the upper lever button is pressed against the switch, the circuit opens and sends a call from a mobile phone.If the switch is a parrot, then we need to open the door 2 times.
You can also use a switch gear. Use a gyro with three outputs. The gyro must be bought KEM3 brands, but it is not always highly effective. It requires fine tuning.
It is important to use phones that can standby for up to one month.
This type of system can be used as a bug. By the means of the microphone, which is hidden, you can hear what is happening in our apartment. When the door opens and the radio button snaps open, the handset will automatically lift.