If you suddenly urgently needed to take the place of protection, but there is no alarm, then this is not a problem. The most simple GSM alarm system, and even with the motion detector, you can make it my old mobile phone. The scheme is very simple, even a novice electronics can cope with its assembly.
Need
- Motion Sensor - http://ali.pub/5J3FUR
- Transistor BC558;
- Resistor 300 Ohm, 1 com.
Scheme of the security system
Power supply 5 - 9 V. It is not necessary to use the crown, you can use the stationary charge for the same mobile phone.
The principle of work is very simple. Almost every button cell phone has a quick dial function (you can configure it in the phone menu). This is when one button is clamped and the number stored for this button is closed from its memory. So, in the settings, write your number to another phone. To this button, connect the contacts that will go to the circuit. As soon as the sensor is expanding the movement, it will give a signal to the transistor, which in turn closes the cell phone button and an outgoing call to your smartphone will occur. As a result, you will be notified of the movement on the protected object.
Also, see this version of the alarm without a motion sensor and without schemes - https://sdelaysam-svoimirukami.ru/5086-prostejshaja-gsm-signalizacija-iz-starogo-telefona.htmlHow to make a security system with a motion sensor from a push-button mobile phone
We disassemble the cell phone and with the help of a stationery knife, we cut the top contact of the button and flexing it.
Next, using the soldering iron we solder two thin wiring to the contacts of the button.
We collect a mobile phone, having previously done a slot for wires in the case. We collect a simple scheme.
Connect the power 9 V and check the work. As soon as a person or part of the sensor fall into the field of view, the security system will work.
And on your smartphone, the incoming call signal will be heard.
