Mobile Phone Alarm

Electronics / Signaling

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If someone has an old mobile phone lying around, then you can make a simple alarm out of it, to protect the premises, auto etc.

It will send a signal to your mobile phone when any sensor of the system is triggered. It works simply - the sensor acts on the auto redial button and a call comes to you. The circuit is based on the PIC12F509 controller and the K561KT3 chip.

The microcontroller controls the DD1 IC keys that control the power button of the phone and the call button. The SB1 button turns on the indicator, green indicates normal operation, red indicates system operation. To reset the settings, press SB2.

Construction and details:
1. PIC12F509
2. K561KT3
3. R1 1.8k
4. R2 10k
5. C1 0.1mk
6. Cr. Light-emitting diode
7. Green Light-emitting diode

The alarm is powered by three AA batteries, or one flat R12.
Board with elements installed on it

Before connecting the phone to the signaling, you need to put a dialer on your number on button 1. Turn off the sound greeting. We open the phone and solder to the buttons on. I1 wires 20 cm long. 3 from the button on And 2 from 1. We check the operation by closing the wires after resetting the SB2 button. Then we solder the wires and check the operation of the device.

And most importantly, charge the cell phone’s battery in time.

Microcontroller programming file and ohh.asm program:

b006.rar [1.12 Kb] (downloads: 195)

Borate April 30, 2019 10:41 +1

Reply To quote A complaint

The author’s most unreliable place is soldering wires to the phone’s buttons, these places are quite difficult to find.
It is made much easier without firmware and additional electronic boards. We take a phone for the elderly with the "sos" button on the back side, 2 wires are soldered to it that connect to the standard signaling to make contacts that close when the alarm is triggered (see the diagram of your alarm) or to a separate switch that is triggered by opening the driver's door . These are all functions that the author described.
In addition, I made an additional blocking of the ignition of the car through the phone.We disassemble the phone, find the vibration signal motor in it, pull it out, and not solder the wires 2 wires that connect to the solid-state relay, that is, if you received a call (that the alarm went off), you listen to what is happening in your car through the phone, making sure you need to block Ignition system make a call back and a solid-state relay blocks the ignition system with your contacts.

April 27, 2018 8:17 p.m. +1

solder to the buttons on. I1 wires 20 cm long. 3 from the button on And 2 from 1.

Yes, you can’t figure it out without a bottle. ((

And most importantly, charge the cell phone’s battery in time.

The device is stationary, even if there is no 230 V network (for example, in the country), you can power everything, including the phone, from the battery.

Mobile Phone Alarm

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