/Projects/Phone call alert

After putting together this little device, you must enter programming-mode to learn some phone numbers which this module will call after detecting an input on it's sensor pin.

After programming just supply power to the device. After pressing the button "Pokreni dojavu alarma" it will start to dial (tone or pulse, depending on the jumper setup). When the phone call is succesfully established, the called party should press pound key "#" to stop the device from calling another number or again.

UPDATE: Source code is now available for download!


You should put a sensor instead of button "Pokreni dojavu alarma".

Programming the numbers

- press the "program" button
- pick up the phone that is connected to the same phone-line as this device
- punch-in first number and then "*" key
- punch-in then next number and then "*" key
- punch-in the rest of numbers, if more, and finalise with "*#" (example: 061123123*061456456*#)

Please note: The device will learn 64 characters/digits including * and # keys.


Author (sent by): Trax

Download counter: 16,881

Rating: (2.95, votes 3403)


Date: 17-02-2007

Lokalna verzija ove stranice: Phone call alert


Bookmark and Share Comments (67)

comment [37]

Thank you for these grat works, I have done this circuit and it works very good, but I tried to make it PCB but the connection was difficult, please if have another easy PCB layout of this circuit I'd be thankful, Sorry for that because I'm beginner in PCB. Waiting for you.

comment [36]

Open the PCB file *.lay with sPrint-Layout and print it from there.
IP: n/a

comment [35]

Sir, the circuit worked very good thank you, but I couldn't make it in PCB because of the color, if you can make it black-white I'll be thankful. waiting for your post.

comment [34]

Sir, the LED didn't blink while I was pressing the numbers, I think you are correct the problem from the transformer I have used because once I connected it the voltage across it is zero, ehen I remove it the voltage became high. the seller told me: "this is 1:1 trans"; but it's not 600:600 ohms I'll try to get the correct one. this is what should i take http://www.electrokit.com/en/transformer-600-600-ohm.43187

comment [33]

Does LED *BLINK* when you *PRESS* the DTMF tones on the phone? What does LED do when you produce DTMF tones on the phone?
IP: n/a

comment [32]

sorry it stopped flashing till I pressed PROGRAM button again .

comment [31]

it continues flashing till I press program button again. the transformer I have used is matching transformer with fixed I/O resistance values.

comment [30]

Does LED turn OFF when you press the DTMF tones on the phone? Also, what transformer did you use to connect the device to the telephone line?
IP: n/a

comment [29]

this is the video link on youtube http://youtu.be/jSU0f3PUPsI I've connected everything correctly. hope you will discover the mistake ISA.

comment [28]

Upload the video to Youtube and post the link here. I will take a look. You need to connect alarm to telephone line and also 1 telephone! How will you program the numbers into the alarm if you don't have another phone connected to the same line??
IP: n/a

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