comment [33]
- From trax on 16-03-2012 at 08:09:30
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
/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: 12,343
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Date: 17-02-2007
Lokalna verzija ove stranice: Phone call alert
Tags: controller, dtmf, line, phone. +add your tag
505_phone_dojava.zip
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comment [34]
- From adelyz on 16-03-2012 at 14:24:31
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
IP: 109.200.182.3
comment [32]
- From adelyz on 15-03-2012 at 16:48:03
sorry it stopped flashing till I pressed PROGRAM button again .
IP: 89.189.87.98
comment [31]
- From adelyz on 15-03-2012 at 16:46:20
it continues flashing till I press program button again. the transformer I have used is
matching transformer with fixed I/O resistance values.
IP: 89.189.87.98
comment [30]
- From trax on 15-03-2012 at 14:38:07
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]
- From adelyz on 15-03-2012 at 14:32:13
this is the video link on youtube http://youtu.be/jSU0f3PUPsI
I've connected everything correctly.
hope you will discover the mistake ISA.
IP: 46.35.88.212
comment [28]
- From trax on 14-03-2012 at 14:59:58
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
comment [27]
- From adelyz on 14-03-2012 at 14:17:42
I have record the exp. with video I will upload it, Would you mind watching the video ?
I have connected the two line of the circuit to the line of the telephone , not the telephone
it self. Is it correct ?
please replay, thanks
IP: 109.74.37.69
comment [26]
- From trax on 14-03-2012 at 13:29:05
When you press numbers on the other phone, the LED should register it turning OFF (or ON, I can
not remember). does that happen? if not, then Audio signal is not being passed to MT8880 IC
through the transformer. OR the crystal you used on MT8880 is not operating properly!
IP: n/a
comment [25]
- From adelyz on 14-03-2012 at 09:39:30
I've connected the ckt to the telephone line once I turn it on the LED started flashing, then I
pressed PROGRAM button the LED glowed I punch in the number then I pressed (* #); After that I
pressed the ALARM button, but nothing happened. I checked the connection it was correct, I
don't know what to do now can you tell me please??
IP: 46.35.85.64
