At xmas I got my father's old NTM Talkman phone. I looking people who are ready to help me and same time convert his/her own old phone to working in gsm network.
I had long time idea to convert fixed phone to gsm phone. So I bought Arduino GPRS shield. I study it and find it easy to use with AT-commands. Then I studied arduino keypad library (matrix keyboard) and made my fixed line phone keyboard to working. After this I hit to problem. Mainly personal and because eight years in Nokia service is all what is needed to get pension (in my case), I have problem to concentrate to things where I need to connect things together in my mind.
I still want to make Talkman working with GSM network. Now I ask help from you. I'm making open source project to convert old fixed or mobile phone to gsm phone.
There is few things what need to clarify before we continue.
- Power
- Lithium
- old fashion 12v battery
- 5v power supply
All these need to keep in mind. I belive that at beginning of project we use only 5v power supply. Later I need to choose between 12v accu or lithium batteries.
- two arduino system or one?
- One arduino manage keyboard, leds and LCD screen and other manage gsm-services and power.
- One arduino (Mega?) manage everyhing
When I tested fixed phone conversion, I found that Uno have just needed count of IO ports for handle a keyboard, phone and leds. I used ws2811 leds, so only one port was needed to handle 3 leds. TalkMan have mush more features what need to make working, so UNO have too few IO ports.
Also I want to make this so that anyone who want convert any other phone can more easier to use it his/her own project. So user interface should be taken to own arduino.
If project build system by using Mega alone, it might be possible. Handle have 25 pin connector, so I need only clarify how many are wired. There isn't place for Mega in handle, so in this case All electronics should put in main part of Talkman.
Needed GSM-services in priority:
- GSM network status & PIN management
- Phone call/answer
- Name list management (on SIM)
and lowest - SMS reading/writing or autoanswer/forwarding to other gsm number
Keyboard
- 4x4 keyboard
- on/off power switch and small s-button, top side
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- buttons left side
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- CS, M, R buttons, right side
Lights (leds) under keyboard
- HF - hands free
- CALL
- SERV
- ROAM
and without text
- power
- 2x orange leds in middle
- LCD and keyboard backlights
connectors
- From handle to phone : 25 pin D-port
- Antenna port (SMB, need to change)
- 6 pin port for power, external antenna, hands free etc (need to change)
I will open Talkman soon, and if you have hw or software related questions, shoot them. I will collect answers and write them here. Also if anyone have answers for these questions, you are free to help me/us.
At least I need to find what LCD controller is used and can it be use by arduino or in worst case I need to measure LCD size and find new LCD or LED screen instead.
Second question is that what kind keyboard matrix is on handle.
Last what I will check is handle connectors wiring. Are all wires usable in project.
With GPRS shield I have one Mega, two arduino mini pros, leonardo and 12v to 5V DC converter. Also I have LiOn charger board and DC booster to 5v.
-Jafarin
PS. Yes this mail might be confusing, but so I am