Hello all,

sorry for a long mail, I just want to keep things at one place.
I repeat once again, that the chatboard I've used is for 3V phones,
there are some photos of this device at
	http://www.mobil.cz/mobilni_komunikace/mobilni_telefony/abecedni_prehled_mt/sonyericsson/chatboardproericssony.html

Right now I have Chatboard before me (I forgot screwdriver at home,
and it took me 2 screwdrivers and 6 screws to open it, so appreciate
that;)). The board looks like this:

                 here was the
 ______________    connector   ______________
|            o |______________| o            |
|               | |  ||||||||      ####      |
o>              + G  nSnTRnnn      chip     <o
|               3 N  c c  ccc      ####      |
|                 D                          |
| o                                        o |
 \__________________________________________/

connect +3V from Agenda to +3,
connect GND from Agenda to GND,

place some resistor (100 ohm in my circuit) between +3V and S
	(which appears to be 'keyboard select')

connect TX from Agenda to T,
connect RX from Agenda to R.

Just few remarks: When desoldering the connector from Chatboard, use
high temperature if you can, and possibly some flux. The tin melts at
very high temperature :(.

If you break the soldering pads, don't worry, you can solder the wires
and resistor directly on the SMD components, there is a lot of place.

I've glued the outgoing cable to the place where those pads used to be,
to make sure I won't rip the wires from the board.

Testing: start microcom, set 9600, 8n1, turn off the flow control
(if it is possible - I cannot test it at the moment), then connect
the keyboard. It should start repeating
	AT
at the beginning of line. The communication software will come later;
if you want to play, just answer OK to any message you'll see.

Note the nice plastic case on one of the images from the URL above.
I've cut a small square in it, so I can put Agenda connector there, and
close the case.

Btw, I am absolutly unsure about meaning of 'S' pin, to which the resistor
goes from +3. Maybe no resistor is needed (just a wire, but I won't try it
on mine;), maybe bigger value will do better.

And for your convinience, connector on Agenda looks like this:
	1 3V
	3 GND
	6 TX
	8 RX
	(http://www.cs.umbc.edu/~acedil1/agenda/connector.shtml)

no warranty & best wishes :),
	Milan

On Fri, 13 Sep 2002, Milan WWW Pikula wrote:

W>Hi,
W>
W>I apologize for not sending the kernel and pmon changes, I'm
W>absolutely busy :(.
W>
W>But one of major disadvantages of Agenda for me was a lack of keyboard.
W>I've found the Ericsson Chatboard keyboard (it's really cute,
W>have a look at http://www.expansys.com/product.asp?code=ERICCHA101 ),
W>connected it to Agenda and want to tell you the story.
W>
W>1) the price of keyboard was low, about $8. Supported ericsson phones
W>are 3V devices, so I thought: Agenda is 3V device, that will work.
W>We will need few wires, and Agenda connector. I've bought one.
W>
W>2) I've opened the keyboard case, desoldered original ericsson connector,
W>soldered 4 wires (+5, GND, TX, RX) to appropriate positions. Warning!
W>The tin, used in chatboard, melts at very high temperature.  I broke
W>the soldering pads by holding the soldering iron too long there, while
W>waiting for tin to melt. But it doesn't matter, you can always solder
W>the wires at one side of SMD components, and it holds quite good.
W>
W>After few experiments, I also had to add a resistor between +3V to
W>one undocummented pin which appears to be keyboard-enable (100 ohm
W>or such).
W>
W>Of course, I've soldered the second side of cable to Agenda
W>connector. I'll upload photos when someone hands me a digital camera.
W>Until then, find some ericsson connector pinout on google.
W>
W>3) I've coded a simple perl script, which communicates with the keyboard.
W>The keyboard thinks I'm a mobile phone, and sends me AT commands. Just
W>respond OK to any of them and you're done. It works regardless echo
W>settings, so disable echoing. You can try microcom, but I'm unsure
W>wherther it will work, because on startup, the keyboard says 'AT' in
W>one-second intervals, and you will probably need to scribble 'OK<enter>'
W>faster than that time.
W>
W>4) Well, it works, I can read the keyboard codes. First I thought
W>the keyboard is very slow, but it turned out to be sending characters
W>on key-release, instead of key-press.
W>
W>If you cannot stand such functionality, I don't recommend you
W>to buy the chatboard.
W>
W>Also, there is no CTRL key on the keyboard, and there is no ENTER, but
W>the latter can be solved by keys for dialing (YES and NO), which are nearby.
W>It is hard to hold the keyboard and Agenda at the same time. On the
W>other hand, the keyboard is really small and can be easily transported.
W>
W>5) future. One day somebody will have to write a kernel driver for the
W>keyboard. I suggest to implement is as line discipline, so you can switch
W>the keyboard on/off by one stty command. Also, it is safe to say 'OK' at
W>random times, so the software should do it immediately on startup to
W>recover device from possible answer-wait. I'm not sure whether I'll
W>have the time to implement a driver, so I'll be glad if someone else
W>does it.
W>
W>	Milan
W>
W>

-- 
Milan Pikula, WWW. Finger me for Geek Code.
http://fornax.elf.stuba.sk/~www, www@fornax.elf.stuba.sk
.. dajte mi pevnu linku a pohnem zemegulou ..






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