Wallboard 2.0 - Revision history

imported>Ardillo: /* Researching */

2014-01-14T20:19:51Z

Researching

← Older revision		Revision as of 20:19, 14 January 2014
Line 39:		Line 39:
	We've opened one of the led boards, and found some interesting strings on the boards themselves, to help us identify the source of the boards and to find others working on it.		We've opened one of the led boards, and found some interesting strings on the boards themselves, to help us identify the source of the boards and to find others working on it.

	- http://forums.bit-tech.net/showthread.php?t=177960 <br>		* http://forums.bit-tech.net/showthread.php?t=177960 <br>
	- http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/Abstract_3835-Kalk_DE.pdf <br>		* http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/Abstract_3835-Kalk_DE.pdf <br>
	- http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/NXP3835.zip The .zip contains a .pdf with circuit drawings <br>		* http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/NXP3835.zip --> The .zip contains a .pdf with circuit drawings <br>

	== Arduino code ==		== Arduino code ==

imported>Ardillo: /* Researching */

2014-01-14T20:18:18Z

Researching

← Older revision		Revision as of 20:18, 14 January 2014
Line 39:		Line 39:
	We've opened one of the led boards, and found some interesting strings on the boards themselves, to help us identify the source of the boards and to find others working on it.		We've opened one of the led boards, and found some interesting strings on the boards themselves, to help us identify the source of the boards and to find others working on it.

	http://forums.bit-tech.net/showthread.php?t=177960		- http://forums.bit-tech.net/showthread.php?t=177960 <br>
	http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/Abstract_3835-Kalk_DE.pdf		- http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/Abstract_3835-Kalk_DE.pdf <br>
			- http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/NXP3835.zip The .zip contains a .pdf with circuit drawings <br>

	== Arduino code ==		== Arduino code ==

Fish at 06:54, 27 November 2013

2013-11-27T06:54:55Z

← Older revision		Revision as of 06:54, 27 November 2013
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	</pre>		</pre>
			[[Category:Projects]][[Category:Arduino]]

imported>Combuster: /* Arduino code */

2013-11-26T22:07:41Z

Arduino code

Show changes

imported>Ardillo at 17:34, 26 November 2013

2013-11-26T17:34:23Z

Show changes

imported>Jeroenh: /* Open Problems */

2013-11-22T22:37:34Z

Open Problems

← Older revision		Revision as of 22:37, 22 November 2013
Line 34:		Line 34:

	It looks like the reverse engineering was not complete, or has not been documented fully...		It looks like the reverse engineering was not complete, or has not been documented fully...

			== Researching ==

			We've opened one of the led boards, and found some interesting strings on the boards themselves, to help us identify the source of the boards and to find others working on it.

			http://forums.bit-tech.net/showthread.php?t=177960
			http://www.circuitcellar.com/contests/nxpmbeddesignchallenge/winners/DEs/Abstract_3835-Kalk_DE.pdf

imported>Jeroenh: /* Open Problems */

2013-10-15T20:53:21Z

Open Problems

← Older revision		Revision as of 20:53, 15 October 2013
Line 28:		Line 28:
	== Open Problems ==		== Open Problems ==

	* The text we send is displayed and flashes by very quickly, and repeats very quickly which is not what is supposed to happen.		* The text we send is displayed and flashes by very quickly, and repeats very quickly which is not what is supposed to happen.
	* Sometimes the write operation just plainly does nothing or freezes what is there.		* Sometimes the write operation just plainly does nothing or freezes what is there.
	* The Wallboard not only receives bytes, but also sends bytes back. Sometimes it just echoes back what you sent, but other times other stuff gets sent back. We have no idea what that is.		* The Wallboard not only receives bytes, but also sends bytes back. Sometimes it just echoes back what you sent, but other times other stuff gets sent back. We have no idea what that is.


	It looks like the reverse engineering was not complete, or has not been documented fully...		It looks like the reverse engineering was not complete, or has not been documented fully...

imported>Jeroenh: /* Open Problems */

2013-10-15T20:53:11Z

Open Problems

← Older revision		Revision as of 20:53, 15 October 2013
Line 28:		Line 28:
	== Open Problems ==		== Open Problems ==

	- The text we send is displayed and flashes by very quickly, and repeats very quickly which is not what is supposed to happen.		* The text we send is displayed and flashes by very quickly, and repeats very quickly which is not what is supposed to happen.
	- Sometimes the write operation just plainly does nothing or freezes what is there.		* Sometimes the write operation just plainly does nothing or freezes what is there.
	- The Wallboard not only receives bytes, but also sends bytes back. Sometimes it just echoes back what you sent, but other times other stuff gets sent back. We have no idea what that is.		* The Wallboard not only receives bytes, but also sends bytes back. Sometimes it just echoes back what you sent, but other times other stuff gets sent back. We have no idea what that is.


	It looks like the reverse engineering was not complete, or has not been documented fully...		It looks like the reverse engineering was not complete, or has not been documented fully...

imported>Jeroenh: Created page with "A followup project to the reverse engineering of the Wallboard. =Wallboard Reverse Engineering= The first project reverse engineered the Wallboard protocol through a Moxa..."

2013-10-15T20:52:25Z

Created page with "A followup project to the reverse engineering of the Wallboard. =Wallboard Reverse Engineering= The first project reverse engineered the Wallboard protocol through a Moxa..."

New page

A followup project to the reverse engineering of the [[Wallboard]].

=Wallboard Reverse Engineering=
The first project reverse engineered the Wallboard protocol through a Moxa eth-rs232 controller and a cable. The cable has gone lost unfortunately.

=New Project=
The new goal is to connect a Wallboard to a Raspberry Pi in some way and make a Wallboard available as a clock with extra functions.

A first attempt was to use the serial interface of the RPi directly. Unfortunately, the RPi only has 3.3V and the Wallboard likes to have 5V for its interface. The end result was that the current Wallboard text was deleted, but nothing else could be gotten out of it.

A next attempt was to create a USB to audio-plug cable. We re-used the cable to the RPi serial, and connected that to a serial cable, and used an FTDI chip to convert it to USB. Using a Python program below we managed to get some text to get displayed on the Wallboard.

We searched on Farnell for parts to make this into a nicer cable, and we actually managed to find just [http://nl.farnell.com/ftdi/ttl-232r-aj/cable-usb-ttl-ser-conv-aud-jack/dp/1740361?ref=lookahead just the right cable]. The only problem was that the receive and transmit was swapped (probably). We tested them and confirmed that they did not work out of the box. We swapped the cables and it still did not work.

Whipping out the logic analyser we found that the signal on the transmitting was inverted compared to our previously hacked together cable. Fortunately, this cable has a programmable FTDI chip, which can be reprogrammed using the [http://www.ftdichip.com/Support/Utilities.htm#FT_Prog FT_Prog] application from [http://ftdichip.com]. We successfully inverted the Rx and Tx signals, and we replicated the results from our previously engineered cable.

== Python implementation prototype ==

<pre>
import serial
a = "\x02\x80\x80\x7e\x03"
port = serial.Serial("/dev/ttyAMA0", baudrate=1200,timeout=1)
port.write(a)
port.close()
</pre>

== Open Problems ==

- The text we send is displayed and flashes by very quickly, and repeats very quickly which is not what is supposed to happen.
- Sometimes the write operation just plainly does nothing or freezes what is there.
- The Wallboard not only receives bytes, but also sends bytes back. Sometimes it just echoes back what you sent, but other times other stuff gets sent back. We have no idea what that is.

It looks like the reverse engineering was not complete, or has not been documented fully...