Monster
iCruze displays
A nice 2 x 20 backlit surplus
display very useful for DIY projects
As used by Time Nuts
Last update: 11-04-2010
This page will be updated as I
get new data.
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03/24/2010
Some history:
Around
2005 an audiophiles (or
should I say Audiophools?)
accessories
company
called
Monster Cable
Products Inc, launched an innovative system to connect an iPod to the
car audio system, making the car’s radio think the iPod was a CD
changer and thus allowing to control the iPod from the radio controls,
including the
mounted on the steering wheel, if any.
The system had an optional $100 display
(which is what this is all about) which shows the song title and artist
name, as stored in the iPod files.
An iCruze complete system The display (the text is simulated)
For
some reason that I ignore, but probably a sales fiasco since the basic
system
was sold by some $200, this nice system became a kind of Ford Edsel. If you try to search for any reference about
it in the Monster web site as I did (http://www.monstercable.com)
you
won’t
find
anything,
as
if
the
system
had
never
existed
(anyway
internet
has
its
memories
and
yes,
it
did
exist).
The first time I knew about those displays was in the Time-Nuts list. One member of this list, Didier Juges KO4BB, had designed and built a standalone monitor for his Trimble Thunderbolt GPSDO (http://www.ko4bb.com/Timing/GPSMonitor/) and released his code under GPL. Other members of the list soon noticed that copies of Didier’s monitor were being sold on eBay by a Chinese store. The owner of this store is Bob Mokia (http://myworld.ebay.com/fluke.l/), a well-known supplier of surplus time nuts goods. He got a batch of iCruze displays (probably the actual factory was on China), replaced the microcontroller board with one of his own, programmed it with the Didier’s code and made some changes to the original cable.
Didier’s Thunderbolt monitor in the iCruze display, as sold by fluke.l
Another member of the list, Arthur Dent, bought one of Bob’s monitors for his Thunderbolt. He removed the case and integrated the electronics and the bezel on his own cabinet. He was the one who discovered the gadget’s origin and found that some outlets in Amazon were dumping them at $2 each, so he also bought one hoping that he could use it someday.
The monitor integrated in Arthur's GPSDO, among other of his Time Nuts’ stuff
I found about the existence of the cheap sources through Arthur, who kindly sent me a picture showing the internals of the original unit and the one modified by Bob. It can be seen that the original PCB holding the microcontroller was replaced by a new one with the component side reversed. The reason for replacing the board is because Didier’s code runs in another family of micros and it seems that Bob took the hardware way instead of porting Bob’s 8051 code to the Atmel TINY micro. Another reason could be that the existing micro lacks the resources needed for the task.
Pictures showing the inside. The original is at the bottom and the modified one at top
I bought
some of the original displays from an Amazon seller. I had previously
made before some gadgets with LCDs, mainly Frequency Counters and
Digital
Dials for Boatanchor radios and I had
found that the most difficult thing to properly finish the enclosure
was the cutout for the display or the lack of a suitable bezel.
These displays have a nice bezel and even
in
some cases everything could be included into the original cabinet in a
fashion as Bob did with the Thunderbolt monitor.
After
reading the thread about this
subject in the Time-Nuts list I played with the idea of recycling the
whole gadget without removing or replacing the microcontroller board.
For some uses just reprogramming the
micro
could be enough; or even innecessary.
Imagine that the toy is just a serial 20 x 2 ASCII terminal, so
that you can send the data you wish to display just to the current
cable. Your code would have to send the
data to a
kind of serial port, instead of to a display driving routine and the
display could be located some distance away, which could be
advantageous in some cases .
Later I
received several emails from more list members who had also bought some
displays and wanted information. This is
why I started this page.
I tried to get as much info as I could and began to reverse engineer the gadget. After capturing the schematics and once seen how it was powered (it was an automotive application, but I didn’t know what was on the other side), I applied 12 volts on the input cable between the red and black wires. The backlight turned on but nothing appeared on the screen. I began to probe everything with a scope and the only activity that I found was a pulse train on the yellow wire, with a negative going pulse of about 2 ms every 1.6 s; maybe it is trying to wake up the other side.
This is the schematic, it can be downloades in both Eagle.sch
and .png
formats
The display module is a
HY-2002A-803, its info is at
http://www.ciahk.net/upload/docs/HY-2002A.pdf
and HERE.
As stated in the datasheet the controller
chips are either SPLC80A
or KS0066;
they
use
potted
bare
chips,
so
there
are
not
markings
but
from
a
practical
point
of
view
both
can be considered the same.
I though
that the top row of pads
(P1-P6) were for programming, since this is compatible with standard
AVR
means. This has been tested and it is true. Also
it
can
be
thought
that
the
yellow
and green wires going to the external world looks like the
connection to
an I2C bus, given they are connected to the SCL and SDA pins. It would be very useful if anybody with the
right tools do some tests (send text from an I2C device …), but the
tests done so far have been negative.
Looking more carefully I found another signal related to the above mentioned. It is at pin 9 but it doesn’t go anywhere. There are provisions on the PCB for a resistor and a diode in series (R11 and D1) connecting this pin to ground, but they are not installed.
In this scope picture the top trace is from pin 9 and the bottom from
pin 3. Both signals span from 0 to 5 V, the time base is set at .5
ms/cm and the repetition rate is 1.6 s (sorry for the quality, but
taking this picture was a kind of a project in itself. Someday
I will buy a scope camera carcass to mount a digital one inside).
If somebody gets more information and find more ways to use these
displays, please send me an email with your
findings and I will post them here.
04-18-2010 Mark Sproul KB2ICI, who bought 20 units for $2 each (shipping included), tells me that he had tested the device using an Arduino with a test program that he made and it seems that the connections are not I2C. He had connected the above mentioned pads P1-P6 to a programmer and he had success reading the code inside the ATtiny. He is going to continue his investigation and will try to reprogram the micro to do something useful. The story of his tests and developments are on his page "Hacking the iCruze Display".
04-23-2010 Due to the use of Word 2007 for doing some editing,
this
page had shown various errors when viewed on Internet Explorer, while
it was ok on Firefox. I had to make it again, this time using
Sea Monkey Composer.
04-24-2010
Mark has made a big progress on his tests.
He has reprogrammed the micro and a first version of a program
that displays ASCII text using the current
cable is
working. A final version will be ready soon.
04-26-2010 According to Mark, he has finished his program for the display. It accepts serial data at 9600 bd with TTL levels. He have the details on his web page and he will post the code as soon he finishes some more tests.
04-27-2010 The program, both source and .hex can be downloaded from Mark's page. He also has posted a full explanation on how to program the device and a modification for using 5 volts instead of 12. I didn't programmed any of my displays yet, because I don't have an AVR programmer.
If anybody needs a
makeshift programmer, here
is the cheapest one that you can imagine (link courtesy of
Roberto Barrios, EB4EQA). I'm going to build one and give it a
try, since I don't have plans to use AVR micros, otherwise I would buy
the same used by Mark as described in his page.
11-03-2010
Since there are not doubts about the
function of the P1-P6 pads (programming), the schematic has been
updated accordingly.
At last I have a
working homebuilt Digital
Scope Camera. As soon I take a picture of the above signals
with it I'll post it here.
11-04-2010
I have the picture. What a
difference, isn't is?
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