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31  Forum 2005-2010 (read only) / Exhibition / Re: Arduino Pong on: September 10, 2007, 03:46:34 pm
I tried it with an atmega8 and atmega168 (arduinoBT) on my trusty self made beamer (slide-projector with pocket TV screen). While arduino pong seems to be just the perfect new companion for this beamer (which is not really usable for anything fine grained like a movie...) I see a second ghost picture. Also none picture has the right height. Is it maybe the cable lenght? I have roughly 1,5 meter.
I see many settings in the header, but when I change e.g. WIDTH, HEIGHT or DISPLAY_LINES it only gets worse, showing out-of sync artefacts...
Any hints?
I haven't looked to close at the code, but I assume that touching e.g. DISPLAY_LINES must mess up the timing, right?

regarding the resistors: I simply use three 1K potentiometers for all values and I see most changes when truning the 75 ohm one. But it looks not that picky... 100 ohm could also work I guess.
Hmmm, maybe I have some naughty analog filter effect due to the pots (acting as inductors) which causes  ghost images?
32  Forum 2005-2010 (read only) / News / Re: Illuminato X Machina: modular OSHW, ARM+Arduino on: August 20, 2009, 06:56:24 pm
Wow, the boards look really smart and well engineered!

But, honestly, what would one actually want to do with those?
Maybe heavy number crunching, but that doesn't really sound like something the typical arduino or DIY user would need... By them it could be seen as a very expensive LED Matrix Display... smiley-wink
I really don't like asking this kind of killer argument questions, but in this case I just have to.

Btw, the transputer came to life again at www.xmos.com. They are about to release a board with a grid of 4x4 chips on it. With 4 cores in each chip, that makes a total of 64 cores multiprocessor power.
And they have a C-based language, which has distributed thread control and communication right build into it.
33  Forum 2005-2010 (read only) / News / Re: Open source Project / Hardware on: August 23, 2007, 11:28:37 am
Well, I would like to see and expect a difference in buying parts needed for an open source hardware project and buying commercial customs.
The resulting problem of keeping productions files closed is, that there's only one single source. Which is completly contrary to an open advertisement. Daniel has an interesting point with his estimate, that the production cost is actuallly more like 10$ for Arduino boards. I recently stumbled upon this: http://www.pollin.de/shop/shop.php?cf=detail.php&pg=NQ==&a=MTY5OTgxOTk=.
Ok, it doens't come with an Atmega8 (because you can choose between several ATmegas and ATtinys) and there's no FTDI USB serial converter. BUT, please note, the PCB uses more than twice the area of an an Ardunio Board, has many many more parts on it and is still only 15 Euro. And like it's with nearly any board, whicht features an Atmega8 or 168, you could use it as a replacement for an original arduino board - if, but only if, you are experienced. (I'm speaking in general of ATmega boards from manufacturers that probably even don't know about the existance of the ardunio project, e.g. like pollin.. :-) )

Why should only people with experience in electronics have the opportunity to try out Arduino at lower costs, with lower priced boards? Esp. when its a known fact, that those experienced poeple are not the majority of ardunio users.

Really, I don't want to offend any developer now, but look at what's the ardunio board when it comes down to the schematic.
It's not more than a combination of the Atmel AVR Atmeg8 reference design together with the FTDI232R Serial-USB chip reference design. Even the serial bootloader idea isn't original.
It's the software (the IDE and the libs) that make ardunio great and usefull!

Why should the constantly growing arduino community still rely on a very commercial distribution of the main component?

Oli
34  Forum 2005-2010 (read only) / News / Re: Open source Project / Hardware on: August 17, 2007, 05:39:25 pm
One question, that wonders me allways, when talking about open hardware in general, is:

How could people actually participate in the design process of the hardware?

Think of the versioning systems (code managment systems) that exist for software sources (svn, cvs etc.) and imagine using them to keep track of hardware sources (files).
Anyone allready thought about submitting patches for hardware related stuff?

A simple netlist as textfile could at least represent a schematic. OK, I don't know, how we could generate graphical representations of the netlists, but I think such a system would be very cool and usefull. Maybe the open electric cad project http://www.geda.seul.org/ is a good starting point.
I know that automatically generated PCBs offer a whole univeres of problems in their own... But maybe their is demand and use for a middleway between manually doing the finish - component-by-component layout task - and letting users allow to conrtibute to the boards features and its variants in a rough, sketchy way.

I think if a hardware dependant project is also driven by a community, it would require thoughts in this direction - ways to allow some kind of teamwork, not only on the software, but also on the hardware description files.

Would this be something appreciated by the arduino crew and users?

Oli
35  Forum 2005-2010 (read only) / News / Re: Open source Project / Hardware on: August 17, 2007, 06:06:20 am
Well, as I said before, I don't see cheap arduino boards flooding the market, as a result of production files beeing released. The arduino boards aren't expensive, I guess anyone knows that by now. Even the bluetooth board's pricing is fair (is there someone who found a single pice Bluegiga WT11 chip vendor selling not exclusively to business people?, I couldn't...).
I'm quite shure the arduino creators don't make much money out of selling the boards, just because there is not much room for profit. The very few people, trying to get some cheaper boards form china would shurly discover high shipping costs and other problems. At least as long as the demand for arduino boards is below typical consumer electronics distribution volumes... ;-)

Also there are so many Arduino-like boards (I'm speaking of the ones with just an ATmega 8 chip), so no one can really speak about intellectual porperty, that has to be hidden for the sake of making profit.
For me it's more a question on principle.
As a community member, I'd just feel better if the hardware is handled like the very same as the software is.
Concerning the ardunio clone/alternative board builders (the ones created for use with the Arduino IDE), I can - at the moment - see reason for not publishing their complete cad files.
Why should they do it, if the core project has no clear opinion and is enventually not releasing all files?

Regards,
Oli
p.s. of cources I'm also a supporter of local production. I just say realeasing the files would most probably not hurt there.
36  Forum 2005-2010 (read only) / News / Re: Open source Project / Hardware on: August 15, 2007, 04:45:35 pm
I'm also wondering about the state of an open hardware approach. The well written arduino paper for the chi 07 conference in march (it's in the news archive) gave me the impression, that arduino is still an open project from any perspective. So I thought updated cad files would follow some day...

What's the real problem with showing the electric board designs? I really can't imagine that anyone would try to make cheaper boards from the files. But I guess that many would like to learn, adopt and shurly feed their own board designs back to all. I know by myself, that board layout is hard work, but there's also the arduino software, which is completley released and probably much more work.
Why differentiate and treat them different?

Oli
37  Forum 2005-2010 (read only) / News / Re: Arduino Diecimila and BT eagle files available on: October 22, 2007, 03:43:15 pm
Finally! Great!
38  Forum 2005-2010 (read only) / News / Re: freeduino universe on: September 12, 2007, 06:17:32 am
Great idea, Ryan!
I think thats a similar idea like the one at tinker.it. An arduino, and more, consultant center ...
And in my opinion that's the only nice way to get profit out of an (meant to be smiley-wink open source project.

I only wonder how such a think could work collaboratively....
39  Forum 2005-2010 (read only) / News / Re: Turn on LED with mobile phone! on: February 25, 2006, 11:03:57 pm
great, massimo!
please release it.

Thanks,
Oli
40  Forum 2005-2010 (read only) / News / Re: My Arduino Project Blog on: March 08, 2006, 02:57:51 pm
nice project, bod!
If theres enough time, maybe I'll contribute something if you want. How about using arduino directly to listen to midi?
Some simple analouge filters attached to arduino's analog ins could provide basic sound-to-light control capability...
41  Forum 2005-2010 (read only) / News / Re: Hands on examples on: February 25, 2006, 11:12:36 pm
@david
what about a wiki area, thats editable by all?
that works pretty well on this (german only) microcontroller diy tinkering page:
http://www.mikrocontroller.net/articles/Hauptseite
people even wrote arcticels about soldering and smd part numbers etc...

Oli
42  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: graphical lcd (nokia 3310) on: March 29, 2006, 04:06:18 am
well, I mean, connect the LCD Vdd pin with the diodes or a regulator to 5V... :-)
43  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: graphical lcd (nokia 3310) on: March 29, 2006, 03:49:47 am
lekuk, the problem is that voltage drop over a resistor depends on the current. With a diode the volatge drop is in theory independent from the current (practically, as you observerd, not really). If you know how much current the LCD draws, you can in deed calculate the resistor for 3.3Volt (R=U/I with U=5-3,3V). But that's even worse compared to the diodes, because the current the LCD draws will allways depend on the volatge it's driven by! And the resistor must be able to handle the electrical power, that it should drop-out.
Think of a regulator as a set of diodes/transistors that output a certain voltage level independent from the current that's drawn on the output. But, like a resistor, they just "burn" the difference voltage (i.e. create heat!).

One thing I don't understand in your drawing. Why do you connect the LCD Supply pin (Vdd) with an digital IO of Arduino? Just connect it with 5V. Maybe the problem is, that the current the LCD needs is above what an arduino pin can handle.
44  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: graphical lcd (nokia 3310) on: March 27, 2006, 12:58:25 pm
I still had no time to test the lcd with the given code by myself. The diodes are just for lowering the voltage (each diode burns 0,7 V) since that LCD is usually powered with 3,3V.
I don't know if it works with 5 volt, too. If so, it should also work without any resistors.
45  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: graphical lcd (nokia 3310) on: March 16, 2006, 05:51:40 pm
you can connect it like shown here, but with one more diode for roughly 3 Volt:
http://ulrichradig.de/site/atmel/avr_mmcsd/gfx/MMCSDSCH.JPG
(thats actually for a 3,6V MMC/SDC card, but the interface is the same, SPI Bus...)
be carefull when soldering, the metal spring-contacts are really tiny. here's info on how to take the LCD apart from the phone: http://serdisplib.sourceforge.net/ser/pcd8544.html
I'll try massio's code soon, too. If it won't work, I've allready made a C code for msp-gcc that could be easily ported. I got my displays also very cheap (as replacement parts, it's the same for nokia 3310, 3330 6210 etc., see link) from ebay.
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