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136  Using Arduino / Installation & Troubleshooting / Re: Arduino Uno no OUTPUT on digital pins on: April 23, 2013, 02:26:40 pm
What is your setup() function like?

are the led pins set as OUTPUT, using setMode() ?
137  Using Arduino / Programming Questions / Re: Not Enough Analog Out pins on: April 23, 2013, 02:25:37 pm
I only have 3 analog outputs left but a lot of digital pins.

I am a bit lost here... what do you mean?

AFAIK, analog outputs are simply digital pins. They are the same thing.
138  Using Arduino / Networking, Protocols, and Devices / Re: Arduino on the Internet. problems with port forwarding? on: April 23, 2013, 01:35:00 pm
It is wrong.

You forwarded port 80 on protocol UDP. A web browser works on port  80 protocol TCP. Change it to TCP 80 and it should work.
139  Using Arduino / Microcontrollers / Re: Looks like we have clones that look real on: April 23, 2013, 01:29:34 pm
I got mine from china knowing it was a clone. It does NOT say Made in China. It works beautifully, so there are no complaints there.

I have however, been using a clone I built myself:

and I am very proud of my own clone. there is no USB interface on it, so I use it with a FTDI adapter.
140  Using Arduino / Programming Questions / Re: Not Enough Analog Out pins on: April 23, 2013, 01:18:21 pm
I am using the adafruit 2.8 TFT display and it uses all of the analog pins except 42, 44 and 46 so I am using one pin(44) for all four of the motor controllers. I would really like each to have its own signal. Can this be done some other way?

You have 3 available output pins, and that's excellent news!

You can wire a 74HC595 to those 3 pins and that will give you 8 output signals. In short, you'll communicate serially with the 595 (thus the need for only 3 pins) and it will give you 8 parallel outputs, or, in other words, the 595 will work as a port multiplexer.

More here:

141  Using Arduino / Project Guidance / Re: Extending an android phone into car dashboard compleatly. on: April 23, 2013, 11:41:32 am
Latest android phones have a Micro-USB Port that support MHL; MHL Is basiccly an HDMI Port combined into a standart micro usb plug.
My Idea is extend both screen and, at least to some degree, extend also the touch interaction.
ver a bluetooth with arduino? c) is there a compatible touchscreen that I could read values from?.

That is: until Samsung broke the standard with the Galaxy S III.

In order to make the Galaxy S III's [supposedly] MHL port work, you need to buy an expensive adapter from Samsung, that sits between the HDMI output device and the phone.  The adapter from the Galaxy S II will NOT work with the S III.

So, it is no standard at all, because those %$!@#* keep on creating their own implementations of the standard just to sell more shit to us.

142  Using Arduino / Installation & Troubleshooting / Re: Arduino stops compiling halfway through??!! on: April 23, 2013, 10:12:31 am
If you have enough RAM on your computer, create a ramdrive (using imdisk, freeware w/ source), set the RAM drive as your temp drive, and what all your compiles finish in less than 10 seconds.

Since I have RAM to spare on my development machine, and I reserved 2Gb for a imdisk RAMdrive, which gets created at boot by a script (.bat), that also sets the TEMP path variable and a few other settings. This approach drastically reduces disk writes, which improves overal performance and extends the HDD's lifespan.
143  Using Arduino / Project Guidance / Re: Logarithm of a 0<X<1 on: April 23, 2013, 10:05:33 am
Have you tried making log(2) a constant, and use that throughout your program?

const float LOG2 = 0.30102999566398119521373889472449;

Note: you may have to crop some decimal places there!

And then:

float log2 (float x) {
  return (log(x) / LOG2);

That will not only make your program a lot faster (because log(2) doesn't ever need to be calculated), but it will ease the burden on the Arduino.
144  Using Arduino / Installation & Troubleshooting / Re: Leonardo hangs up everytime I upload a specific sketch on: April 23, 2013, 09:59:18 am
You are probably exceeding your [very limited] RAM usage. One suggestion is to move your int vectors to flash memory (aka PROGMEM). 

Read more about it here:

145  Topics / Device Hacking / Re: Arduino to Printer through Parallel Port on: April 23, 2013, 09:56:17 am
This will be great for sending ESC/P2 codes to Epson dot matrix printers.

146  Community / Bar Sport / Re: Be DIFFERENT! make good posts! on: April 23, 2013, 09:47:08 am
You had only 2 posts prior to your rant and yet you feel at home enough to insult hundreds of users? Ouch!

My native tongue is Portuguese, and even although I consider my English pretty good and I can hold a conversation (but not write) in Spanish, Italian and French, I am a bit offended by your post.

On the other hand, since this is an international forum, and the internet has lifted many borders, one should only appreciate the effort a non-English speaker is putting on trying to communicate to you, native English speakers. Not many people have the ability to easily learn a new language, but yet they are trying. I applaud these people: they are not afraid to show they are *still* learning. Perhaps their post tomorrow will be better: they might have learned a new word, or learned how to properly write whatever word they wrote incorrectly yesterday.

I think most of the posts in these forums are in English, but if there would be an "official" language for these forums, I am sure it would be Italian, because that's what the creators of the forums speak. If that was the case, how much effort would you be willing to put into learning Italian? Or would you just turn around and look for an Arduino forum in English, or maybe a more technical AVR forum?

My point is: don't take it for granted that you can use English here. Appreciate it, and appreciate the fact that others are willing to learn YOUR language just to learn more from you (not you specifically, but people much more knowledgeable than you that are very helpful in these forums).

I was in Argentina a couple weeks ago, and I noticed they are far more receptive to people who at least try to speak to them in Spanish, even if their Spanish suck. The same applies to anywhere in France: try being a tourist there without even knowing how to say 'merci beaucup' or 'bonjour', and they will spit on your coffee. So would I.

Being culturally-tolerant is important these days.

Now, about the technical aspects of your complaint, I partially agree with it. Most posters would have a higher chance of a quick answer if they just googled for it or used the forums' search feature. Everyday there are at least 10 questions on how to use a stepper or a servo. Besides, 90% of the Arduino books don't bring anything new to the scene: they all teach the same stuff over and over. That is not to mention the thousands of blogs that will teach you how to turn a LED on.
147  Community / Bar Sport / Re: What have you made out of old circuit boards? on: April 22, 2013, 02:04:27 pm
If you want a pentium pro or other bad boys, be prepared to pay $40 each. I'd be interested in making a belt buckle with one of these if I know how to make belt buckles.

What a great news! Really!

I have a couple of those. They are so old I thought they were worth nothing. I don't actually collect old CPUs, but I have lots (60+) of them, of all kinds, from 1993 and beyond. I must have Cyrix 486s, all sorts of Intel (including 2 Pentium Pros), AMD, and so on. I have several generations of Pentiums, including Pentium I, Pentium MMX, Pentium Pro, II, III, 4...

148  Using Arduino / General Electronics / Re: first pcb try on: April 22, 2013, 12:07:09 pm
Edit: Never mind I searched for it on google. But what other transfer methods are their?

Ok! So by now you know that a transfer method is how you go from the PCB's CAD (computer aided design), from whatever software package you are using, to have it printed on a blank copper board, ready to be etched by whatever method.

Toner transfer is one amog several transfer methods. I like it because I have a good laser printer and it is one of the cheapest of them all. I usually use glossy magazine paper (I prefer to use some of my wife's magazines because they have very thick and glossy paper, which is better for this purpose). I've also resorted to transparencies. Whatever paper/media you use, the method is still: print with a laser printer, using the darkest settings, and then use a very hot clothing iron to transfer the printed image to a black copper board.

Another method is direct printing. Some people have adapted ink jet printers to print the PCB directly to a blank copper board. This is fast and issues excellent results.

Although there are several other methods, the best method - quality-wise - however, is photo-transfer. It takes the longest and is the most expensive, but it also gives you industrial-quality results, or even better. You can have extremely low tolerances with this method.

There are other methods, like special papers, which are simply a variation of the toner transfer methods, but which are more expensive.

149  Using Arduino / General Electronics / Re: first pcb try on: April 22, 2013, 06:25:50 am
Hi, I have some questions.

I will try to build a breakout board for micro sd card (I know they exists but I want to build one myself, not ordering).
My plan is to attach a sd socket, tiny transistors and then in the end drill some holes so you could use jumper wires to attach the whole circuit board to your existing project. I will try to stick with surface soldering so the board could be very small and I don't have to drill so much holes.

I was wondering if it's possible to make a pcb that have that small lines? Don't know what the "lines" are called but will the iron chloride remove those or will they stay?

Tldr; How small and precious could you be when using the iron chloride method?

Those lines are called traces.

they can be very, VERY thin, but that are rules to how thin they should be. For digital signals (low voltage, very low current) width isn't much of a factor, but for power signals it is.

Take a look at this "Trace Width Calculator":

About ferric chloride: it can give very precise results. From my experience, what determines how precise and how thin your traces can be, isn't the etching method, but the trasnfer method. Some transfer methods issue much more precise results than others. I've had good experience with toner transfer, with traces as thin as 8mil, although 99% of the time I keep them wider than 15mil just for safety.

150  International / Portugues / Re: Programa para ligar dois motores de passo no arduino. on: April 17, 2013, 01:29:47 pm
Antes de mais nada, como os motores serão ligados ao Arduino? Através de um shield ou diretamente?

Se através de shield, qual o shield? Por qual IC é feita a interface com o Arduino?

Se diretamente, qual a potência dos motores, qual seu consumo de corrente, qual sua corrente de partida, etc...
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