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1996  Using Arduino / General Electronics / Re: Yet another question about an 8ohm speaker and volume on: December 12, 2013, 02:56:33 am

Dozens of things. For a start, the person who drew that has put the transistor on the wrong side of the speaker (you need a PNP where he put it). That's probably the only thing saving him from dumping 600mA through the speaker and making it a race to see which dies first...his USB port or the speaker.

1997  Using Arduino / General Electronics / Re: Yet another question about an 8ohm speaker and volume on: December 12, 2013, 02:43:37 am
I think I just need to get some sort of electronics bible.  Every time I think I might be getting somewhere, there's so much more I wouldn't even consider. 

I will find a book to buy, read it, and come back if I have more questions.

It won't help.
1998  Community / Exhibition / Gallery / Re: Project Bambino on: December 11, 2013, 04:37:15 pm
Why doesnt the ArduinoIDE erase the chip Before uploading?

It does.
1999  Using Arduino / General Electronics / Re: Adafruit NFC Shield - prototyping area? on: December 11, 2013, 04:33:23 pm
2 - If it is like a stripboard, those rows of holes are not interconnected like the strips on a breadboard. How do you connect 2 holes together?

To join two components just bend one of the legs across under the board and solder it to the other one.
2000  Using Arduino / LEDs and Multiplexing / Re: Problems with voltage using a few leds on: December 11, 2013, 02:07:22 pm
Quote
Coin cells can only supply a few mA
Is this only a behavior of coin cells? What about AAA batteries?

All batteries do it, but coin cells do it a lot more than AAA, AA, etc.

3xAA batteries is a good way to power Arduino projects.

If your peripherals need exactly 5V then add a voltage booster to them.
2001  Using Arduino / LEDs and Multiplexing / Re: TLC5940, problems with leds staying on after they are faded on: December 11, 2013, 02:01:56 pm
If i do a Tlc.Set(led, 0) after the fade the led stays off and the problem disappears, so i guess the problem is software, or maybe not working TLCs/Arduino?

Sounds to me like a bug in the 'fade' functions.

But you already have a workaround for it...
2002  Using Arduino / Microcontrollers / Re: New "Arduino" to beat them all. on: December 11, 2013, 01:58:35 pm
What you all seem to forget is that there are still 1000's of CNC machines out there running on DOS, yes DOS.

True, but they're already served by all sorts of devices.

That is the beauty of the X86, many to choose from, ranging from A86/D86 to Ida  to Nasm/Ndisasm to Borland, etc etc.
It all depends if one is compiling for DOS, Windows or stand alone (bare metal).
Of course there is also countless small Linux distros which will run on it and there one would use Geany as the front-end calling Gcc or even Bacon (via Bash).

It's a completely different kettle of fish to the normal Arduino where one always compiles for a stand-alone environment.
Also since the processor used is basically a Pentium, one could compile 16 bit code or 32 bit code or a combination of the two
by using different compiler directives.

All of that may be technically true, but none of it seems compelling. For the same money you can have something with connectors for screen, keyboard and mouse.

2003  Using Arduino / Microcontrollers / Re: New "Arduino" to beat them all. on: December 11, 2013, 01:56:42 pm
Since 99.99% of BIOS calls are standard for the X86 architecture, the API will be too.

That might be useful if the MS-DOS BIOS calls weren't about keyboards, screens, floppy disks, etc., none of which are available for this thing.

2004  Using Arduino / General Electronics / Re: Yet another question about an 8ohm speaker and volume on: December 11, 2013, 01:51:33 pm
There's lots of single chips that are designed for this. LM386 is common. If you need more power there's the LM4861, LM4889, etc.

You could also try the transistor method below.
2005  Using Arduino / Microcontrollers / Re: New "Arduino" to beat them all. on: December 11, 2013, 07:45:47 am
The fact that it's X86 is pretty "Wow!!!" due to the huge code base and tool chains that already exists for that architecture.

This is the part I keep seeing as an "advantage" that I understand the least.

What would you cite as an example of something this can do that can't be done better on eg. Beaglebone or Raspberry Pi (which are about the same price)?

If you can't recompile the software then there's no way to use the I/O on this. If you *can* recompile the software then surely Linux has far more, better "tool chains" than MS-DOS.

Maybe I'm underestimating the amount of x86 assembly language programs that need to be run on new+weird hardware in 2013, but I doubt it.
2006  Using Arduino / LEDs and Multiplexing / Re: Problems with voltage using a few leds on: December 11, 2013, 06:35:13 am
May be all of yours are right. I was using a 2 coin cell battery in series with 5.5 v and 600mAh.

There's your problem. Coin cells can only supply a few mA of current. 600mAh suggests a big one (CR2450?) but even a CR2450 can only supply about 25mA.

An Arduino+LEDs will draw far too many amps and the voltage will drop as a result.

2007  Using Arduino / LEDs and Multiplexing / Re: Arduino 17x18 Controlled Single White LED Ceiling using 74hc595 on: December 11, 2013, 06:32:54 am
I have included a current limiting 75 Ohm resistor on every LED in this design (maybe it is indicated a little small). This way the whole ceiling can light up without using multiplexing (and thus loose brightness).

Oh, I see. I didn't know they were resistors...

Why is it exactly that creating some patterns using shift registers won't work?

You can create patterns but PWM simply isn't going to work across that many rows with shift registers.


Are they not fast enough? Is the micro controller not fast enough?

Both.

I would love to trust you on your word, but I just don't understand why it shouldn't work

I'm not saying it won't work but you don't have enough CPU cycles to do a decent PWM on a matrix that big. I'm already worried about what the overall brightness will be like with 17:1 multiplexing.

I suppose you could limit yourself to having only a few different PWM brightness levels but is that really what you want?

Those WS2811 boards cost less than 30 cents each and would really make a difference to overall brightness and PWM effects. You could devote the CPU power to pattern generation and music analysis instead of just multiplexing.
2008  Using Arduino / LEDs and Multiplexing / Re: Problems with voltage using a few leds on: December 11, 2013, 06:09:48 am
Quote
Yes, you will destroy your LEDs/Arduino/power supply of you keep on doing that.

Sorry, but I donĀ“t understand how you took this conclusion.

You said the voltage is dropping on other pins.

Anything that causes voltage drop on other pins is doing something bad to the power supply.
2009  Using Arduino / Microcontrollers / Re: New "Arduino" to beat them all. on: December 11, 2013, 06:02:48 am
those that know X86 architecture and code will immediately see the advantages instead of just dismissing it out of hand simply because it's new.

I'm not saying it's useless, but is it really "Wow!!!"?

Maybe I could get excited if it had a VGA monitor connector or something...

2010  Using Arduino / General Electronics / Re: Gyroscope help on: December 11, 2013, 05:50:55 am
they say they need to be used with their shield. Would they still work without their shield and would we get accurate values?

Tinkerkit is just a way of connecting things to Arduinos. The connector just has 5V, GND and pin connection in a single plug.

You can easily connect it without the shield - cut the plug off and connect the three wires to 5V, GND plus an Arduino pin. It will work exactly the same.
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