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31  Using Arduino / Microcontrollers / Re: Leonardo Clone out already! on: July 28, 2012, 11:55:34 pm
this is an extremely unlikely reason, but since Arduino ships with an older and custom compiled version of WinAVR, maybe it's too outdated for this chip?
32  Using Arduino / Microcontrollers / Re: Burning fuses for no bootloader on: July 16, 2012, 10:46:53 pm
I expected the BOOTSZ options to be 'greyed out' when BOOTRST is disabled; but it wasn't.

There is a good reason for that: Because everything is extracted from the XML, and nothing in the XML makes a relationship between BOOTSZ and BOOTRST. The code isn't as smart as a human who would make any relationship between the two.
33  Using Arduino / Displays / Re: 128x64 LCD Guide. Can't see the components in Picture. Please identify. on: July 14, 2012, 11:05:38 pm
looks like potentiometers, one for contrast adjustment, one for backlight brightness, I'd use a 10 kohm one for the first and a 1 khom for the second
34  Using Arduino / Microcontrollers / Re: Burning fuses for no bootloader on: July 14, 2012, 09:15:14 am
I am the author of one of those calculators http://frank.circleofcurrent.com/fusecalc/, those options are text extracted from a XML file provided by Atmel.

Given a set of BOOTSZ bits, my code matches it up with one of the strings from the XML file. Hence, it is not smart enough to say "0 sized bootloader" when BOOTRST is disabled because each possible combination of BOOTSZ bits matches to only one string.

Besides, BOOTSZ does not matter if BOOTRST is disabled.
35  Using Arduino / Microcontrollers / Re: Burning fuses for no bootloader on: July 13, 2012, 08:10:05 pm
the boot size bits do not have any effect if the boot reset vector bit is not enabled, so don't worry about it. that space is available for use if boot reset vector bit is disabled
36  Using Arduino / Storage / Re: 2 SD readers on Arduino? on: July 13, 2012, 07:55:22 pm
Can it be done with CS on pin 2 and other CS on pin 4 using the SPI

Yes
37  Using Arduino / Microcontrollers / Re: Is reset() hooked up to an event? on: July 12, 2012, 02:49:05 pm
Reset does NOT clear RAM.  The sketch startup code will clear ram, however.


If this is the case, then it is possible to implement a reset handler, but you're going to have to compile it into the very beginning of the bootloader, or stop using the bootloader.

It will be very difficult and most likely not worth the time in comparison to just implementing another button.
38  Using Arduino / Microcontrollers / Re: Is reset() hooked up to an event? on: July 12, 2012, 09:37:51 am
When you press the reset button, all RAM is cleared (correction from westf below, it is cleared because the compiler adds startup code before "main()", not because of hardware), all registers are default values, and your code jumps to the bootloader.

You can try placing code in the bootloader, but remember that all memory is reset.

You can get rid of the bootloader, but the memory is still reset.

You can store some stuff into EEPROM, that will not be reset.

The best way is to just add another button yourself.
39  Community / Exhibition / Gallery / Nehebkau, Laptop Controlled Keyboard and Mouse on: July 12, 2012, 09:15:28 am
For fun, I designed a little USB device, actually it has two USB devices on a small board in the shape of a stick. Two USB capable microcontrollers are on this circuit. One will connect to the Raspberry Pi, and behave like a keyboard and mouse. The other will connect to my laptop. My laptop will run software that captures keystrokes and mouse events. The laptop will tell the microcontroller what to do, so when I press a key on my laptop, the Raspberry Pi thinks the same key is pressed. (and the same with the mouse)

Video: http://youtu.be/iXMBKlIrzQs



More info, pictures, and downloads at http://frank-zhao.com/index.php?page=nehebkau
40  Using Arduino / Microcontrollers / Re: Standalone ATMega328 Crystal Selection on: July 04, 2012, 08:11:01 am
Do you absolutely need 16 MHz? You can skip both the crystal and resonator if you just ran on the internal 8 MHz resonator.

You don't need the 10 kilo-ohm resistor, there's an internal pull-up built into the ATmega already

Yes you do.
Even if you don't want your end deal to have the 16 MHz crystal and the 10K pull-up with it all the time, you do need them at one point.  Burning the bootloader.  Whether you are programming it to use the 8MHz internal clock, your arduino needs to have that external 16MHz crystal to burn the bootloader with.

No you don't, from factory, the RC oscillator is the default oscillator
41  Community / Bar Sport / Multirotor Lifts 47KG, See BeerLift 2012 Results! on: July 03, 2012, 11:40:06 am
Hey guys check these out, multirotor helicopters lifting heavy stuff, really impressive

http://www.hobbyking.com/hobbyking/store/beerlift.asp
42  Using Arduino / Project Guidance / Re: Two projects on: June 30, 2012, 09:19:26 pm
The Arduino should be able to do all of these things, both projects

Plus, your phone can do any sort of heavy processing that you might want, it's probably more powerful than the Raspberry Pi
43  Using Arduino / Microcontrollers / Re: Standalone ATMega328 Crystal Selection on: June 29, 2012, 11:16:45 pm
here's the math formula for the capacitor calculation you asked for earlier



it's from this page

http://www.oscilent.com/spec_pages/PNDescrpt/Load_Cap.htm
44  Using Arduino / Microcontrollers / Re: Standalone ATMega328 Crystal Selection on: June 29, 2012, 12:36:47 pm
Do you absolutely need 16 MHz? You can skip both the crystal and resonator if you just ran on the internal 8 MHz resonator.

You don't need the 10 kilo-ohm resistor, there's an internal pull-up built into the ATmega already
45  Using Arduino / Motors, Mechanics, and Power / Re: Arduino Based ESC on: June 18, 2012, 12:38:23 pm
http://www.mikrokopter.de/ucwiki/en/BL-Ctrl_Manual

Maybe add bigger MOSFETs to achieve 100A?
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