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1  Forum 2005-2010 (read only) / Troubleshooting / Re: Windows Vista fails to install driver for UNO on: January 19, 2011, 03:11:00 am
I actually had trouble too in Vista... I gave up and when I installed windows 7 it worked great!
2  Forum 2005-2010 (read only) / Development / Re: Atmega328 powered by a 3.7 volt battery? on: January 21, 2011, 03:21:59 am
Mann.. there HAS to be an easier way? So I cant just use the external oscillator and the chip with an unregulated battery source??

those batteries charge to 4.2 volts and drain to 2.75

I'm so confused. I just know i need the smallest and lightest weight battery possible and this is discouraging :/
3  Forum 2005-2010 (read only) / Development / Re: Atmega328 powered by a 3.7 volt battery? on: January 21, 2011, 02:27:28 am
Code:
No.  But the answer to the next question has to be "yes"...

Do you have a way to change the fuses?

I honestly have no idea what you are telling me? Could you restate it? I'm new to all this. I feel like your information is valuable and I don't want to miss it.


Do I need to use anything more than just the naked atmega328 chip?

I'd really like to use just the chip from my arduino uno rather than the pro mini. is this possible?
4  Forum 2005-2010 (read only) / Development / Re: Atmega328 powered by a 3.7 volt battery? on: January 21, 2011, 01:42:29 am
How do I know if I need it to run at 16Mhz? I'm going to be writing code similar to this: http://fritzing.org/projects/arduino-knight-rider-with-8-blue-12v-led-modules/


Do I even need an oscillator? I just know I'm going to make a persistence of vision display (POV).

will I need 16Mhz for this?
5  Forum 2005-2010 (read only) / Development / Atmega328 powered by a 3.7 volt battery? on: January 20, 2011, 10:30:39 pm
Can an Atmega328 +oscillator run off of 3.7 volts without a regulator to be used for 7 channel pulse width modulation with mosfets to drive the leds?

I'm desiring to power it with an 18650 battery. (which charges to 4.2 volts and drains to 2.75 volts)

http://www.dealextreme.com/details.dx/sku.5790
6  Forum 2005-2010 (read only) / Development / Re: Voltage regulator needed? Or not? Portable LED PWM on: January 19, 2011, 06:16:58 pm
so do you guys think a 3.7 volt battery is enough to power both the arduino using PWM on 6 pins AND the leds through the mosfets WITHOUT a regulator?
Or should I use 2 batteries and power it with a regulator? should i use the 3.0 or 3.7 volt batteries.
7  Forum 2005-2010 (read only) / Development / Re: Voltage regulator needed? Or not? Portable LED PWM on: January 19, 2011, 05:08:17 am
Thanks for mentioning the resistor, Yes I will take this into account.

I'm needing a lighter weight and smaller size so I don't think AA's will work. And I don't see any advantages of using AAA's over the cells I mentioned? Do you know how I could do this with the cells I mentioned? I believe that my form factor will be best when using these cells? I'm just not sure exactly what combination. (one or two) and (cr123A's or 18650's) and (series or parallel). Do you know how I would address this issue?


also I found this battery. would 1 of these be able to power my system?http://www.dealextreme.com/details.dx/sku.5035#open full view
8  Forum 2005-2010 (read only) / Development / Voltage regulator needed? Or not? Portable LED PWM on: January 19, 2011, 03:11:19 am
I need advice for which batteries to use (and if I will then need a voltage regulator or not.) This project is extremely important to me. (Its my first big electronics project ever. I'd really appreciate the assistance.

I'm building an ATmega328 powered LED PWM circuit with 6 PWM channels.

I have to build this device as small as possible, but to run as bright as possible for as close to an hour as I can get (or higher)

I basically have the same setup as http://fritzing.org/projects/arduino-knight-rider-with-8-blue-12v-led-modules/ except I'm only using 6 Leds (or 12 (2 per channel)) and my leds are different. I'm looking at using these leds:http://www.sparkfun.com/categories/173 Which run at 60-75ma) with a forward voltage of 3.0-3.4 volts. Obviously I will not use the 12 source like in the link. I need to figure out my own source.

I need to use rechargeable batteries, so I've narrowed it down to dealextreme.com's 3.7 volt or 3.0 volt CR123A's or the 3.7 18650. (I want it to be as small as possible, but still have near an hour of battery life.)


I'm really desiring a consistent accurate PWM in my circuit, but I don't know what do do about the batteries and voltage regulator...
Should I use 1 CR123A? 2 CR123A's in series? in parallel? 3.0volt? 3.7volt?
Or should I use the 18650 3.7 volt battery? or 2? series/parallel?

then based on my battery choice will I need a voltage regulator? which one?

Also should I be powering 6 leds? or 12 (6 sets of 2 in series)?


Thanks for reading this!
If you need more information I will gladly respond quickly!
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