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916  Using Arduino / Microcontrollers / Re: what is the recommended isp for general use? (328 and 2560) on: April 12, 2012, 10:09:35 pm
Even if its a small sketch it wouldn't work? Where does the 128kbs size apply to?
917  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 10:08:00 pm
Definetly, im looking into a very mobile project where number of components makes things alot harder, and caps and a crystal would be nearly impossible, and 5v isn't an option, need direct from a lipo
 so happy how millis still works the same, that makes my life that much easier
again thanks that made my first voyage under 5v so much quicker, would've taken me a while to spot the divide by 8 thing
918  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 08:04:27 pm
Awesome it was the divide by 8, fixed it and uploaded bootloader and immediatly noticed proper blinking rate at the start
Uploaded blink with the ide(which uses 57600 whe. Pro mini 3.3v is selected)
success! Than you very much for the perfect advice
919  Using Arduino / Microcontrollers / Re: full 23 i/o pins on atmega328 on: April 12, 2012, 07:53:37 pm
I think those are for the smd version which has 2 extra analog pins
920  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 07:29:15 pm
Ill try the 57600 when I get home in a few, here's my fuses
Code:

avrdude -p m328 -c usbasp -U lfuse:w:0x62:m -U hfuse:w:0xd7:m
Delay(1000) seemed so long so I figured if I put it at 250 it'd come out to 500 but it seems to be 1000
millis() runs on a timer which is provided by the clock right? so millis should be 1/2 fast which would be easy to adjust in my programs because I have alot of timed stuff, but if its not 1/2 and some other number it'll be a bit annoying
im uploading the compiled blink sketch with the usbasp since the optiboot isn't working, I tried selecting pro mini and burn bootloader with the ide but it just blinks afterwards and doesn't respong, could be the timing again
If my atmega328 happens to be one of those at the end of +/- 10% off is there a baud rate that will accept that error? Is there a way I can adjust the calibration without a different programmer
921  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 07:06:50 pm
I changed the fuses to 8Mhz and uploaded that bootloader however the ide isn't talking to it... the board just doesn't respond
checking my fuses, I just did what the fuse calculator on the atmel page said for 8Mhz int osc reset enabled,  serial programming enabled
what can it be?
and btw how much slower does 8Mhz make millis? I have delay(250) and its like 16'hz delay(1000)
922  Using Arduino / Microcontrollers / full 23 i/o pins on atmega328 on: April 12, 2012, 05:55:54 pm
This is a question of curiousity
I know there are a total 23 I/o on the atmega328
20 are normally accessible to an arduino board, but on a breadboard what would it take to access the others? I know 1 is the reset and is not a good idea due to the high voltage reset needed afterwards,
the other two I guess are the xtal? If its running 8Mhz internal oscillator are those pins free to be I/o? How would I access those without direct port manipulation? Does the ide support it?
923  Using Arduino / General Electronics / Re: SMT oops on: April 12, 2012, 05:42:53 pm
Id suggest 30 gauge stranded wire,  it'll be a pain and how are you gonna mount that now?
924  Using Arduino / General Electronics / Re: Using a car battery to run Arduino for about six thousand years, need to design on: April 12, 2012, 05:28:04 pm
Why not just use a lm317 as a constant current source? I made myself a charger for my 12v 4.5a batteries, set for 13.5v,add a heatsink and let it go,
925  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 05:16:01 pm
Awesome! Thank you, that saves me alot of time as im still just getting the hang of compiling and that whole process
926  Community / Bar Sport / Re: SMDs and 4-layer PCBs on: April 12, 2012, 01:19:45 pm
Wow, what could that be used for? I imagine a single board must cost thousands
927  Using Arduino / Programming Questions / Re: Delay using nop help on: April 12, 2012, 01:16:51 pm
If you use the timers it'll be like pwm, working in the background with the hardware leaving the loop for your code
928  Using Arduino / Microcontrollers / Re: requirements and limits of 8Mhz 3.3v on: April 12, 2012, 12:32:18 pm
Would the sparkfun 8Mhz pro mini bootloader work?
929  Using Arduino / Programming Questions / Re: Delay using nop help on: April 12, 2012, 10:56:30 am
Maybe you should be using the timers instead?
930  Using Arduino / Project Guidance / Re: Measuring UV index as part of a weather project on: April 12, 2012, 10:49:20 am
Perhaps a uv led can act as a sensor? It wont work with any wavelength bigger than uv so u can be sure its uv, but also you wont know if its uva or what
but at 5$ for a 1w uv led its pretty cheap
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