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1006  Using Arduino / General Electronics / Re: Solder paste for stencils on: April 01, 2012, 12:32:46 am
That's not so bad, how much smd do you usually do on those boards?  Im wondering if its worth it to get a stencil on my next board, probably another 150 or so pads, and individually applying the paste gets a little boring and gets old fast
the board is a mega shield size so the pcb from batchpcb is like 22 $ plus the shipping and handling makes it close to 40$, is the extra 30 worth the cash?
1007  Using Arduino / General Electronics / Re: Solder paste for stencils on: March 31, 2012, 04:48:26 pm
I've got some solder paste from ebay, and Ive only used it twice, once for for like 35 0805 leds and 50 0805 resistors, and another with a few soic ics,
I cheaped out and just directly applied the solder paste on the pads with a modified syringe, just a little bit on each and it worked great
I tried two techniques for the soic, one I put paste on each individual pad and the other just a line across all the pads, both methods worked perfect, obviously the line was faster tho
its amazing how well solder paste works and it was much easier than I thought, the way the leds and resistors just pull themself in line not only looks good as a finished product but amazes me everytime as it moves by itself with just the surface tension
How much does it usually cost you guys for the stencils?
1008  Using Arduino / Microcontrollers / using the onboaurd 8/16u2 as isp? on: March 31, 2012, 04:36:18 pm
Is it possible to use the onboard 8u2 to isp the atmega328/2560?
I imagine all it would need is a nice jumper from the isp of it to the other, snipping the reset line in the jumper
the 8u2 can already reset the 328 like it does with the dtr line right? So why not it be used as a usb->serial/isp
then there would be no need for the bootloader right?
1009  Using Arduino / Installation & Troubleshooting / Re: AVRDude on: March 31, 2012, 04:23:27 pm
Any friends who use arduino? Have someone else try, sometimes the answer is so stupid and just sometying you looked over a hundred times, if someone else tries they have a new perspective and may find your mistake
1010  Using Arduino / General Electronics / Re: Op amp woes. on: March 31, 2012, 10:28:45 am
A dual supply opamp would do that, which the 602 is not
but unless your feeding it with -+ 2.5 volts I don't see how that's happening, how are you reading the output? I assume an oscilloscope? Make sure you connect the ground from the probe to your ground
1011  Using Arduino / Programming Questions / Re: Virtual wire problem on: March 31, 2012, 10:01:36 am
It would help to know what kind of rf module you are using, maybe with a datasheet link,
and what are you going to do with that data? It maybe a bit hard to do much with just two arduinos
1012  Using Arduino / Programming Questions / Re: theramin synth project, programming question(anolog offset) on: March 31, 2012, 09:58:03 am
Got a multimeter? It may help to get the actual values on the analog pins and compare to the one that works, just to make sure its not a hardware problem
1013  Using Arduino / Programming Questions / Re: using multiple pages in the ide on: March 31, 2012, 09:50:44 am
Got it working, I had to make each tab a function then just call it from the main page
Much neater now,  so 15pages instead of scrolling up and down looking for where they begin and end
1014  Using Arduino / Programming Questions / using multiple pages in the ide on: March 31, 2012, 08:46:44 am
What is the proper way to use multiple pages in the ide? I tried just pasting parts of my code there to neaten thing up but that doesn't work
basically I want to have one large if statement per tab, its for a touchscreen all the pages and menus I want to neaten the code up a bit
1015  Using Arduino / Programming Questions / Re: ascii code in arduino on: March 31, 2012, 12:18:20 am
That only works with non ebay cheapo who knows what kinda stuff, can't hurt as a one time exercise for a 2$ piece lol
1016  Using Arduino / General Electronics / Re: analog pin resistance? on: March 31, 2012, 12:15:54 am
So if I had a 10M source it would take 20 throw away calls to analogRead()?
1017  Using Arduino / Project Guidance / Re: Mega 2560 for project on: March 30, 2012, 06:06:50 pm
If you buy atmega2560 you will have to learn about bootloading and isp, I've soldered one tqfp chip before and its not so bad with the hot air method and solder paste, definetly needs a custom pcb tho,
1018  Using Arduino / General Electronics / Re: analog pin resistance? on: March 30, 2012, 04:05:58 pm
I usually discard once and read,
but if I do a 10M and a 2.2M resistor divider I can get an accurate reading without altering it
id try it but I don't want to buy the resistors if its not worth it
1019  Using Arduino / Programming Questions / Re: ascii code in arduino on: March 30, 2012, 02:22:14 pm
I figured it out with a simple program, have it cycle thru the characters printing the nu,ber below the actual character, then just use the number you found
1020  Using Arduino / Programming Questions / Re: OSEPP (ARDUINO COMPATIBLE) VS ARDUINO on: March 30, 2012, 02:20:21 pm
From what it sounds like its sketcky, I've bought 3 mega 30$ ea, 2 unos 20$ea, and a nano 15$ from ebay and never had a problem with any,
so far
unkown chinese dealer : 6
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