On Sat, Jan 29, 2011 at 10:49 AM, funlw65(Vasi) <[email protected]> wrote:
> I think you will need to design two boards. One supporting USB uCs and > second for serial uCs. Keep 1206 smd components, otherwise you must > provide the board assembled. And this is because of 5x5mm limit. > Try > to see how many features you can put on a single type of board. > all you need... > > Vasile > > On Jan 29, 6:03 am, Sebastien Lelong <[email protected]> > wrote: > > Hi guys, > > > > Here's my last version, including a 500mA fuse (not resettable, but I > only > > have this one in my eagle lib), a rectifier diode for reverse polarity > > protection, onboard LED moved to RC2 (CCP1 pin). Some remaining "doubts": > > > > - which package would I need for the diode: DO-214AA, DO-214-AB or > > DO-214AC ? > > > > - I still have doubts about the power supply part. Initially, I wanted > to > > have power through USB or a battery. The board should handle 3.3V and 5V, > as > > an option. When using a battery, say 2 x 1.5V AAA cells, I'd need to > bypass > > all regulation (maybe even a pump like this: > http://www.sparkfun.com/products/9216). Using a rectifier diode will also > > drop the voltage down and may not be compatible. But I could also use a > 9V > > battery, and thus need 5V and/or 3.3V regulators... and what if 3.3V is > > bypassed, but not the 5V regulator ? Xbee board will be powered with 5V, > > instead of 3.3V!!! You guessed it, I want many things and I'm not sure > which > > is most important at this phase. Any input, advices ? I think when I'll > > start to create the PCB choices will be easier to make as I discard > options > > to gain room :) > > > > - I added pin headers, 2 x 14 pins, I may add another one dedicated to > > power pins (like in Medium) if I get enough room (I doubt about it) > > > > In order to save some precious room, I'm thinking of (high priority to > low): > > > > - removing Reset-via-RTS option and make it always available (2-way > jumper > > saved) > > - remove two I²C jumpers, always make the board acting as a master, and > if > > not wanted, just don't solder the resistors > > - remove CTS jumper option (not used often ?) > > - remove power from serial module option, focusing on USB or battery > > - keep only one regulator, adding an optional resistor to match > required > > 3.3V for Xbee when using 5V reg only. > > - move to 0603 smd components..... > > > > Any feedback highly appreciated! > > > > TIA > > Cheers, > > Seb > > > > 2011/1/25 mattschinkel <[email protected]> > > > > > > Maybe I should just use two different voltage regulator, one > AMS1117/5V > > > and > > > > AMS1117/3V3. Having only one component would have helped while > sourcing > > > > them. > > > > > On one prototype board I bought, there is only a AMS1117/3V3. They > > > assume you want to input > 5v and get 3v output. If you want another > > > voltage you can put a jumper (just solder) to connect the input/output > > > of the regulator so your voltage is whatever the input is. > > > > > Matt. > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "jallib" group. > > > To post to this group, send email to [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<jallib%[email protected]> > <jallib%[email protected]<jallib%[email protected]> > > > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/jallib?hl=en. > > > > > > > > jaluino_v03_bee_schematic.png > > 62KViewDownload > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<jallib%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > > -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
