Very nice looking board, I like it. Still, hard to made. Some traces can be manually repositioned to have a little more space between them. If is about 8mills traces-space then better to have them in a less number - a reduced number of fabrication errors ... Anyway, I like it (good to have two rows of connectors - can be combined with male-female ones).
Vasi On Feb 4, 11:59 am, Sebastien Lelong <[email protected]> wrote: > Hi guys, > > So...I'm back, after several tries. > > It was possible to keep most features, specifically providing 2 voltages, 5V > and 3.3V. This was quite a mess though, mostly Xbee requires 3.3V, and > possibly voltage shifter on inputs (datasheet says it's not 5V tolerant, but > some report it is in reality). So I removed 5V regulation, and kept only > 3.3V, making this board more 3.3V devices friendly. If Xbee isn't wanted, > then one would just put an AMS1117-5V instead of 3.3V version. > > I worked again on power supply inputs. There can be 4 sources: USB (5V > regulated to 3.3V), external (5-9V regulated to 3.3V), serial (no regulation > so must output 3.3V, quite rare), and battery (direct, no regulation). I put > a fuse after the regulation part. > > Since I had some room left, I added a microSD slot, though I still wonder > how I'll solder it... :) It's on the bottom side. If replacing 3.3V > regulator with a 5V one, again SD-card won't work. > > I doubled shield/breadboard connectors to allow breadboard + shields at the > same time. User could also solder some wires to plug the board to external > daughter, using external connectors/holes. Shields can also be on top or > bottom, both, etc... > > I may also add another pin header which would include supplied voltage, > making it available to shields/breadboard (voltage coming from USB, > external, ...). > > Anyway here's the result, see attached files: schematic, PCB, PCB top, PCB > bottom (some comments are wrong, sorry). > > Feedback appreciated. Highly ! > > Cheers, > Seb > > 2011/1/30 vasile surducan <[email protected]> > > > > > > > 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]<jallib%[email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/jallib?hl=en. > > -- > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org > > jaluino_v04_bee_schematic.png > 75KViewDownload > > jaluino_v04_bee_pcb.png > 43KViewDownload > > jaluino_v04_bee_pcb_top.png > 33KViewDownload > > jaluino_v04_bee_pcb_bottom.png > 24KViewDownload -- 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.
