Vasile, I can understand your concerns about using breadboards, but I think you missed the "big picture". The board is, as Vasi put it, "for rapid prototyping". I don't think it is intended to be used in a final product where such concerns would be an issue. Its much much more time consuming/expensive to prototype a pcb only to find later that you need to make a change. With a breadboard it's normally just a matter of swapping a couple jumpers around. I think the board is a pretty good idea.
-Brian E. On Oct 30, 10:17 am, vasile surducan <[email protected]> wrote: > It looks good (haven't patience to look closer). However why did you mix > through hole with smd? (except the connectors, use only smd onboard) The > lenght can be reduced with at least 10-15mm if miniaturization is your need. > All vias are below the microcontroller, some people does not recommend such > tehnique, however I see no problem only if this board is factory > manufactured. Maybe the board has a good purpose, which I can't see it > because I have never used solderless breadboards and have no intention to > use from now. > > Using a breadboard: > - is not safe, has poor contacts, a lot of signal interferences, the final > stuff breadboarded can work different than the prototype (if the breadboard > user will manufacture a prototype after playing with wires) and that is a > good way of wasting time understanding if the bug is a software or a > hardware one > - the user is missing the key of playing hardware: learning soldering > tehniques, learning PCB design techniques, understanding the bitter relation > between the initial ideea and the final product > > Vasile > > On Sat, Oct 30, 2010 at 6:17 AM, vasi vasi <[email protected]> wrote: > > Hi guys, > > > I want to present you the smallest member of Jaluino, Jaluino CELL as > > it was named by Sebastien. Look at it as a prototype and a proposal. > > The board is designed to be used on a breadboard and for rapid > > prototyping. > > > This version use the USB bootloader of Albert and use the red LED as > > boot mode indicator. Right now the red LED is connected at RA4 pin but > > I'm open to suggestions. Unfortunately, the space is very small and I > > was forced to remove the jumper which allowed disconnection of the > > LED. You can do that removing the limiting resistor (but is nice to > > have a boot mode indicator). Also not all components fits on the top. > > One diode and three resistors (all smd) are soldered on the bottom. > > The green LED is for power indicator and the blue jumper is for power > > select (USB or external). The external power must be 5V regulated. > > Why no regulator on board? To be able to address any project, > > with any consumption requirements. > > > The board don't have an ICSP connector (no more space) but having > > external pins, the microcontroller can be easily programmed if you > > insert the board on a breadboard (without the fear of bending pins). > > > Well, the initial version was a lot bigger but Sebastien suggested that > > if can be of maximum 5cm long it can benefit from the cheapest > > Seeedstudio service and I considered it a good advice.. > > > I hope that this board will be useful for someone. > > > -- > > Vasi > > > -- > > 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.
