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.
