On Sat, Oct 30, 2010 at 5:30 PM, mattschinkel <[email protected]>wrote:
> This Jaluino CELL looks nice. I agree that vias can't be under the SMD > PIC. As for the capacitors etc, I don't mind if they are through hole > components since SMD's are harder for beginners to get. > > If you want, there could be two versions of this, one with all SMD > (and vias under SMD), and one with only PIC SMD (make the resistors > stand up). Vasile is right, don't mix. > > So, where is Jaluino MAX? May I suggest 18f67j50 or 18f87j50. > > I think all beginners use a breadboard. Are you saying that you did > not? I have never used solderless breadboards. And I will never use. Of course I have used 100mil pre-drilled breadboards, in which routes are connected with soldered (or rolled) wire-wrapping. I will search some pictures of old projects from that era, just see how looks 300 to 500 wired routes...If someone did such thing once, will never do it again, it's the best way of learning...from mistakes. [?] > Bread-boarding is a good cheap way to learn electronics. I > personally don't have the cash to mess up PCB's and components, so I > make stuff on breadboard first, but I have to be careful to modify my > schematic every time I move something. Of course I'm sure micro- > controllers and cell phone's can't be designed on a breadboard. It > depends what are building. In this case, it is a learning tool. > > Matt. > > 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]> > <jallib%[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. > > -- 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.
<<338.gif>>
