Hi Sebastien, I looked again on Arduino site at their hardware specifications starting from Nano, Diecimila to Duemilanove and Mega. All boards are using the 5V source for powering the microcontroller and the board. If an external source is lower than 7V can cause board instability. The 3.3V power is provided by FTDI and can draw a maximum of 50mA. Is provided for shield and is fragile in my opinion. Jaluino can have a more powerful regulator. Having a 3.3V source available for shield is a good option (very handy).
But, if others can't easily find a 3.3V voltage regulator, the board still can be built and used because 3.3V is only for shield use (if required - it can be soldered later). Anybody can find a 7805 5V regulator. My opinion... Regards, Vasi On Aug 31, 10:13 pm, Sebastien Lelong <[email protected]> wrote: > Hi Richard, > > I can't guess which is the most used, which make more sens: > > 1. 3.3V/5V selection for board and shield, or > 2. 5V on board and 3.3V shield with voltage adjustments... > > If we follow Arduino design, I think (but I'm not sure it is the same on all > *duino flavors) it corresponds to just 3.3V on spare pin, that is option 2. > > > > > > OK, I'll try to find one of these. > > > I've ordered more copper clad boards & more stuff on eBay, I hope to > receive > > > them this week so I can build this upcoming board next WE. > > > Lets hope the next one will be the final one for Jaluino Medium > > homebrew > > Don't worry for me about building many boards, I expected this, and this is > a mandatory and very important step. (and I need to see it for real to > figure out what should be modified, etc...) > > Cheers, > Seb > -- > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org > > 2009/8/31 Richard <[email protected]> > > > > > Hello Seb, > > > > > Ok, I will only add 3.3V to spare pin of the power connector, but am > > > > afraid i will at least need to add 1 via and maybe more :-(. > > > > Do you mean it would be simpler if you put 3.3V selection and all the > > > whistles about 3.3V ?... :) > > > Well, it is quit simple to make +5V selectable between 3.3V and 5V > > because the traces don’t need to be changed so except for serial > > connector (this better stay on 5V) all +5V when selected on 3.3V will > > become 3.3V so on power connector that +5V will also become 3.3V > > (spare stays unconnected). > > > above is easier but if you want the main board on 5V and need only > > 3.3V for the shield (and off course dealing with the voltage level > > adjustments on the shield) this would be impossible. > > > But every time when you need 3.3V on a shield you also want to power > > your main board with 3.3V so that you don’t have to deal with voltage > > level adjustments, well than it is the easiest way. > > > In my opinion is 3.3V on the spare pin of the power connector AND 5V > > selectable between 3.3V and 5V the most flexible option (but off > > course also the most impact on the pcb) > > > > OK, I'll try to find one of these. > > > I've ordered more copper clad boards & more stuff on eBay, I hope to > > receive > > > them this week so I can build this upcoming board next WE. > > > Lets hope the next one will be the final one for Jaluino Medium > > homebrew > > > > Cheers, > > > Seb > > > Greetz > > > Richard --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
