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Re: [Gumstix-users] Newbie: Power and serial
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From: vwyodapink <vwy...@gm...> - 2010-06-22 22:08:01
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Would anyone happen to know an easy way to use a 2s lipo and a 3s lipo with the same combo fire/summit ? Michael Ewald-2 wrote: > > Thank you for getting back to me. I got the voltages mixed up on the > battery. I'm set! I can't wait to play with this thing! > > Thanks, > Michael Ewald > > On Jun 22, 2010, at 2:34 PM, Joshua Brown <ian...@gm...> wrote: > >> >> Overo does 3.3 to 4.2 volts very well. It was designed with the >> Lithium >> chemistry batteries in mind, just like a cell phone or mp3 player. >> You are >> using a LiPo battery which should never ever go above 4.2 volts or >> dip below >> 3.4 volts. Won't you just use that? Why 2.7 volts? >> You mentioned "barrel connector" so I'm assuming you are using an >> expansion >> board. If you are using the Summit or Tobi boards the pin 40 on the >> through >> hole connector is the same as + on the barrel connector. See >> http://www.gumstix.net/Hardware/view/I/O-connectors-cabling/Gumstix-Summit-board-40-pin-header-SV1/112.html >> . >> The overo gumstix has two teeny 70pin hirose connectors. Each of >> them has >> access to ground and the 3.3 to 4.2 volt supply. See >> http://www.gumstix.net/Hardware/view/I/O-connectors-cabling/Gumstix-Overo-70-pin-connector-J4-features-Extended-Memory-Bus-and-MMC-signals/112.html >> If you are using the expansion boards you have a nice access to >> Overo's RXD3 >> and TXD3 on pins 21,22 and RXD1 and TXD1 9,10. They are 1.8 volt >> logic >> levels so you must use a level shifter. >> >> "1: can the overo accept voltages at 2.7v or do i need to step it up? >> 2: is there a battery / power input other than the barrel Jack >> 3: how do I go from ttl serial to a format I can use on the overoin >> the >> cleanest way possible?" >> >> >> --- >> --- >> --- >> --------------------------------------------------------------------- >> ThinkGeek and WIRED's GeekDad team up for the Ultimate >> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the >> lucky parental unit. See the prize list and enter to win: >> http://p.sf.net/sfu/thinkgeek-promo >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users >> >> >> >> -- >> View this message in context: >> http://old.nabble.com/Newbie%3A-Power-and-serial-tp28964504p28965336.html >> Sent from the Gumstix mailing list archive at Nabble.com. >> >> >> --- >> --- >> --- >> --------------------------------------------------------------------- >> ThinkGeek and WIRED's GeekDad team up for the Ultimate >> GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the >> lucky parental unit. See the prize list and enter to win: >> http://p.sf.net/sfu/thinkgeek-promo >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ----- Just a beginner trying to learn his way around. -- View this message in context: http://old.nabble.com/Newbie%3A-Power-and-serial-tp28964504p28965664.html Sent from the Gumstix mailing list archive at Nabble.com. |