From: RussellMorin <rm...@wp...> - 2008-11-14 17:08:55
|
Mark, Currently I just have battery power going into the L7805 and the regulated power coming out. I don't know enough electrical engineering to have tried adding caps. I hooked a DVM up to the leads and noticed that the voltage starts to drop off from 5.02 Volts down to 4.83 and dropping. How should I configure my circuit to stop this from happening? Thanks, -Russell m_ahlenius wrote: > > Russell, > > out of curiousity, do you have a decent sized cap as well as a small > decoupling cap on the output of the L7805? You might put scope or DVM > on the power output and see if you can detect a dip in voltage. I do > recall that the Wifi does suck down some power. > > best, > > 'mark > > RussellMorin wrote: >> Dave, >> >> I am having a similar resetting problem. I have a >> Connex200xm/Robostix/Wifistix setup running Buildroot 1629. It runs >> perfectly fine on a Gumstix power supply, but I'm trying to disconnect my >> robot from the wall. I'm getting power to the stack through a L7805CV >> regulator to give it 5V and up to 1.5 amps. Since the wall wart for the >> Gumstix is rated for 5V at 1 amp this should be fine. >> >> Right about when the Wifistix starts to kick in the stack reboots and >> goes >> into an infinite reset loop. Are there any mods besides the pullup >> resistor >> mod that I could do to make this work? >> >> Thanks, >> -Russ Morin >> >> Dave Hylands wrote: >> >>> Hi Jostein, >>> >>> >>>> I received my Gumstix and Robostix two weeks ago for my project this >>>> fall >>>> at >>>> the Norwegian University for Science and Technology (NTNU). The first >>>> thing >>>> I noticed was the weird dents on top of one of the chips on the Verdex >>>> XL6P. >>>> I don't know if they are normal, so I've attached an image of it. >>>> >>> I think I see the dent that you're talking about. It really depends on >>> how it was created. >>> >>> >>>> The other >>>> image shows how I've connected the Verdex to my computer. The Verdex is >>>> plugged into the Robostix, and the Verdex FFUART available from the >>>> Robostix >>>> is connected to my Atmel STK500 - which also powers the board with +5V. >>>> The >>>> STK500 contains a level converter and RS232 out which lets me connect >>>> it >>>> to >>>> my computer. >>>> Using kermit I can connect to the Verdex, and at first it seems ok, but >>>> then >>>> it starts resetting. >>>> >>> That's not good. If you have a Wifi chip, then the resetting is >>> normal. If you don't, then I would be inclined to return the gumstix >>> for RMA. >>> >>> -- >>> Dave Hylands >>> Shuswap, BC, Canada >>> http://www.DaveHylands.com/ >>> >>> ------------------------------------------------------------------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> challenge >>> Build the coolest Linux based applications with Moblin SDK & win great >>> prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the >>> world >>> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> _______________________________________________ >>> gumstix-users mailing list >>> gum...@li... >>> https://lists.sourceforge.net/lists/listinfo/gumstix-users >>> >>> >>> >> >> > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the > world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- View this message in context: http://www.nabble.com/My-Gumstix-keeps-resetting-tp19638258p20504613.html Sent from the Gumstix mailing list archive at Nabble.com. |