From: leith <el...@st...> - 2006-05-24 23:39:16
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i am only using the robostix for quick access to the i2c bus. however, if i connect all three boards, my wifi never loads and it seems gumstix doesn't boot (since wifi starts on bootup). if i unplug the robostix, bootup, then plug back the robostix, all works well. the problem, is i want to tie all three boards together so they aren't loose, and don't come apart. I can't do this as i need to unplug/replug the robostix with every reboot. suggestions? -leith ps. could this related to the tweener mod in anyway? |
From: Dave H. <dhy...@gm...> - 2006-05-24 23:55:55
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Hi Leith, On 5/24/06, leith <el...@st...> wrote: > i am only using the robostix for quick access to the i2c bus. however, > if i connect all three boards, my wifi never loads and it seems gumstix > doesn't boot (since wifi starts on bootup). > > if i unplug the robostix, bootup, then plug back the robostix, all works > well. > > the problem, is i want to tie all three boards together so they aren't > loose, and don't come apart. I can't do this as i need to unplug/replug > the robostix with every reboot. > > suggestions? It's most likely a power issue. The robostix voltage regulator only gives 500ma to the gumstix/wifi card, which is often not enough. Try plugging in the robostix with and cfstix both with +5v supplies. --=20 Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: leith <el...@st...> - 2006-05-30 23:06:19
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when i plug in 5V into the robostix, i do see the power LEDs on the gumstix, netCF and the robostix, but once again the OS fails to boot up (i can tell because my wifi LED never turns on, nor do my ethernet LEds blink). not sure what to try next. for now, i am forced to unplug the robostix, power up the netcf+gumstix, wait for the OS to boot up, and then plug in the robostix. this prevents me however from binding all three boards together for sturdiness. -leith Dave Hylands wrote: > Hi Leith, > > On 5/24/06, leith <el...@st...> wrote: >> i am only using the robostix for quick access to the i2c bus. however, >> if i connect all three boards, my wifi never loads and it seems gumstix >> doesn't boot (since wifi starts on bootup). >> >> if i unplug the robostix, bootup, then plug back the robostix, all works >> well. >> >> the problem, is i want to tie all three boards together so they aren't >> loose, and don't come apart. I can't do this as i need to unplug/replug >> the robostix with every reboot. >> >> suggestions? > > It's most likely a power issue. The robostix voltage regulator only > gives 500ma to the gumstix/wifi card, which is often not enough. > > Try plugging in the robostix with and cfstix both with +5v supplies. > |
From: Dave H. <dhy...@gm...> - 2006-05-30 23:36:38
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Hi Leigh, On 5/30/06, leith <el...@st...> wrote: > when i plug in 5V into the robostix, i do see the power LEDs on the > gumstix, netCF and the robostix, but once again the OS fails to boot up > (i can tell because my wifi LED never turns on, nor do my ethernet LEds > blink). > > not sure what to try next. If you don't have anything plugged into the gumstix port on the robostix, then add a 10k resistor between pins 3 and 4 on the gumstix connector. If you're careful you can permanently install this on the bottom of the board (It won't affect anything when a real level converter is plugged in). What's probably happening is that it's dropping into u-boot at boot time. The pullup resistor will make u-boot not detect any serial behaviour. Plugging in the gumstix to a robostix with power applied is not a good thing to be doing. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: leith <el...@st...> - 2006-05-31 20:38:59
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dave, thanks for the advice. I have installed a 10k resistor on the bottom of the board, but i still get the same results. are there other scenarios that would cause u-boot to come up? -leith Dave Hylands wrote: > Hi Leigh, > > On 5/30/06, leith <el...@st...> wrote: >> when i plug in 5V into the robostix, i do see the power LEDs on the >> gumstix, netCF and the robostix, but once again the OS fails to boot up >> (i can tell because my wifi LED never turns on, nor do my ethernet LEds >> blink). >> >> not sure what to try next. > > If you don't have anything plugged into the gumstix port on the > robostix, then add a 10k resistor between pins 3 and 4 on the gumstix > connector. If you're careful you can permanently install this on the > bottom of the board (It won't affect anything when a real level > converter is plugged in). > > What's probably happening is that it's dropping into u-boot at boot > time. The pullup resistor will make u-boot not detect any serial > behaviour. > > Plugging in the gumstix to a robostix with power applied is not a good > thing to be doing. > |
From: Dave H. <dhy...@gm...> - 2006-05-31 20:47:19
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Hi Leith, On 5/31/06, leith <el...@st...> wrote: > dave, thanks for the advice. > > I have installed a 10k resistor on the bottom of the board, but i still > get the same results. are there other scenarios that would cause u-boot > to come up? Not that I'm aware of. Do you have a tweener? Or an RS-232 level converter? That would be the best way to see what might be happening. And, you're sure you got the right pins? (cause they might be backwards when you flip the board over (depends on which way you flip it). I've done this myself several times... -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: leith <el...@st...> - 2006-05-31 20:51:29
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i have a tweener. i have just been avoiding the 'tweener mod' (since i want to see gumstix bootup w/ robostix), but i guess that is my best bet right now. yeah, i checked the pins, i am pretty sure i got it right. thanks for the quick response. -leith Dave Hylands wrote: > Hi Leith, > > On 5/31/06, leith <el...@st...> wrote: >> dave, thanks for the advice. >> >> I have installed a 10k resistor on the bottom of the board, but i still >> get the same results. are there other scenarios that would cause u-boot >> to come up? > > Not that I'm aware of. > > Do you have a tweener? Or an RS-232 level converter? That would be the > best way to see what might be happening. > > And, you're sure you got the right pins? (cause they might be > backwards when you flip the board over (depends on which way you flip > it). I've done this myself several times... > |
From: Dave H. <dhy...@gm...> - 2006-05-31 21:07:30
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Hi Leith, On 5/31/06, leith <el...@st...> wrote: > i have a tweener. > > i have just been avoiding the 'tweener mod' (since i want to see gumstix > bootup w/ robostix), but i guess that is my best bet right now. > > yeah, i checked the pins, i am pretty sure i got it right. > > thanks for the quick response. Are you powering the robostix? Or applying power on the wifi card? Because if you're not powering the robostix then you may get the behaviour you're seeing. The robostix has it's own voltage regulators which won't be powered if you plug in the power adapter to the wifi card. In fact, if you're using a wifi card, you may need to power both the robostix and the wifi card (becausemany wifi/gumstix combos draw more than the 500ma that the robostix voltage regulator can deliver). -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: leith <el...@st...> - 2006-05-31 21:15:32
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i am applying power to the robostix. (i do also see green lights on the netcf board) how would i supply power to both the robostix and the netcf if i am trying to build a battery? I chose to power the robostix because it was easy to add pins to the robostix on the 'board' holes to supply power. thanks again, -leith Dave Hylands wrote: > Hi Leith, > > On 5/31/06, leith <el...@st...> wrote: >> i have a tweener. >> >> i have just been avoiding the 'tweener mod' (since i want to see gumstix >> bootup w/ robostix), but i guess that is my best bet right now. >> >> yeah, i checked the pins, i am pretty sure i got it right. >> >> thanks for the quick response. > > Are you powering the robostix? Or applying power on the wifi card? > Because if you're not powering the robostix then you may get the > behaviour you're seeing. The robostix has it's own voltage regulators > which won't be powered if you plug in the power adapter to the wifi > card. > > In fact, if you're using a wifi card, you may need to power both the > robostix and the wifi card (becausemany wifi/gumstix combos draw more > than the 500ma that the robostix voltage regulator can deliver). > |
From: Dave H. <dhy...@gm...> - 2006-05-31 21:54:57
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Hi Leith On 5/31/06, leith <el...@st...> wrote: > success! > > here is what works for me: > > 1. resistor between gumstix connect 3 and 4 on robostix > 2. put power supply into netCF instead of robostix So your gumstix boots, but your robostix won't be working properly if you don't power it (even though it may appear to work kind of, you'll get weird problems, as others have discovered). You'll need to power both. You can buy the jacks at DigiKey. If you're powering from a battery, you'll need to put a voltage regulator on the power going into the netCF. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |
From: Demetris Z. <fgc...@cy...> - 2006-05-31 20:48:19
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I'm designing a breakeout board for the LCD and i kinda got stuck on the connectors. What type of connectors match to the Flex cables on the LCD? Demetris |
From: leith <el...@st...> - 2006-05-31 21:34:14
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success! here is what works for me: 1. resistor between gumstix connect 3 and 4 on robostix 2. put power supply into netCF instead of robostix thanks for all the guidance, dave! -leith leith wrote: > i am applying power to the robostix. (i do also see green lights on the > netcf board) > > how would i supply power to both the robostix and the netcf if i am > trying to build a battery? I chose to power the robostix because it was > easy to add pins to the robostix on the 'board' holes to supply power. > > thanks again, > > -leith > > > Dave Hylands wrote: >> Hi Leith, >> >> On 5/31/06, leith <el...@st...> wrote: >>> i have a tweener. >>> >>> i have just been avoiding the 'tweener mod' (since i want to see gumstix >>> bootup w/ robostix), but i guess that is my best bet right now. >>> >>> yeah, i checked the pins, i am pretty sure i got it right. >>> >>> thanks for the quick response. >> Are you powering the robostix? Or applying power on the wifi card? >> Because if you're not powering the robostix then you may get the >> behaviour you're seeing. The robostix has it's own voltage regulators >> which won't be powered if you plug in the power adapter to the wifi >> card. >> >> In fact, if you're using a wifi card, you may need to power both the >> robostix and the wifi card (becausemany wifi/gumstix combos draw more >> than the 500ma that the robostix voltage regulator can deliver). >> > > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |
From: leith <el...@st...> - 2006-05-31 23:01:11
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oh bummer. i was hoping to only use 4 AAA batteries. That doesn't seem like it will be enough then. Maybe one 9V, regulated to 5V for the robostix and 4V for the netCF? -leith Dave Hylands wrote: > Hi Leith > > On 5/31/06, leith <el...@st...> wrote: >> success! >> >> here is what works for me: >> >> 1. resistor between gumstix connect 3 and 4 on robostix >> 2. put power supply into netCF instead of robostix > > So your gumstix boots, but your robostix won't be working properly if > you don't power it (even though it may appear to work kind of, you'll > get weird problems, as others have discovered). > > You'll need to power both. You can buy the jacks at DigiKey. If you're > powering from a battery, you'll need to put a voltage regulator on the > power going into the netCF. > |
From: Dave H. <dhy...@gm...> - 2006-05-31 23:21:09
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Hi Leith (with a note for Gordon), > i was hoping to only use 4 AAA batteries. > > That doesn't seem like it will be enough then. Maybe one 9V, regulated > to 5V for the robostix and 4V for the netCF? You could use 4 AAA batteries. Feed the batteries directly into the robostix (it can take upto about 9v). Also feed the batteries into an LDO (like the MIC39101 - which can deliver 1A), and plug that into the netCF. Good alkalines (i.e. Duracells) are good down to about 0.8v. Rechargables (NiMH or NiVCAD) are good down to about 1.0v, so I'd recommend upping the number of batteries from 4 to 6 (because you need 5.5v to feed the voltage regulator). You'll get alot more life out of the batteries that way. Also, NiMH or NiCAD batteries are only 1.2v to start with. Hey Gordon - this would be a good upgrade to the robostix. Replace the 5219 LDO that feeds the gumstix with one of these. They're even pin compatible. So if you're handy with surface mount, you could remove the LDO on your robostix board and replace it with the MIC39101 ($1.40 at DigiKey). -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |