Raspberry Pi Forums

MaxK1

Can you post the output of iwconfig and dmesg when you lose the wifi connection? You will usually get the same IP address when the dhcp assigned address is renewed, if you want a "predictable" address, you should look into assigning a static IP address. Your AP should have a range of addresses avail...

MaxK1

"... and some Rx and Tx stats"
I'd like to know those as well. There is more to Wifi than just signal strength!
If/when it does drop, everything from dmesg that references "wlan".

MaxK1

what does iwconfig show?

MaxK1

You should be able to find a power supply from an older (ie no longer in use) desktop that has 5V@40A pretty easily and cheaply. Certainly new ones are available, but personally, I prefer scrounging... ;-) You'll want to use short, heavy gauge wiring as much as possible and possibly consider connect...

MaxK1

dmesg shows the kernel error/event messages. Very handy for debugging.
But your comment about contact cleaner leads me to think you have a cable problem...

MaxK1

Anything show up in dmesg? It could be a bad cable or connector.

MaxK1

Does your HDMI->VGA converter require a separate power source? Have you tried adding config_hdmi_boost=n to /boot/config.txt? where 'n' can be in the range 6 to 11, although I don't think values >7 are suggested. The other thing I thought of is perhaps the cable to the pi (HDMI) end is not fully mak...

MaxK1

Have you verified that the converter and all cables work?

MaxK1

Which corruption issue?
The one involving counterfeit cards? The one involving bad power supplies? The one involving SD cards that have reached the end of useful life?

MaxK1

The Rpi itself may be OK with the voltage dropping below 4.63V, but there are no guarantees for anything connected to the USB ports. Some devices may get kinda hinkey if the voltage dips below 4.75, even for an instant, and then you can get into that horrible USB reset "black hole" which in turn tri...

MaxK1

Exactamundo

at least it isn't some random string!

MaxK1

OK - that's something to look into... A least easier to figure out than just taking 256 pot shots at it... Back to the OP's question. You can store 56 bytes in a DS1307 and as Dougie says it'll survive until the battery dies AND the power goes off, so you can store your data (2 bytes) and a date/tim...

MaxK1

Hmm - nvram on my system now shows up in /sys/devices/platform/soc/3f804000.i2c/i2c-1/1-0068/nvram which is different from Dougies, which shows up as /sys/devices/platform/soc/20804000.i2c/i2c-1/1-0068/nvram

MaxK1

Well that just rolls off the tongue, doesn't it? :lol: My system no longer shows /dev/nvram either - I haven't used it in over a year and I assumed it hadn't changed. My Bad... :oops: There has to be a way of linking to it/finding it that doesnt involve jumping through hoops though. Time to do a lit...

MaxK1

You stated that you have the latest Raspbian - Have you updated/upgraded/dist-upgrade to be sure you have the latest driver and firmware? What kind of ping times do you get to your router?

MaxK1

If you have (or add) an RTC, you could write to /dev/nvram which is battery backed. They are fairly inexpensive as kits or you can make your own DS1307 board...

MaxK1

Curious. There should be some change if you move the dongle around, even if it's minor... I suspect the dongle or the driver is not correctly reporting the information needed. Can you post the output from lsusb? And did you change the wifi channel?

MaxK1

Sorry 'bout that...

MaxK1

" Other users have similar setups with no RF interference. " Yeah - we have Pi users with no power issues because the PSU has 5V 2.5A printed on the bottom... So it must be 5V 2.5A, right? So why is the red LED blinking...? Unless you check around for RF noise with a SpecAn, you won't know. Next bes...

MaxK1

As long as the QC process is the same at all 3 factories and all 3 are sourcing quality parts it shouldn't make a difference...

I'll bet the foundation never thought they would have that "problem"!

MaxK1

I just looked into my drawers and found a Trust 2005 USB hub that worked! Must have been horribly uncomfortable walking around with that in your drawers ;-) Another solution to the single power cable would be to get a 2.5A or 3A supply and split the output from that to a micro USB connector and wha...

MaxK1

Do you have 2 identical dongles? Or just the one you moved to the other Rpi 0? If you have more than 1, do they all show the same problem?

MaxK1

A very useful item is a USB to uSD card adapter (Or one of the xxx-in-one card readers). USB 2 "thumb" drives can also be handy.
Neither of those items need to be outrageously spendy. He'll figure out what he needs as time goes on

MaxK1

What does "iwconfig wlan0" have to say about your connection? Try plugging it in to a short USB extension cable and physically move it away from your power supply, monitor, hub and of course the Pi itself. Any or all those components are capable of generating enough RF hash to cause problems for tho...

MaxK1

Could be a "sleeping crystal" - Marked X1 (IIRC) on the bottom of the board. You may be able to get it going again with a firm tap using a pencil or flicking it sharply with your thumb nail (this was a fairly common problem/solution on early Rpi B models) Others have solved it by re-flowing the sold...

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