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by wh7qq
Wed Nov 02, 2016 4:17 am
Forum: Troubleshooting
Topic: RPi Model B GPIO Faulty?
Replies: 4
Views: 580

Re: RPi Model B GPIO Faulty?

Several parts to this response: First, electronic. The outputs of the RPi are limited in their ability to sink or source current...15ma sink generally and I think less on source. an LED should never be installed directly across a power pin or ground and an input without a series current limiting res...
by wh7qq
Mon Oct 31, 2016 8:22 pm
Forum: Troubleshooting
Topic: STICKY: Using the Troubleshooting Forum
Replies: 29
Views: 80266

Re: READ ME : Using the Troubleshooting Forum

I have a complaint or request, depending on your point of view, of posters requesting help and then never coming back to the forum to give feedback as to their success or failure with the advice given. The person helping never gets to know if his advice did the job or not. It would really be helpful...
by wh7qq
Sat Oct 29, 2016 8:56 pm
Forum: Troubleshooting
Topic: Lightning bolt icon
Replies: 22
Views: 15033

Re: Lightning bolt icon

Check http://www.adafruit.com but also look at their USB cables for a large gauge cord. The voltage drop in the cable can be enough to cause a low voltage signal during power hungry activities. You might not see these when you check with the DVM or multimeter. 2 amps should be plenty but the cord us...
by wh7qq
Sat Oct 29, 2016 8:40 pm
Forum: Troubleshooting
Topic: Wifi network not detected
Replies: 1
Views: 324

Re: Wifi network not detected

When you say "I can't view my wifi network" does that mean you cannot connect to it or that you can't get to the admin pages on the router? The router may be set to prevent changing its settings via wifi. I don't use the R7000 so I can't speak to the way its web interface or defaults are set up. On ...
by wh7qq
Sat Oct 29, 2016 8:32 pm
Forum: Troubleshooting
Topic: D-BUS not working after upgrade to jessie
Replies: 1
Views: 877

Re: D-BUS not working after upgrade to jessie

Did you do sudo apt-get dist-upgrade rather than a new install? Jessie uses systemd that introduces many incompatibilities with the initd system in wheezy so that a fresh install is preferable unless you just enjoy sorting out that kind of mess. The dist-upgrade option is a little chancy in my limit...
by wh7qq
Sat Oct 29, 2016 8:22 pm
Forum: Troubleshooting
Topic: Raspberry Pi desktop
Replies: 1
Views: 341

Re: Raspberry Pi desktop

Try a right-click on the panel and select "Panel preferences".
by wh7qq
Sat Oct 29, 2016 8:16 pm
Forum: Troubleshooting
Topic: kernel panics on Pi 3
Replies: 4
Views: 775

Re: kernel panics on Pi 3

Have you tried another SD card or a fresh download? Did you verify the checksum on the Download?
by wh7qq
Sat Oct 29, 2016 8:12 pm
Forum: Troubleshooting
Topic: Noobs installation won't download
Replies: 2
Views: 356

Re: Noobs installation won't download

Maybe a bad download (did you verify the checksum) or a bad SD card. Also, are you sure your ethernet connection to the Pi is good?
by wh7qq
Sat Oct 29, 2016 8:07 pm
Forum: Troubleshooting
Topic: Lightning bolt icon
Replies: 22
Views: 15033

Re: Lightning bolt icon

The charger is likely fine but the cable may well be at fault. Depending on what the Pi3 is doing, the lightning bolt may come on and off and it really is not too much of a problem if it is only once in a while and does not linger. Mine shows up only during boot now but I used to see the "rainbow" f...
by wh7qq
Sat Oct 29, 2016 7:44 pm
Forum: Troubleshooting
Topic: [SOLVED] Just another "SD card won't boot" post...
Replies: 5
Views: 2058

Re: Just another "SD card won't boot" post...

If I understand your post correctly, your problem is just with one particular SD card. If the boot partion gets FU'd, it will behave much as you describe. If that is the case, you should salvage your files and re-partition the card. Sometimes gparted will come back with an error due to no partition ...
by wh7qq
Sat Oct 29, 2016 5:15 pm
Forum: Troubleshooting
Topic: Hidden Wastebasket?
Replies: 6
Views: 4530

Re: Hidden Wastebasket?

Pcmanfm uses the standard location ~/.local/share/Trash/ to store files and their information prior to deleting (the file is moved in to Trash/files/ and an extra file is created in Trash/info/ for each file to say where the file came from so technically deleting to the wastebasket increases the am...
by wh7qq
Fri Oct 28, 2016 9:24 pm
Forum: Troubleshooting
Topic: Hidden Wastebasket?
Replies: 6
Views: 4530

Re: Hidden Wastebasket?

Interesting question. This one ran me around a bit before the answer came to me (I think). I think your question can be answered by the fact that when you do pcmanfm as root, you are not in your home directory so things you delete do not show up there and the directory size may not reflect the chang...
by wh7qq
Thu Oct 27, 2016 4:54 am
Forum: Troubleshooting
Topic: Installing LXDE makes Raspberry Pi 3 freeze in every boot
Replies: 1
Views: 1107

Re: Installing LXDE makes Raspberry Pi 3 freeze in every boo

From the MathWorks web page:"Note that you cannot install MATLAB as a standalone application or execute MATLAB code locally on a Raspberry Pi. To develop applications for the Raspberry Pi to be used in standalone operation, please see the Raspberry Pi Support from Simulink®." I think you need to rea...
by wh7qq
Wed Oct 26, 2016 8:09 pm
Forum: Troubleshooting
Topic: HDMI video output on PI3 goes on and off...
Replies: 7
Views: 1030

Re: HDMI video output on PI3 goes on and off...

I've got a PI3 and it has Rasbian (Latest version) on it and also OSMC with noobs. I'm not sure how you have done this on a single sd card...I was unaware that you could do multiple OS boots from one card. Try it with a fresh install of Raspbian alone on the sd card. See if that doesn't fix your HD...
by wh7qq
Wed Oct 26, 2016 7:32 pm
Forum: Troubleshooting
Topic: Problem with ssh from linux to raspberry
Replies: 10
Views: 1647

Re: Problem with ssh from linux to raspberry

I simply do ssh pi@192.168.1.x (Bad on me, I haven't changed the username) from a linux terminal to either a Raspberry Pi B+ or a RPi 3 or any linux terminal. The command prompt changes to reflect the different device but otherwise works just like a normal terminal. I just did an apt-get install ras...
by wh7qq
Mon Oct 24, 2016 8:11 pm
Forum: Troubleshooting
Topic: False reading from Rain gauge pin
Replies: 26
Views: 4197

Re: False reading from Rain gauge pin

@andyroo21: It is strictly a designer's choice to use the input normally pulled up or down with a resistor and to short to the opposite rail when the switch closes. The software has to change accordingly. You might want to put a 1K resistor in between the relay contact and the input just in case of ...
by wh7qq
Sun Oct 23, 2016 8:41 pm
Forum: Troubleshooting
Topic: False reading from Rain gauge pin
Replies: 26
Views: 4197

Re: False reading from Rain gauge pin

Is this a possibility that the moving magnet that operates the reed switch Might be introducing a signal in to the reed switch wire leads, It is well known Fact if moving a magnet across a copper wire, this will generate a EMF in the Wire. I might be right or I might be wrong. In principle, correct...
by wh7qq
Sun Oct 23, 2016 7:33 pm
Forum: Troubleshooting
Topic: False reading from Rain gauge pin
Replies: 26
Views: 4197

Re: False reading from Rain gauge pin

So why bother with the 10K to ground? That holds your input at just about 1.1 volts. I don't recall (in fact, neither Broadcom or Raspberry seem to publish this spec and it probably varies from Pi to Pi) the exact transition point on the input but you are setting the input level closer to it than ne...
by wh7qq
Sun Oct 23, 2016 7:09 pm
Forum: Troubleshooting
Topic: False reading from Rain gauge pin
Replies: 26
Views: 4197

Re: False reading from Rain gauge pin

Your schematic diagram doesn't show values for the resistors you have on the input. It also does not indicate if the reed relay is normally open or closed...many can be wired either way. In any case, on contact closure, your input goes to the level determined by the values of the two resistors. If t...
by wh7qq
Sat Oct 22, 2016 5:15 pm
Forum: Troubleshooting
Topic: Loosing wifi connection...getting it again after some time
Replies: 1
Views: 422

Re: Loosing wifi connection...getting it again after some ti

There are several things to try. It sounds like you are getting some kind of interference with your wifi signal, either a neighbor who is using the same channel or another device like a microwave oven or portable phone. First, try changing the channel setting in your router's firmware. You may still...
by wh7qq
Fri Oct 21, 2016 9:16 pm
Forum: Troubleshooting
Topic: WLAN0 does not show up in ifconfig
Replies: 1
Views: 6388

Re: WLAN0 does not show up in ifconfig

Start with https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=44044 . Toward the bottom of the rather long first post you may find some helpful information. Go to later posts if that doesn't get you working. Much of that was written prior to the Pi3. Fresh installs of Raspbian should find the w...
by wh7qq
Fri Oct 21, 2016 7:42 pm
Forum: Troubleshooting
Topic: Can't get past login-screen
Replies: 6
Views: 3646

Re: Can't get past login-screen

Regarding your keyboard problem, unless you load from Noobs and change the keyboard selection in the panel at the bottom of the OS selection page, the keyboard will revert to gb or eu every time. If you load Raspbian directly, you don't have that option and it will change back regardless of what you...
by wh7qq
Fri Oct 21, 2016 7:26 pm
Forum: Troubleshooting
Topic: False reading from Rain gauge pin
Replies: 26
Views: 4197

Re: False reading from Rain gauge pin

The GPIO pin is going to record a state change every time it senses a contact closure and just putting caps across the line is not going to de-bounce it adequately. Have a look at https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/buttons_and_switches/ or google "de-bounce gpio raspberry"...
by wh7qq
Fri Oct 21, 2016 7:10 pm
Forum: Troubleshooting
Topic: Pi crashes, all files disappear
Replies: 2
Views: 643

Re: Pi crashes, all files disappear

The first thing to try is a fresh SD card loaded with a fresh copy of Raspbian. See if it boots ok, runs ssh ok, and stays up as it should. You could have had a power failure or a brown out at a time when the Pi was writing to something in the SD card. That would bork the SD card but not so much tha...
by wh7qq
Fri Oct 21, 2016 3:10 am
Forum: Troubleshooting
Topic: Eth0 cable connection only connects locally.
Replies: 2
Views: 455

Re: Eth0 cable connection only connects locally.

We need some more information. What Pi and what OS are you using? Versions? What is between your Pi and the internet? Router, modem, switch? What does

Code: Select all

ifconfig
return? Can you ping outside sites, say 8.8.8.8 or http://www.yahoo.com? Results?

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