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by obcd
Sat May 09, 2015 11:28 am
Forum: Troubleshooting
Topic: GPS get wrong time and no satellites
Replies: 18
Views: 2057

Re: GPS get wrong time and no satellites

I think his GPS is having an usb connection as it seems to use the prolific chipset and is accessed using ttyUSBx.
by obcd
Sat Apr 11, 2015 12:38 pm
Forum: Troubleshooting
Topic: RPiB locks up when connecting to GPIO
Replies: 13
Views: 1068

Re: RPiB locks up when connecting to GPIO

Besides all the other remarks, it looks like the relais board has some opto couplers that drive the relais. I read in the spec's that the input's are active low, so I assume a relais turns on when the input of the opto is pulled to GND. This probably means that the 2 VCC's you connect on the relais ...
by obcd
Sat Apr 11, 2015 12:17 pm
Forum: Troubleshooting
Topic: New USB hub not working
Replies: 16
Views: 560

Re: New USB hub not working

Does it work when the usb key is not connected to the Pi? (Maybe you need it for it's root fs?) Usb memory keys can be power hungry. The Pi usb can have problems when the supply voltage is below 4.85V. Some 7 port hubs are designed as a cascade of 2 four port hub chips. The second chip is connected ...
by obcd
Sat Apr 11, 2015 11:59 am
Forum: Troubleshooting
Topic: DS18B20 Temperature sensor and Relay activation
Replies: 16
Views: 979

Re: DS18B20 Temperature sensor and Relay activation

Are you sure you have the correct sensors. Some of them are designed to be used as 2 wire devices and are powered trough their data line. Those normally require a special circuit that charges an internal capacitor which provides power during temperature conversion and readout. You need the type that...
by obcd
Sat Apr 11, 2015 11:49 am
Forum: Troubleshooting
Topic: Pi2 won't stay off
Replies: 18
Views: 983

Re: Pi2 won't stay off

Try to pinpoint the cause of it's behavour. You can try another power supply to see if it still happens with that. Maybe your supply decides to switch off it's output voltage if it's load falls below a treshold, which might happen when the Pi is in standby. You can disconnect the HDMI cable and chec...
by obcd
Sat Mar 28, 2015 1:23 pm
Forum: Troubleshooting
Topic: Red light goes off when SD card inserted
Replies: 9
Views: 649

Re: Red light goes off when SD card inserted

You could try the SD card in your PC to see if it's broken before you buy a new one.
If the SD card is fine, it's time to check if your Pi is still under warranty in my humble opinion.
by obcd
Fri Mar 27, 2015 5:05 pm
Forum: Troubleshooting
Topic: Games not working
Replies: 14
Views: 749

Re: Games not working

What output do you see in LXTerminal when you run the command?
by obcd
Fri Mar 27, 2015 4:13 pm
Forum: Troubleshooting
Topic: Red light goes off when SD card inserted
Replies: 9
Views: 649

Re: Red light goes off when SD card inserted

Maybe your power adapter is dead. With the sd card inserted, it will consume more current. This might drop the power adapter output voltage so that the led goes out. Any chanche you have another adapter you could use to test? Another option is measuring the output voltage if you have the equipment f...
by obcd
Fri Mar 27, 2015 4:08 pm
Forum: Troubleshooting
Topic: Games not working
Replies: 14
Views: 749

Re: Games not working

"python games" icon launches the following command:

sh -c $HOME/python_games/launcher.sh

so you can open an LXTerminal session and type that line.

if you "for instance" don't have a python_games folder in your home folder, it should tell you.
by obcd
Fri Mar 27, 2015 3:50 pm
Forum: Troubleshooting
Topic: Games not working
Replies: 14
Views: 749

Re: Games not working

Try to launch the games from within a terminal window and see what output you get.
If it's not starting, I would expect an error message on the terminal screen.
You really aren't telling much about your setup, so it's hard to give more accurate help.
by obcd
Tue Mar 24, 2015 3:27 pm
Forum: Troubleshooting
Topic: Pi's ram slowly filling (lighter Raspbian alternative?)
Replies: 2
Views: 268

Re: Pi's ram slowly filling (lighter Raspbian alternative?)

Maybe one of the things you installed has a memory leak. If a program allocates memory for a resource and doesn't release it properly, it will gradually use more and more memory. You can run top from a command prompt to see what is running and how much memory it is consuming. You can quit top with t...
by obcd
Tue Mar 24, 2015 1:22 pm
Forum: Troubleshooting
Topic: automatically log into network
Replies: 1
Views: 216

Re: automatically log into network

I assume it will have the graphic shell running? You will need to add some lines to a startup script sudo nano /etc/xdg/lxsession/LXDE-pi/autostart # @xscreensaver -no-splash # activate a vnc server for the current session @x11vnc -bg -usepw -forever -rfbport 5900 -display :0 # disable screen savers...
by obcd
Tue Mar 24, 2015 12:53 pm
Forum: Troubleshooting
Topic: wifi-dongles don't work
Replies: 4
Views: 279

Re: wifi-dongles don't work

Maybe it's a speed issue. You could try to add a delay to the boot cmdline.txt (not sure about the syntax) bootdelay=xxx if I remember well. The pi 2 boots faster. Maybe the wifi adapters are not getting enough time to initialise and startup properly.
by obcd
Tue Mar 24, 2015 12:46 pm
Forum: Troubleshooting
Topic: cloning SD card
Replies: 2
Views: 403

Re: cloning SD card

If you copy the 8 gig image to a 16 gig card, that one will have the same partitions and 8 gig of unused space after the last partition. You can install gparted on the Pi to decrease the size of the last partition so that the system fits on a smaller 8 gig card. I can't remember if the program will ...
by obcd
Sat Mar 21, 2015 5:43 pm
Forum: Troubleshooting
Topic: DVI monitor
Replies: 1
Views: 209

Re: DVI monitor

Monitors have a way to tell the connected device what there optimal settings are. It's called the edid interface. Maybe the newer monitor is passing some resolutions to the Pi it can't handle properly. You can override those monitor edid settings (and even ignore them totally) by editing the config....
by obcd
Wed Feb 25, 2015 3:12 pm
Forum: Troubleshooting
Topic: Very high shock in raspberry PI 2 Model B
Replies: 7
Views: 834

Re: Very high shock in raspberry PI 2 Model B

The Pi is powered with 5V. A voltage that low shouldn't bite you. The problem is usually the power adapter. Those are most of the time not having a ground connection. This means that the secundary ground can carry some mains voltage in reference to earth. If you touch that, it will cause a current f...
by obcd
Tue Feb 17, 2015 1:27 pm
Forum: Troubleshooting
Topic: 3G modem stability
Replies: 2
Views: 1146

Re: 3G modem stability

Have you tried to power the modem stick directly without that transistor. What transistor are you using? If the 3G needs between 500mA and 1A, I doubt the Pi can deliver enough base current to fully drive the transistor. This might result in voltage drops which might trigger the usb instabilities. Y...
by obcd
Wed Feb 11, 2015 11:07 am
Forum: Troubleshooting
Topic: RPI2 power issues?
Replies: 12
Views: 1507

Re: RPI2 power issues?

Could it be RF interference from the stick into the Pi electronics? I had some issues with a Huawei 3G stick. When I put a cable between the stick and the Pi, the problems went away. Maybe your Y cable is doing the same and making the distance from the stick to the Pi larger decreasing possible inte...
by obcd
Fri Jan 17, 2014 12:54 pm
Forum: Troubleshooting
Topic: rPi GPIO to Mosfet - won't fire relay coil
Replies: 10
Views: 2811

Re: rPi GPIO to Mosfet - won't fire relay coil

You could connect the led with a decent serie resistor on the 24V relais voltage as well. Due to the high voltage drop over those resistors, they will heat up a little. Assume you want 8mA passing trough your led. R = 24 - 1.2 / 0.008 = 2850 Ohm P = I * I * R = 0.008 * 0.008 * 2850 = 0.18W So basica...
by obcd
Thu Jan 16, 2014 3:06 pm
Forum: Troubleshooting
Topic: Showing error
Replies: 5
Views: 312

Re: Showing error

You might start by giving a little more information.
Real time videos?
Do you mean video from the Pi camera?
Ethernet optical link?
The Pi ethernet connector is only 100Mbit, so why an optical link?
by obcd
Thu Jan 16, 2014 2:58 pm
Forum: Troubleshooting
Topic: rPi GPIO to Mosfet - won't fire relay coil
Replies: 10
Views: 2811

Re: rPi GPIO to Mosfet - won't fire relay coil

Have a look at npn darlington transistors like TIP120 instead of mosfets. You will need a resistor (1K)between your gpio output and the base of the darlington transistor. A darlington only needs 1.4 - 1.5V to conduct. It's current driven while mosfet gates are voltage driven. Due to the fact it's a ...
by obcd
Tue Jan 07, 2014 9:28 am
Forum: Troubleshooting
Topic: Connecting to internet via cable and router
Replies: 7
Views: 642

Re: Connecting to internet via cable and router

Try to connect an ethernet switch to the wall socket and connect the Pi to that switch. If the problem is 2 much attenuation of the ethernet signals, that should fix the issue. I once serviced some bad wiring connection. An old pc with 10Mbit adapter could connect fine. A newer one with a 100Mbit ad...
by obcd
Mon Jan 06, 2014 1:51 pm
Forum: Troubleshooting
Topic: Connecting to internet via cable and router
Replies: 7
Views: 642

Re: Connecting to internet via cable and router

It could still be the cable and the wall socket. Most network adapter have an option to swith to 10Mbit speed if 100Mbit isn't working. At 10Mbit, only 2 pair = 4 wire of the 8 are used. For 100Mbit, you need all 4 pair if I remember well. I have no idea if the Pi would work when only 2 pair of the ...
by obcd
Tue Dec 24, 2013 3:45 pm
Forum: Troubleshooting
Topic: Edimax Wi-Fi adapter not functioning correctly
Replies: 27
Views: 2247

Re: Edimax Wi-Fi adapter not functioning correctly

If you have both ethernet and wifi connected to the same subnet, isn't it using the wired connection for it's communication? In such case, it might get it's dhcp for the wifi adapter trough the cable.
by obcd
Tue Dec 24, 2013 3:15 pm
Forum: Troubleshooting
Topic: Car stereo - Raspbmc question
Replies: 9
Views: 1134

Re: Car stereo - Raspbmc question

The terminology isn't raspberry pi related. It's the DLNA way of defining the system components. I am not an apple user myself, but I am sure some will be able to answer your question. A DLNA approach would use your iphone as server only and the Pi as controller and rederer. Be aware that the analog...

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