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by Jonn
Wed Jun 14, 2017 9:04 pm
Forum: Other projects
Topic: Interactive musical instrument
Replies: 1
Views: 505

Re: Interactive musical instrument

A Google image search found the project site https://raspberrypiwonderland.wordpress.com/2014/03/16/raspberry-pi-with-sensors/ . It has diagrams and such. Following the "Force Sensitive Resistor" link to https://www.adafruit.com/product/1075 shows it is for sensing force, pressure, and weight. It ma...
by Jonn
Sun Apr 19, 2015 7:48 pm
Forum: Gaming
Topic: OpenArena - unplayable - slow
Replies: 10
Views: 4659

Re: OpenArena - unplayable - slow

I was able to 'fix' the problem on a RaspberryPi 2 by removing and reinstalling: problem symptoms Openarena was opening in a window on the desktop and the mouse arrow w o u l d m o v e very slowly--I had to move a few millimeters and wait, move a few more and wait. The slow OpenArena said the resolu...
by Jonn
Mon Apr 13, 2015 2:00 am
Forum: Troubleshooting
Topic: Time Problems
Replies: 2
Views: 366

Re: Time Problems

As username pi, enter
sudo raspi-config

Use the arrow to choose Internationalisation, tab to highlight Select, press Enter then choose Timezone and navigate to the right one.

After returning to the prompt, check by entering
date
by Jonn
Mon Apr 13, 2015 1:38 am
Forum: Troubleshooting
Topic: Running mathematica as a different user
Replies: 1
Views: 395

Re: Running mathematica as a different user

I added a user and made it a member of some groups. As that user I was able to get the spikey dodecahedron splash image, the title window with links, and an editor window. I typed in: x := 1; y := 2; z := x + y; z Then I chose from the menu Evaluation and Evaluate Cells. It labeled the input and gav...
by Jonn
Sat Apr 11, 2015 6:36 am
Forum: Beginners
Topic: Networking Two PIs without internet or wires
Replies: 13
Views: 1742

Re: Networking Two PIs without internet or wires

That sounds interesting. A laser with a bit of fog to make the beam visible would give a showy demonstration. (Remember eye safety!) The Gerboard helps demonstrate some capabilities of the GPIO pins. At timecode [4:00-4:10] of the video, Gert mentions transmission of character information, but I sup...
by Jonn
Sat Apr 11, 2015 2:35 am
Forum: Beginners
Topic: What WiFi adapter?
Replies: 3
Views: 538

Re: What WiFi adapter?

The TP-Link TL-WN722N is listed under 'working adapters' at http://elinux.org/RPi_USB_Wi-Fi_Adapters . It says it needs a powered hub. (For other peripherals see http://elinux.org/RPi_VerifiedPeripherals#USB_Wi-Fi_Adapters .) You might be able to strengthen signal (or reduce competing signal) one si...
by Jonn
Wed Apr 08, 2015 7:43 am
Forum: Beginners
Topic: Choosing the right MicroSD
Replies: 3
Views: 1133

Re: Chooding the right MicroSD

Check http://elinux.org/RPi_SD_cards to see if the card is listed. and consider speed benchmarks http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=4076 What size card you'll need depends on the sizes of packages you might add or remove. Of course, having more space will ease any risk of running...
by Jonn
Sat Dec 27, 2014 9:15 am
Forum: Beginners
Topic: Copying NOOBS files to SD card
Replies: 6
Views: 7272

Re: Copying NOOBS files to SD card

Possible solution: I wanted to put the new NOOBS onto an SD card I had used before and got the 'parameter' error message too (Windows XP) while trying to copy files to it. I searched and found a post mentioning the error message and the 4GB filesize limitation of FAT32, but the big root.tar.xz file...
by Jonn
Thu Jan 17, 2013 1:41 am
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

Hi Manohar.k, A thought: If you put the experimental SD card in a USB card reader and attach it to your RaspberryPi's USB port, you could use a second SD card to boot the RaspberryPi with a Linux OS. You should then be able to use the Raspberry Pi to write to the experimental SD card. It might work ...
by Jonn
Fri Dec 14, 2012 5:18 am
Forum: Beginners
Topic: How to set the clock/time?
Replies: 24
Views: 26452

Re: How to set the clock/time?

man fake-hwclock may help. I imagine steps like: Get the timekeeping computer to construct (maintain) a file. Get the the data into YYYY-MM-DD hh:mm:ss format before the last step. Copy the file to the RaspberryPi. Move the file over fake-hwclock.data file. Load (force) the fake-hwclock.data file i...
by Jonn
Sun Sep 16, 2012 4:37 pm
Forum: Troubleshooting
Topic: Post all your errorS
Replies: 13
Views: 3643

Re: Post all your errorS

I think this is a good idea. I found this thread by searching 'kern.log'. I found the log files on the SD card, challenged by having keyboard and network problems. (See http://www.raspberrypi.org/phpBB3/viewtopic.php?f=24&t=13563 ). Now I can look at them and need reference to find out (maybe) what ...
by Jonn
Sun Sep 16, 2012 4:59 am
Forum: Troubleshooting
Topic: STICKY: Using the Troubleshooting Forum
Replies: 29
Views: 62307

Re: READ ME : Using the Troubleshooting Forum

I noticed a post with ' solved ' in the title. How does one indicate a post has been solved so a moderator can edit the title, like this minor example for the default time: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=17175 We don't just use the report post feature, do we? Also, someone me...
by Jonn
Sun Sep 16, 2012 4:14 am
Forum: Troubleshooting
Topic: From where comes the default time? [answered]
Replies: 8
Views: 15687

Solved: From where comes the default time?

It was embarrassingly easy :oops: to adjust the default time, but it was a good newbie exercise to find out how. :D An internet search guided me to the /sbin/hwclock program. I mounted the SD card to a PC running Linux and went to that directory. Using cat hwclock showed a parade of symbols represen...
by Jonn
Fri Sep 14, 2012 3:22 pm
Forum: Troubleshooting
Topic: From where comes the default time? [answered]
Replies: 8
Views: 15687

Re: From where comes the default time?

if you do set up the correct time it will use it, for now, but if you stop it for 10 days then it will start with the past time... Is there some kind of memory that retains the time for about 10 days after power is removed? I wonder if that could be why my RaspberryPi worked well the second time af...
by Jonn
Wed Sep 12, 2012 6:28 pm
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

Here is a post where the OP diagnosed the 25 MHz crystal oscillator with an oscilloscope , found was not working, and fixed it. http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=7533 It would be nice to see if and how the logs change before and after this particular problem is fixed. I should p...
by Jonn
Wed Sep 12, 2012 6:26 pm
Forum: Troubleshooting
Topic: NO usb device works
Replies: 30
Views: 9365

Re: NO usb device works

If someone has confirmed a non-oscillating crystal, as by oscilloscope, it could be helpful for others to save copies of the log files in /var/log *before* the fix and copies of the same log files after the fix for comparison. The differences could reveal what logged messages are present (or missing...
by Jonn
Wed Sep 12, 2012 5:03 pm
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

So... I guess I'll wait for the September Raspbian and let the board rest some more. You know that running sudo apt-get update sudo apt-get upgrade sudo reboot will update your system and there is no need for them to make a new image every month or for you to wait for a month, right? Thank you for ...
by Jonn
Wed Sep 12, 2012 3:03 pm
Forum: Troubleshooting
Topic: From where comes the default time? [answered]
Replies: 8
Views: 15687

From where comes the default time? [answered]

The RaspberryPi starts up with a default time. The July Raspbian kernel starts up with July 15 about 19:41:xx, and the August version starts up Aug 16 00:59:xx. How could one change the date and time on the SD card so that it would boot up with a different time? It might make it easier for those who...
by Jonn
Wed Sep 12, 2012 2:39 pm
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

Yesterday I booted the RaspberryPi again a few times with the Monoprice CYgma4 5V 2.1A charger I bought for it. I was able to log in with username and password the first time, but only that time. Having found some YouTube videos on power supplies and problems, I decided finally 'bite the bullet' and...
by Jonn
Mon Sep 03, 2012 12:28 am
Forum: Troubleshooting
Topic: keyboard malfunction at PW command
Replies: 7
Views: 1230

Re: keyboard malfunction at PW command

I wish I had the answer... Does your RaspberryPi boot reliably with just the SD card, a simple USB keyboard connected directly to the RaspberryPi, and a monitor (one only of either RCA or HDMI)? Does toggling CapsLock,ScrollLock, or NumLock show up on a keyboard LED, if the keyboard is compatible an...
by Jonn
Fri Aug 31, 2012 1:54 am
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

I found this: Polyfuses can take a very long time to completely recover from a "trip", sometimes days, even weeks, in fact in a sense they never get completely the same, but if they get down to say 3 Ohm (for the USB polyfuses F1 & F2) or 0.2 Ohm for the input polyfise F3 on the back of the board yo...
by Jonn
Thu Aug 30, 2012 3:52 am
Forum: Beginners
Topic: ethernet connection from RPi to laptop
Replies: 10
Views: 17656

Re: ethernet connection from RPi to laptop

It sounds like one could configure Internet Connection Sharing on the laptop as host, and use the default for the RPi. (This indicates the host will provide the IP: http://support.microsoft.com/kb/306126 .) It sounds like one could then just connect and reboot the RPi, and the RPi should get an IP f...
by Jonn
Thu Aug 30, 2012 1:39 am
Forum: Troubleshooting
Topic: Internet connection (with username & pass)
Replies: 9
Views: 2813

Re: Internet connection (with username & pass)

It would be better to add connections using a router or switch as already mentioned, but Windows XP allows 'Internet Connection Sharing'. It requires a second ethernet adapter and the PC works like a router and the PC would provide an IP address to the attached computer (e.g. the RaspberryPi). See h...
by Jonn
Tue Aug 28, 2012 6:22 am
Forum: General discussion
Topic: Request tool/access to SD post mortem 'out-of-body'
Replies: 29
Views: 11921

Re: Request tool/access to SD post mortem 'out-of-body'

Well... now I can check for clues in the log files for keyboard or network problems. Since there were two good sessions out of dozens of times booting suggests a hardware problem--It would be nice to be able to point to something in the logs that would be more definitive. After the RaspberryPi was o...
by Jonn
Mon Aug 27, 2012 11:42 pm
Forum: General discussion
Topic: Problems with USB/Ethernet Power
Replies: 3
Views: 866

Re: Problems with USB/Ethernet Power

There are several forum threads you may want to read to check, Check http://elinux.org/R-Pi_Troubleshooting#No_USB_device_works.2C_with_known_good_PS.2C_SD_card.2C_KB and follow the links into this forum at footnotes [13],[14],[15] to get started. Also look at http://www.raspberrypi.org/phpBB3/viewt...

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