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by der-don
Tue Jan 06, 2015 9:07 am
Forum: Other projects
Topic: pi on a car battery?
Replies: 9
Views: 3381

Re: pi on a car battery?

If you were drawing 500ma from a 50Ah battery you could reasonably expect ~100 hours of operation. Or you go for a large 230 Ah battery and get 460 hours (slightly more than 19 days) of operation. But a battery like this is not only expensive (starting from about 210 €) but also large and heavy. An...
by der-don
Mon Jan 05, 2015 11:32 am
Forum: Compute Module
Topic: Compute Module Super Computer/Cluster
Replies: 24
Views: 37250

Re: Compute Module Super Computer/Cluster

To be honest I didn't think about the details, because I don't have a clue what I have to consider when designing such a board.
by der-don
Tue Sep 09, 2014 10:01 am
Forum: Compute Module
Topic: Compute Module Super Computer/Cluster
Replies: 24
Views: 37250

Re: Compute Module Super Computer/Cluster

If anyone builds a board for the compute module like this, let me know.

All I'd need is a board for 8-16 PIs, one or two external connectors for the power supply and the 8-16 external gigabit connectors.
by der-don
Tue Sep 25, 2012 4:56 pm
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

@DevelopNow @der-don Great that you guys got things working by re-writing the "config.txt"! Could you check in a day or two if those settings/that file remains intact? (unscrambled) Just checked it, after 3 days and a handful reboots, the config.txt is still intact. That's great! it raises more que...
by der-don
Mon Sep 24, 2012 11:11 pm
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

Ed Raket wrote:@DevelopNow
@der-don

Great that you guys got things working by re-writing the "config.txt"! Could you check in a day or two if those settings/that file remains intact? (unscrambled)
Just checked it, after 3 days and a handful reboots, the config.txt is still intact.
by der-don
Mon Sep 24, 2012 6:08 am
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

Thanks a lot for your fast feedback dom and Ed Raket. Yes there were some strange characters/symbols in the file config.txt in the comment line above the line with the arm_freq=... First I tried to remove the strange characters with nano. But after reboot there were even more strange characters. So...
by der-don
Sat Sep 22, 2012 5:08 pm
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

[ 1.958928] bcm2835-cpufreq: min=700000 max=700000 cur=700000 max should be more than 700000 for overclocking. Have you selected an overclock option from raspi-config? You could just edit /boot/config.txt and ensure arm_freq=900 (or similar). Yes, I did that. It worked for the first time when I inc...
by der-don
Sat Sep 22, 2012 2:22 pm
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

I measure it using cpufreq-info (you have to install cpufrequtils to use that). It shows the minimum frequency, the maximum frequency and the current frequency and they're all set to 700 MHz. And I measured speed with this command: time echo "scale=2000; a(1)*4" | bc -l It took about 29 seconds on ...
by der-don
Fri Sep 21, 2012 9:42 pm
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

But now I've encountered a problem. The first switch to the 900 MHz boost level worked (as shown in the video), then I tried 1 GHz, but the RasPi started with 700 MHz again. When I try to another level, it just doesn't work, the cpu frequency remains at 700 MHz. I'm selecting a speed, reboot and th...
by der-don
Fri Sep 21, 2012 9:13 am
Forum: Raspbian
Topic: Updating to the 2012-09-18-wheezy-raspbian image
Replies: 228
Views: 206308

Re: Updating to the 2012-09-18-wheezy-raspbian image

Hey folks, first of all I want to thank you for implementing the turbo mode. Free extra performance! :) I'v already made a youtube video (in German) about it http://www.youtube.com/watch?v=6z5wU11lTr0 But now I've encountered a problem. The first switch to the 900 MHz boost level worked (as shown in...

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