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by jnd
Mon Oct 22, 2012 12:12 am
Forum: General discussion
Topic: Raspberry Pi with 512mb RAM in the Wild and Element14...
Replies: 213
Views: 52240

Re: Raspberry Pi with 512mb RAM in the Wild and Element14...

It does seem that the price at Farnell went higher since the memory upgrade, anyone noticed it? I thought the new revision would be selling at or near the official price of $35. RS does but Farnell doesn't. For my regional page (Czech) it shows as $42.43 per board, that is without VAT and without sh...
by jnd
Mon Oct 15, 2012 3:47 pm
Forum: General discussion
Topic: Is 512mb a good thing?
Replies: 109
Views: 23487

Re: Is 512mb a good thing?

As I'm reading all the Rasbperry Pi comments everywhere I feel like I'm alone with my relatively low memory needs. I guess more RAM is always good for the buffers and cache but my board is running Python script and two webservers with just under 60 MB used. Should I add more bloat and complain "256 ...
by jnd
Thu Oct 11, 2012 2:52 pm
Forum: General programming discussion
Topic: Avoid frequent writes to SD card when capturing sensor data
Replies: 4
Views: 1216

Re: Avoid frequent writes to SD card when capturing sensor d

Thanks for the hint, I looked up the /run stuff and found that /run/shm or /dev/shm (depending on system) is exactly what I need.

/tmp is not good because it's on disk which I'm trying to avoid.
by jnd
Tue Oct 09, 2012 5:02 pm
Forum: General programming discussion
Topic: Avoid frequent writes to SD card when capturing sensor data
Replies: 4
Views: 1216

Avoid frequent writes to SD card when capturing sensor data

I have Raspberry which has LED matrix display, webserver and will have couple of sensors which will be logged to cosm.com as well as showed in browser and on the LED display. I'd like to capture the sensor data to temporary file with only the latest values so other applications can read from it. I n...
by jnd
Mon Oct 08, 2012 4:09 pm
Forum: Troubleshooting
Topic: Experiencing slow response with Raspbian 2012-09-18
Replies: 12
Views: 12067

Re: Experiencing slow response with Raspbian 2012-09-18

I noticed the ssh prompt delay few weeks ago, I update regularly but the problem still remains. I have no idea why it is like that but on Arch in works instantly as it should on any system.
by jnd
Tue Aug 07, 2012 11:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO performance and output waveforms
Replies: 1
Views: 3583

GPIO performance and output waveforms

Inspired by this topic http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=10170 I wanted to check the GPIO performance in Python and C, generating simple square wave with various delays since it's necessary for many slower devices to maintain minimal timing requirements. I also measured the outp...
by jnd
Thu Aug 02, 2012 3:38 pm
Forum: General discussion
Topic: Heat Sinks, Do YOU need them.
Replies: 86
Views: 191303

Re: Heat Sinks, Do YOU need them.

Do you have a link to the data sheet for these temp limits? 100c seems high to me 150c is just crazy. I'm not saying they don't but I have never seen a semiconductor operate correctly at those temps. These values usually mean the junction or silicon temperature which can be significantly higher tha...
by jnd
Thu Aug 02, 2012 1:49 pm
Forum: General discussion
Topic: Farnell VS RS delivery times
Replies: 143
Views: 29475

Re: Farnell VS RS delivery times

Pihkal wrote:Did you order a case or psu with your pi or just the pi?
Yeah, I ordered Pi with just the EU power adapter.
by jnd
Thu Aug 02, 2012 9:16 am
Forum: General discussion
Topic: Farnell VS RS delivery times
Replies: 143
Views: 29475

Re: Farnell VS RS delivery times

I got mine yesterday, order number was 103xxx even though I re-registered few days after launch (the first time it didn't work, RS didn't send confirmation) so it took only 5 months... Just for comparison if you want to buy new Raspberry today. RS website: Despatch expected in 17 week(s). Farnell: E...
by jnd
Thu Aug 02, 2012 12:48 am
Forum: General discussion
Topic: Order and Shipping update from RS & Allied
Replies: 775
Views: 143891

Re: Order and Shipping update from RS & Allied

Registered at the launch date but later found it it wasn't received, managed to re-register again still within the first week, got confirmation on 9. 3., preorder code finally on 19. 6., paid within few days with Paypal and got 103xxx order number. DHL Shipment Notification arrived on 31. 7. and the...
by jnd
Thu Aug 02, 2012 12:35 am
Forum: HATs and other add-ons
Topic: Slice of Pi + XBee Pro S2
Replies: 3
Views: 4408

Re: Slice of Pi + XBee Pro S2

How much power does the Xbee need? It is 3.3 V device, right? You could probably just add some 5 -> 3.3 V regulator.

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