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by Blars
Sat Sep 22, 2012 3:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: device not found
Replies: 4
Views: 1098

Re: device not foundsecond channel i2c

gians wrote: :?: But how can I change the address for my device?
Depends on the device, read the data sheet. Most I2C chips have one or two address pins, that you tie high or low to change the address. Sometimes there are ways to get more addresses, by leaving open, tieing to one of the i2c lines, etc.
by Blars
Fri Sep 14, 2012 9:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Opto-isolator directly driven by GPIO port?
Replies: 21
Views: 24378

Re: Opto-isolator directly driven by GPIO port?

You should use a current limiting resistor. If your opto needs 1ma and drops 0.6 volts,
(3.3-0.6)/0.001 = 2.7k ohms
by Blars
Tue Sep 11, 2012 3:23 pm
Forum: Raspbian
Topic: Removing xorg from raspbian
Replies: 23
Views: 29937

Re: Removing xorg from raspbian

If you want to go for more space saving, you may look at replacing packages with the emdebian versions. emdebian is compatable with debian packages, but drops stuff like documentation.
by Blars
Sun Aug 26, 2012 10:09 pm
Forum: Raspbian
Topic: Finding out about Raspian updates
Replies: 15
Views: 3311

Re: Finding out about Raspian updates

That's not such a great tactic imho, because Debian does "only" bug and security fixes within a branch (Wheezy in this case). Both are always a good thing to have. preceed "branch" with "stable or oldstable". Wheezy is a testing release currently, and is still being updated somewhat. (at a slow rat...
by Blars
Sat Aug 25, 2012 5:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: i2c GPS Modules
Replies: 6
Views: 6526

Re: i2c GPS Modules

You'll probably find that USB ones are cheaper and easier to find. They sell for less than most serial gps modules in small quantities, and normally contain a serial gps and usb-serial converter chip.
by Blars
Sun Jul 01, 2012 11:15 pm
Forum: Other projects
Topic: power use reduction
Replies: 0
Views: 475

power use reduction

The obvious hardware hack to reduce power use about 25% made it to hackaday: http://hackaday.com/2012/06/30/raspberr ... nsumption/

I've been planning something like this for my pi.
by Blars
Sun Jul 01, 2012 11:10 pm
Forum: User groups and events
Topic: Portland, Oregon
Replies: 27
Views: 25874

Re: Portland, Oregon

I'm spending the summer near government camp, oregon working in a campground. I've booted my pi but not done much with it yet. I hope to get my network problems fixed soon so I won't need to drive 30 miles for my internet fix.
by Blars
Sun Apr 22, 2012 8:23 pm
Forum: Other projects
Topic: CAN Interface
Replies: 103
Views: 101682

Re: CAN Interface

USB or bluetooth interfaced GPS devices seem to be more readily available and frequently cheaper than serial ones.  Some of the USB ones use a serial-USB chip.
by Blars
Fri Apr 13, 2012 6:51 pm
Forum: Raspbian
Topic: HISTORY: The start of raspbian (Debian Hard Float (armhf) for RPi)
Replies: 613
Views: 336653

Re: Debian Hard Float (armhf) for RPi

I'm using ramhost.us for my personal virtual server, the main problem is they tend to be sold out most of the time.  (they have server farms in the uk and germany as well as the us)  You will obviously need more disk space and bandwidth than my $5/month account gives me.
by Blars
Thu Apr 12, 2012 9:37 pm
Forum: General discussion
Topic: DebConf 12 Registration open and call for papers
Replies: 0
Views: 598

Re: DebConf 12 Registration open and call for papers

<r>DebConf is the anual Debian convention.  The following is from <URL url="http://debconf12.debconf.org/">http://debconf12.debconf.org/</URL><br/> <br/> <br/> Registration open for DebConf12<br/> <br/> The Debian Project is pleased to announce that registration is now open for DebConf12, which will...
by Blars
Wed Mar 28, 2012 9:21 pm
Forum: Off topic discussion
Topic: Interfacing 3.3v to 5v logic
Replies: 1
Views: 1004

Re: Interfacing 3.3v to 5v logic

<r>For those of you who wish to connect hardware to the gpio pins, this app note from TI covers the basics.  While it's written for the MPS430 series of microcontrollers, it applies to the non-5v tolerent pins of the Raspberry Pi as well.<br/> <br/> <URL url="http://focus.ti.com/lit/an/sla.....laa14...
by Blars
Mon Mar 19, 2012 7:52 pm
Forum: HATs and other add-ons
Topic: Gertboard
Replies: 258
Views: 102916

Re: Gertboard

<t>Gert said:<br/> <br/> <br/> ** I could not find any GPL example saying: "No copyright at all. Do with this code what you like, just don't restrict it. You don't even have to keep my name in the code and please don't contact me if you want to have anything changed (or not)."   I assume you first h...
by Blars
Fri Mar 16, 2012 5:11 pm
Forum: Off topic discussion
Topic: Ordered something else to fill the time
Replies: 65
Views: 13977

Re: Ordered something else to fill the time

<t>nmcc said: <br/> <br/> <br/> meltwater said:<br/> <br/> <br/> Personally I got a TI LaunchPad which is a little electronics dev board ($5), that has been great for getting back into the basics of electronics and wiring things to GPIO pins.<br/> <br/> <br/> I was going to order one of these from F...
by Blars
Tue Mar 13, 2012 12:16 am
Forum: Off topic discussion
Topic: What ARM devices do you have already?
Replies: 32
Views: 6786

Re: What ARM devices do you have already?

stm32f4-discovery that I havn't used for anything yet.  It may wind up as a USB interface extender for my R-pi.
by Blars
Tue Mar 13, 2012 12:05 am
Forum: General discussion
Topic: Infrared input connector and disk acess
Replies: 8
Views: 4290

Re: Infrared input connector and disk acess

Less than $5 worth of parts could be used with a couple of gpio pins to make a lirc interface, or you could buy a usb ir toy for $20: http://www.seeedstudio.com/dep.....?cPath=174
by Blars
Mon Jan 02, 2012 4:41 am
Forum: Other projects
Topic: GPIO -> Multiple Serial Ports (UART)
Replies: 25
Views: 52311

Re: GPIO -> Multiple Serial Ports (UART)

The gert board has a pic chip that almost certainly has a hardware uart or two.  That would be cheaper than the overpriced maxim chips.  usb-serial boards are cheap too.
by Blars
Sat Dec 31, 2011 4:29 pm
Forum: General discussion
Topic: Can i use raspberry pi mainly for web browsing?
Replies: 62
Views: 23792

Re: Can i use raspberry pi mainly for web browsing?

<t>kuba said: <br/> <br/> The best part of it: you can omit apt manager and just extract deb file to proper directory with ar program and then run preinst and postinst scripts from control file.<br/> Why?  If you want to do the downloads manually, why don't you just use dpkg to do the install for yo...
by Blars
Sat Dec 31, 2011 3:25 am
Forum: General discussion
Topic: mini perl
Replies: 6
Views: 2105

Re: mini perl

It runs Debian, and Debian uses perl quite a bit in many places.  You can't install debian without perl, but many of the standard perl libraries arn't installed unless needed.  (If you install anything other than a minimal debian, you probably wind up with the perl libraries.)
by Blars
Mon Dec 26, 2011 1:20 am
Forum: Other projects
Topic: In-car entertainment system
Replies: 20
Views: 8648

Re: In-car entertainment system

TI makes some switcher chips that are designed to output 5v from a car battery even when cranking, they switch from buck to boost mode as needed.
by Blars
Fri Dec 23, 2011 2:58 am
Forum: Other projects
Topic: Using a raspberry pi to program AVR chips
Replies: 9
Views: 3677

Re: Using a raspberry pi to program AVR chips

With USBasp programmers availalbe for $5 on ebay, there does not seem to be much demand for making a cheaper programmer.
by Blars
Fri Dec 16, 2011 3:46 pm
Forum: Other projects
Topic: Smart Harddrive (with Raspi in) But need help
Replies: 13
Views: 4211

Re: Smart Harddrive (with Raspi in) But need help

<t>It sounds like the easiest/cheapest solution for you would just to carry multiple CF cards. At least CF did not make the same mistake as ide and SD and build in a tiny max size. Can you still get 1.8" drives? I'm using CF with an adapter in this laptop since I could not find a resonably priced 1....
by Blars
Mon Dec 12, 2011 4:56 pm
Forum: General discussion
Topic: Linaro
Replies: 14
Views: 5728

Re: Linaro

<t>Quote from hstubbs3 on December 11, 2011, 08:06<br/> Even if Ubuntu is explicitly targeting ARMv7, shouldn't it be possible to port it down to ARMv6 ? like automated assembly conversion for the additional instructions? or emulation for them??<br/> All you would really need to do is recompile ever...
by Blars
Wed Dec 07, 2011 3:19 pm
Forum: General discussion
Topic: News articles and blog posts about Raspberry Pi
Replies: 1021
Views: 196179

Re: News articles and blog posts about Raspberry Pi

It doesn't look like it's been mentioned here yet, but the pcb made the Dangerous Prototypes blog:
http://dangerousprototypes.com.....y-pi-pcbs/
by Blars
Sat Dec 03, 2011 4:14 am
Forum: Off topic discussion
Topic: How many here actually *care* about the goals of the project?
Replies: 147
Views: 22988

Re: How many here actually *care* about the goals of the project?

<t>While I'll admit to being interested mainly for my own projects, I think you are underestimating the usefulness of linux and hardware geeks hacking on them. As a Debian Developer, I'm more interested in the DFSG (Debian Free Software Guidlines) than what RMS thinks. (Debian considers GFDL non-fre...
by Blars
Sat Dec 03, 2011 3:48 am
Forum: Off topic discussion
Topic: usb hub and ps2 keyboard/mouse converter
Replies: 6
Views: 2013

Re: usb hub and ps2 keyboard/mouse converter

Quote from pazza on December 2, 2011, 10:54
What about this one:

That's just a non-powered hub, it doesn't have the ps2 keyboard/mouse connections Iliked on the other one.

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