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by hzrnbgy
Thu Apr 12, 2012 11:36 am
Forum: Staffroom, classroom and projects
Topic: Why Pi when you can just run Linux?
Replies: 98
Views: 22593

Re: Why Pi when you can just run Linux?

And they would allow an RPi to boot from an SDcard?


The Pi could prove to be more reliable because it's easier to generate new SD images

by hzrnbgy
Thu Apr 12, 2012 10:10 am
Forum: General discussion
Topic: R-Pi Python with Numpy & Scipy
Replies: 29
Views: 11422

Re: R-Pi Python with Numpy & Scipy

<r>How about a $15 STM32F4 board<br/> <br/> Cortex-M4<br/> <br/> 1MB flash<br/> <br/> 168MHz<br/> <br/> 192KB SRAM<br/> <br/> built in accelerometer, digital MIC, audio out, audio DAC, motion sensor<br/> <br/> ethernetMAC<br/> <br/> SWD (debug)<br/> <br/> 15 timers<br/> <br/> 5 USART (LIN, RS485, Ir...
by hzrnbgy
Thu Apr 12, 2012 2:27 am
Forum: Staffroom, classroom and projects
Topic: Why Pi when you can just run Linux?
Replies: 98
Views: 22593

Re: Why Pi when you can just run Linux?

<t><br/> One comment I got from a school technician was that most of the time the PCs weren't working because the kids* had broken them and it took for ever to get them re-imaged.<br/> <br/> The Pi could prove to be more reliable because it's easier to generate new SD images<br/> <br/> <br/> Nothing...
by hzrnbgy
Mon Apr 09, 2012 5:30 am
Forum: Other projects
Topic: 9 axis IMU
Replies: 4
Views: 3629

Re: 9 axis IMU

Spoken like a true geek
by hzrnbgy
Sat Apr 07, 2012 3:53 pm
Forum: General discussion
Topic: SD Card Benchmarks
Replies: 301
Views: 299327

Re: SD Card Benchmarks

<t>I was just testing some class 4 PNY 8GB SDHC cards on my Pandaboard with Ubuntu Netbook image and I'm sad to report that usability is almost non-existent.<br/> <br/> People clamoring on running a desktop environment on RPi (which is probably twice as slower than a Pandaboard) might experience the...
by hzrnbgy
Thu Apr 05, 2012 6:51 pm
Forum: Other projects
Topic: I searched for the Rasberry Pi's broadcom chip in digikey mouser and broadcom where is its datasheet? Where can it be purchased?
Replies: 16
Views: 3293

Re: I searched for the Rasberry Pi's broadcom chip in digikey mouser and broadcom where is its datasheet? Where can it be purchased?

<r>josheeg said: <br/> <br/> <br/> So I should look at something like the beagle bone since looking for a arm 11 and gpu would be a lot of work. The documentation and chips are avalable also.<br/> <br/> <br/> go with this. a lot better to start with when learning how to program embedded systems. the...
by hzrnbgy
Wed Apr 04, 2012 12:53 am
Forum: Staffroom, classroom and projects
Topic: ARM Assembly / Operating System
Replies: 48
Views: 17527

Re: ARM Assembly / Operating System

<t>David_H said: <br/> <br/> <br/> "For a starter developing an OS, you might want to start small. The Broadcom SoC is fairly complex. Might I suggest starting with a fairly simple 8-bit MCU, just enough to get you started with the basics of OS development" This is very true and a very good point......
by hzrnbgy
Tue Apr 03, 2012 2:43 pm
Forum: Other projects
Topic: Cycle computer
Replies: 7
Views: 5449

Re: Cycle computer

my gps module consumes about 100ma during tracking.
by hzrnbgy
Tue Apr 03, 2012 6:12 am
Forum: General discussion
Topic: PCB and assembly
Replies: 23
Views: 5500

Re: PCB and assembly

I've used iteadstudio.com prototyping services.

Just takes a while to ship it back in the states
by hzrnbgy
Tue Apr 03, 2012 6:07 am
Forum: Other projects
Topic: Deltaboard: a small AVR-based expansion board for the Pi
Replies: 11
Views: 4202

Re: Deltaboard: a small AVR-based expansion board for the Pi

<t>I also built a GPS add-on for the Pi using an xmega32 but my application is very specialized (a car PC).<br/> <br/> Since you have a pretty beefy MCU, how about including a bunch of peripherals on board so users don't need to have flying wires all over the place.<br/> <br/> Good additions would b...
by hzrnbgy
Tue Apr 03, 2012 5:53 am
Forum: Other projects
Topic: Raspy Juice Expansion Board:
Replies: 24
Views: 11007

Re: Raspy Juice Expansion Board:

<t><br/> Maybe I'm missing something obvious, but is there really a need for an RTC?<br/> <br/> So it gets time from the interweb when its connected at boot time, and regularly after that via the most excellent NTP service, but how many people are going to use them completely off-net as an embedded ...
by hzrnbgy
Mon Apr 02, 2012 7:09 am
Forum: Other projects
Topic: Raspy Juice Expansion Board:
Replies: 24
Views: 11007

Re: Raspy Juice Expansion Board:

<t><br/> Juice's RTC is so new that the driver probably isn't in the upstream kernels yet. Looks like Juice will remain a prototype for a long,long time until until the PCF8523 driver becomes prevalent in the distribution<br/> <br/> <br/> Just use an MCU for now (Arduino/AVR/PIC/Cortex etc), build t...
by hzrnbgy
Sat Mar 31, 2012 4:40 am
Forum: Staffroom, classroom and projects
Topic: ARM Assembly / Operating System
Replies: 48
Views: 17527

Re: ARM Assembly / Operating System

For a starter developing an OS, you might want to start small. The Broadcom SoC is fairly complex. Might I suggest starting with a fairly simple 8-bit MCU, just enough to get you started with the basics of OS development
by hzrnbgy
Fri Mar 30, 2012 1:19 pm
Forum: Other projects
Topic: Raspy Juice Expansion Board:
Replies: 24
Views: 11007

Re: Raspy Juice Expansion Board:

Mattylad said:


they don't have to get CE tested and none are actually available yet


I had one prototyped ages ago. Good thing is, it has a built in MCU so RPi not required. Its a GPS add-on board.

by hzrnbgy
Thu Mar 29, 2012 2:17 pm
Forum: General discussion
Topic: Screen tearing?
Replies: 12
Views: 4733

Re: Screen tearing?

enable V-sync in your application or game. You can do this on most DirectX games (windows) but im not quite sure how to do it in Linux
by hzrnbgy
Sat Mar 24, 2012 3:21 pm
Forum: Other projects
Topic: Solar powered httpd server
Replies: 8
Views: 2135

Re: Solar powered httpd server

<t>I concur. Cost saved from using solar power is almost non-existent compared to the initial investment (unless you want to run your RPi for ten decades just to capture the initial investment).<br/> <br/> Maybe at certain scenarios where there is no readily available power source (like in the middl...
by hzrnbgy
Sat Mar 24, 2012 12:58 pm
Forum: Other projects
Topic: Pi-Copter
Replies: 9
Views: 8187

Re: Pi-Copter

<t>I wouldn't want an RPi in my quadcopter. Linux doesn't really provide me enough control of the hardware as oppose to having bare-metal code in an AVR or ARM cortex controller. And for $35/$25, I'd rather have those cheap STM32F4 or LPC xpresso boards with enough peripherals to do realtime control...
by hzrnbgy
Sat Mar 24, 2012 10:05 am
Forum: Other projects
Topic: Pi-Copter
Replies: 9
Views: 8187

Re: Pi-Copter

<t>Iv'e been meaning on a project like these but somehow can't get myself to spend $400 for a good complete quadcopter frame. I have experienced with electronics and programming (AVR, Cortex-M3, OpenCV) so I'm covered on that.<br/> <br/> It's just that the entry point for some good quadcopter hardwa...
by hzrnbgy
Sat Mar 24, 2012 9:38 am
Forum: General discussion
Topic: R-Pi Python with Numpy & Scipy
Replies: 29
Views: 11422

Re: R-Pi Python with Numpy & Scipy

<t><br/> Remember the device is to teach programming, not to provide hardware hackers with lots of GPIO, ADC, PICs etc. You may be better off with Arduino if that is the bag you are into.<br/> <br/> <br/> wouldn't be a lot cooler if the kids get to learn how to program something that crosses the vir...
by hzrnbgy
Tue Mar 20, 2012 1:40 pm
Forum: General discussion
Topic: Potential power source
Replies: 83
Views: 14161

Re: Potential power source

if you fancy a bit of soldering, here are some good switchmode power supplies

http://www.mouser.com/Power/Pl.....k=P_MarCom
by hzrnbgy
Tue Mar 20, 2012 1:13 pm
Forum: Other projects
Topic: Wireless data aquisition
Replies: 11
Views: 3094

Re: Wireless data aquisition

<t>rew said: <br/> <br/> <br/> Techno,<br/> <br/> Getting analog readings is something an AVR or PIC can do just as well as the Raspberry pi. However, sending these using WIFI to somewhere else is something that the RPi is much better at. Connecting an USB wireless module is easy on the 'Pi, and ver...
by hzrnbgy
Tue Mar 20, 2012 2:36 am
Forum: Other projects
Topic: Wireless data aquisition
Replies: 11
Views: 3094

Re: Wireless data aquisition

<t>for an application you are describing, the RPi would be more suitable as the brain of the system. The RPi is way too powerful and expensive for such a simple task of periodically taking reading from a sensor and transmitting it wirelessly.<br/> <br/> The RPi could be the master aggregating all th...
by hzrnbgy
Tue Mar 20, 2012 2:24 am
Forum: General discussion
Topic: Why so power hungry?
Replies: 22
Views: 6402

Re: Why so power hungry?

<t>I have been contemplating the idea of running my own bare-metal application on a Pi but the availability of a real datasheet and a debugger/programming port somehow makes it more of a pipe dream.<br/> <br/> Im sure the Broadcom chip supports deep power-down modes just like every other ARM cpu but...
by hzrnbgy
Sun Mar 18, 2012 4:10 pm
Forum: Other projects
Topic: off grid media player /web access
Replies: 3
Views: 1671

Re: off grid media player /web access

don't forget an ultra efficient switching regulator to drop the 12V to what the RPi needs

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