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Geektox posted:Where's the best place to buy these from in Canada? It seems all the retailers on the official site ship from the US and it'd be lame to get nailed on Customs fees. Aha! http://www.abra-electronics.com/ ships from Montreal. I spent hours earlier this week trying to find a Canadian reseller so I could try my first pi.
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Feb 28, 2013 09:48
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Geektox posted:Vancouver Lee's Electronics on Main is selling them for $45
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Feb 28, 2013 16:20
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I got mine from Newark/Element 14, they didn't charge me customs. Mind you, I ordered a case and the Pi, and they came in separate shipments (and only charged me once for shipping), and the Pi was backordered by a week
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Feb 28, 2013 19:58
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Thanks guys, I'll probably get them from Lee's. Another question. Despite the title, is this actually a good computer for a kid? My little brother (8 y/o) requested Mindstorms as his birthday present, and he'll probably need a computer to code the thing on. Looks like the NXT is usable with pretty much any language, and it might be fun for him to learn a little python at the same time (if he has interest). I get that the RPi is pretty garbage for anything like browsing, but it seems to me that for a kid that might be a plus, as it would prevent me from having to protect him from the big bad internet.
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Feb 28, 2013 23:39
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I would have loving gone nuts over this thing when I was an 8 year old, C64, lego building nerd.
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Mar 1, 2013 00:44
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I don't have any first-hand experience but that's the RPi Foundation's target audience.
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Mar 1, 2013 00:45
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Geektox posted:Thanks guys, I'll probably get them from Lee's. Have a look through the manual, if you haven't already http://www.raspberrypi.org/archives/2965 It seems pretty decent at actually bringing in programming concepts and getting kids used to the whole way of thinking. And it looks pretty fun  It has a section on Python too which is more advanced but it's probably what you're looking for. And at a guess, if no Mindstorms libraries exist yet then they will in the near future - people love bringing capabilities to the Pi
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Mar 1, 2013 14:48
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https://www.sparkfun.com/products/11712 New Raspberry Pi-style board computer from SparkFun. Looks like it has some of the GPIO features that the Pi is lacking in (PWM, pin compatibility with Arduino shields), for $60. Not bad considering a genuine Arduino costs about $30, and it cuts down on a board for those projects that need an Arduino and a Pi.
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Mar 1, 2013 18:40
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TVarmy posted:https://www.sparkfun.com/products/11712 Also, it uses a Cortex A8, which is a better SoC and should support more operating systems out-of-the-box. I'm wondering what will happen when the new ARMv8 SoCs become available next year. A device like the Pi that has a 64-bit instruction set could have an interesting impact in the scientific research field, especially for university students
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Mar 1, 2013 20:09
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TVarmy posted:https://www.sparkfun.com/products/11712 Ohh, that looks interesting. I wonder what runs on it? Someone mentioned Debian is working on a port and Android ICS already works. I wonder about RiscOS?
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Mar 2, 2013 01:15
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Yeah, if it can get half the community of the RPi, I might just buy one, even though I already have a teensy, some digisparks, an arduino, and some bare Atmegas to give any pi plenty of capabilities. This, plus the new BeagleBone, makes me think the Pi is ushering in a whole new class of hobbyist board. VVVVV Didn't notice that. I thought the board was out somewhere. Seems kind of crappy to not have one ready, since it sounds like a simple PCB to make... TVarmy fucked around with this message at 01:40 on Mar 2, 2013 |
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Mar 2, 2013 01:19
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Haha, wait, that thing isn't Arduino shield compatible... They're "planning" to "release" an "add-on board" that "makes it pin compatible" in the "coming months".
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Mar 2, 2013 01:25
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So I've been doing some RFID installs lately, and it struck me that instead of paying HID a ton of money for controllers and such, on interior doors I could use a cheap, microcontroller based thing with Ethernet...or, a $25 Rasp Pi. So I guess question is, what are the GPIO interrupts like / determinism on the Pi? It's a standard Wiegand interface, so I'll have two lines I need to sample. I figure I can write my own kernel-space driver or something to improve performance if needed. I figure worst-case, I'll build a really tiny ATTiny or similar device to do the Wiegand interface, and act as a I2C slave (and run a pin to the GPIO to serve as an INT line). Pi inputs aren't 5V tolerant either 
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Mar 2, 2013 05:26
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movax posted:So I've been doing some RFID installs lately, and it struck me that instead of paying HID a ton of money for controllers and such, on interior doors I could use a cheap, microcontroller based thing with Ethernet...or, a $25 Rasp Pi. Why not use a Teensy + WIZ812? Teensy 2 uses an Atmel while the new 3 actually has an ARM onboard. Lots of IO to mess with on those and they're cheap ($16!) I suppose you could do it on the RPi though. If you're running Linux you're not going to get true realtime control of the GPIO though, if that's what you're after. For what it's worth though you could install RiscOS and code it in ASM.
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Mar 2, 2013 06:28
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Quick OpenELEC question: When XBMC scans a folder and downloads metadata for, say, movies or whatever; does said metadata/artwork etc get stored on the drive which contains the files, or on the SD card that OpenELEC boots from?
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Mar 2, 2013 15:41
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moron posted:Quick OpenELEC question: SD card. Thumbnails and posters are locally stored.
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Mar 2, 2013 17:35
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YouTuber posted:SD card. Thumbnails and posters are locally stored. You should see a folder/file in the root directory you indicated when you selected the media.
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Mar 3, 2013 06:29
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After 4 days of fiddling, coding, more fiddling, banging my head against the wall and yet more coding and fiddling, I've got a new display setup and working with my RPi:  It's a hacked Kindle running Debian Sid + Xephyr, connected to the RPi over an SSH tunnel with Xauth forwarding. Launch any X app from the RPi's CLI and it displays on the Kindle Paperwhite's awesome e-ink display. This will make an awesome debug console while I experiment with GPIO.
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Mar 5, 2013 07:04
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Anyone have any ideas for a lightweight remote media server (a la Audiogalaxy, Subsonic, etc) on the RPi? I tried Subsonic, but the process was taking all of the memory on the RPi and the web access was pretty slow. I just want to stream all my music from my hard drive at home onto my phone (or other computers). There might be a janky FTP method of doing it but Audiogalaxy and Subsonic both work so well that I would like a similar solution.
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Mar 6, 2013 14:40
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I am interested in messing around with the gpio pins. But I need to know one thing first. If you screw up the voltage and accidentally send five volts, would I have to buy a new pi?
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Mar 7, 2013 01:05
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keyvin posted:I am interested in messing around with the gpio pins. But I need to know one thing first. If you screw up the voltage and accidentally send five volts, would I have to buy a new pi? They aren't 5V tolerant. So they'll probably be damaged by such a mistake. If you only expose them for a short time, or by a low current source, it is possible that they may not be damaged but this is not at all guaranteed. Exactly what will happen will depend on the state of the pins, the exact physical construction and layout of the chip, and other such details. Even if you experiment and find an overvoltage setup that works for your purposes, this kind of damage is often cumulative, so just because it works now, doesn't mean it will stay working. The good news is that the damage is often limited to the GPIO pin you expose, rather than the entire chip.
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Mar 7, 2013 05:39
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The future home of my Pi, external HDD, powered USB hub, some LCD panels, and a roll up keyboard:  I'm going to be sectioning off the space inside using steel plate welded on, with slots for cords. The Pi itself is going to be held in a smaller case that'll pop in and out of place, in case I need to pull it our for whatever reason. I'm also working on making it have a single power cord, with everything on the inside powered off of a small powerbar.
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Mar 7, 2013 08:39
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I swear that half the fun of these things is in the case. I wish I made my own to make it look like a deck of playing cards rather than just getting a Pibow case.
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Mar 7, 2013 18:53
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Just ordered my Pi after finding a hdmi 7 inch screen in the free bin at work. I'm planning on building a emulator box with it and a spare cheapo SNES style usb controller. Anybody had any succes with this? I was also conisering making a harness from the gpio to an arcade surface but USB seems simpler to start out. Just saw this which looks pretty cool. http://www.kickstarter.com/projects/pimoroni/picade-the-arcade-cabinet-kit-for-your-raspberry-p I figure that cabinet would be easily built out of masonite but i wish that somebody sold a wiring harness for the controls.
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Mar 7, 2013 20:48
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Gunga-Din posted:Just ordered my Pi after finding a hdmi 7 inch screen in the free bin at work. where do you work???
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Mar 7, 2013 23:49
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HATE TROLL TIM posted:Why not use a Teensy + WIZ812? Yeah, I think I'm going to end up doing a PIC18 as an I2C slave. The PIC18's 5V tolerant, so I don't have to add any interface circuitry and it should get me up and running pretty quick I think. I'll just run one output to the RPi to serve as an alert that it should read data from the PIC via I2C, and IRQ off that. I thought about doing it 100% embedded, but I don't have the time to really engineer the system / validate its functionality, and even though this door is not the most important in the world, I'd feel really lazy doing authentication without SSL/TLS, and apparently the Microchip TCP/IP stack's implementation is woefully out of date. Though I did discover they make a big brother to the ENC28J60 w/ hardware crypto, which is cool.
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Mar 7, 2013 23:56
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Does anyone know of any Pi cases that can be cut on a CNC instead of a laser? (ie, no right-angle interior corners).
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Mar 8, 2013 18:16
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Mill Town posted:Does anyone know of any Pi cases that can be cut on a CNC instead of a laser? (ie, no right-angle interior corners). This case is all just flat pieces http://www.thingiverse.com/thing:24461 It snaps together easily and looks pretty nice.
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Mar 8, 2013 20:16
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I have that case, and it's pretty nice, but feels a little flimsy. It definitely feels better once you have some cables plugged into it.
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Mar 8, 2013 20:36
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DNova posted:where do you work??? Ah the joys of film production, can't set focus on a screen like that so it is mine to keep.
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Mar 8, 2013 23:03
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KrautHedge posted:This case is all just flat pieces http://www.thingiverse.com/thing:24461 Nnnnnnnnnope, that one has lots of 90 degree interior corners.
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Mar 9, 2013 06:39
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movax posted:So I guess question is, what are the GPIO interrupts like / determinism on the Pi? It's a standard Wiegand interface, so I'll have two lines I need to sample. I figure I can write my own kernel-space driver or something to improve performance if needed. Same main chip as the Cubieboard I've got, bit less capable in the I/O department. (I really need to put that to use doing something...) As well as the extra GPIO and ADC functionality and a more modern CPU, they have a native Ethernet controller and a USB controller that's standard EHCI like on your desktop rather than the buggy, CPU-gobbling Synopsis PoS that the Pi's sadly lumbered with. I believe that board also comes with an OS image in the onboard flash that should make it plug-and-play. The available documentation and community support for all these boards is rather pitiful compared to the Pi though. Note that unlike the Pi or Cubieboard, the pcDuino has no analog audio output. I've no idea why; the Allwinner A10 has all the necessary hardware, all they needed to do was connect it up.
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Mar 9, 2013 20:41
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You can always get a $7 USB audio dongle on Amazon. I wonder if anyone has ever tried writing a software sound card that outputs over the PWM pins?
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Mar 9, 2013 21:33
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HATE TROLL TIM posted:You can always get a $7 USB audio dongle on Amazon. I wonder if anyone has ever tried writing a software sound card that outputs over the PWM pins? That would sound awful, they're all digital so it's either on or off. You could probably get some different beeps out of it but eh.
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Mar 10, 2013 04:26
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Shadaez posted:That would sound awful, they're all digital so it's either on or off. You could probably get some different beeps out of it but eh. It's totally possible to get good sound from binary outputs. A class D amplifier is basically a PWM.
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Mar 10, 2013 04:48
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Shadaez posted:That would sound awful, they're all digital so it's either on or off. You could probably get some different beeps out of it but eh.
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Mar 10, 2013 13:23
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So no one completely dismisses the RPi audio-out as crap and buys a USB dongle before even trying it: I have had no problem with the quality while using it as a throw-around AirTunes location in the garage. It pops a litte when first initialized, but then the music is fine, though probably not "audiophile."
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Mar 10, 2013 16:47
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eddiewalker posted:So no one completely dismisses the RPi audio-out as crap and buys a USB dongle before even trying it: I have had no problem with the quality while using it as a throw-around AirTunes location in the garage. It pops a litte when first initialized, but then the music is fine, though probably not "audiophile." There is apparently a trick using Pulse Audio instead of Alsa and configuring Pulse Audio to never go to sleep. The pops come when you turn on/off the sound card. Didn't bother, as I just use mine to play music as an alarm clock/read the time, so a pop here and there don't bother me. Re: Sound quality: I agree. Playing it on a $10 pair of tiny speakers from amazon, it does the job. I wouldn't have it be my media center's main audio source, but for that, people tend to use HDMI, so what's the problem, really? It's good enough for cheap applications, and easily replaced (with USB or HDMI) for other applications. TVarmy fucked around with this message at 17:14 on Mar 10, 2013 |
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Mar 10, 2013 17:00
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Okay, can someone clarify GPIO voltage tolerance for me? I keep seeing people say the GPIO is 3v3 only and to never, ever hook 5v up to it or it'll explode. That completely contradicts my experience with it so far. I picked up a cheap USB to TTL UART adapter from Amazon, based on the PL2303HX chipset. (Side Note: For $6 it's really nice. Came with a loopback jumper and two sets of leads [M/F+M/M], plus it has 5v and 3v3 outputs for powering small circuits directly!) I've been using it to console into the RPi for the last week and it's worked flawlessly. I happened to have my multimeter out last night so I decided to see what voltage was going across the TX and RX pins. Adapter TX --> RPi RX = 5v RPi TX --> Adapter RX = 3.3v That got me thinking, so I pulled out an old SR-04 ultrasonic distance module I've had, but never tried to use with the RPi because the echo pin outputs 5v and I didn't think it would work. Wired it up (with a 1k resistor between the echo (output) and GPIO pin to be safe), wrote some quick Python code and it works fine! So it seems to me the GPIO can handle 5v just fine. Am I missing something?
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Mar 10, 2013 20:54
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HATE TROLL TIM posted:Okay, can someone clarify GPIO voltage tolerance for me? I keep seeing people say the GPIO is 3v3 only and to never, ever hook 5v up to it or it'll explode. That completely contradicts my experience with it so far. No. 5v is what the thing runs off of, and unless the gpio pins are tied directly into the CPU (more than likely 3.3v) You will be fine connecting a 5v source to the pi. I would look at the schematics though to make sure you aren't doing anything stupid like plugging a 5v power source into a 3.3 pin.
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Mar 10, 2013 21:03
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