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by error404
Fri Jan 06, 2012 11:28 pm
Forum: HATs and other add-ons
Topic: simple 16 signal GPIO I2C board
Replies: 31
Views: 19642

Re: simple 16 signal GPIO I2C board

<t>Nice. KISS. I like it. And there is already a driver in-tree for PCA9555, so all you need to make it work is an i2c bus driver for the BCM2835.<br/> <br/> My only suggestion is that this seems to be designed for use on a breadboard without soldering anything, so perhaps it is worth using headers ...
by error404
Fri Jan 06, 2012 11:13 pm
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 53783

Re: Easy GPIO Hardware & Software

<t>meltwater said: <br/> <br/> Yeah that is a fair point, for this initial circuit I'm thinking basic resistive based sensors, such as light dependent resistors, thermistors, moisture etc. Things like wheatstone bridges, signal amplifiers and such like can be explored later. A separate circuit for s...
by error404
Fri Jan 06, 2012 11:35 am
Forum: Other projects
Topic: Possible bluetooth connectivity
Replies: 7
Views: 2913

Re: Possible bluetooth connectivity

<t>Bluetooth dongles will definitely work. One thing they did very right was specify the hardware interface as well, so all Bluetooth dongles use the same hardware interface, and thus the same driver. I'm not sure that the team will be building the Bluetooth stuff into the kernel they ship, but wors...
by error404
Fri Jan 06, 2012 11:28 am
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 53783

Re: Easy GPIO Hardware & Software

<r>meltwater said: <br/> <br/> - Circuit 4 [Analogue sensor to digital input] -<br/> For most cases the simple circuit I think would be enough, perhaps we can create a more complex one later on using comparators (for specific applications).  Perhaps most would find themselves better off using the Ge...
by error404
Fri Jan 06, 2012 10:51 am
Forum: General discussion
Topic: Battery power
Replies: 68
Views: 25108

Re: Battery power

<t>Jongoleur said: <br/> <br/>  In many ways, a battery setup would be preferable to a cheaper 5v USB power adaptor as they can and do crap out, frying anything connected to them!<br/> This is actually a very good point I hadn't thought much about. I've seen USB wall warts that aren't even isolated ...
by error404
Fri Jan 06, 2012 6:15 am
Forum: Other projects
Topic: DMX controller for LED architectural lighting
Replies: 25
Views: 17887

Re: DMX controller for LED architectural lighting

<t>In this particular case, it looks like they are using the FTDI USB->serial chip to communicate with their board, which is supported in the main kernel tree, and as it's a pretty popular chip, the module stands a good chance of shipping with the Pi.<br/> <br/> However, their MagicQ software seems ...
by error404
Fri Jan 06, 2012 12:50 am
Forum: Other projects
Topic: POE on the Raspberry Pi
Replies: 9
Views: 12939

Re: POE on the Raspberry Pi

<t>That TP-link stuff is actually a pretty good price for 802.3af compliant gear. I hadn't seen that last time I looked. $50/port is still pretty steep for someone just fooling around, but it's not bad either and I doubt the community could do much/any better on the cost front. They also have a $60 ...
by error404
Thu Jan 05, 2012 8:50 pm
Forum: General discussion
Topic: Programms have to be rewritten?
Replies: 6
Views: 2560

Re: Programms have to be rewritten?

<t>Many emulators use extensive assembly optimization, including ZSNES. It depends on nasm and the x86 architecture, and I don't think that dependency will be (too) easily broken, I don't think it's happened yet.<br/> <br/> bsnes will certainly work, but is relatively slow as it aims for accuracy, s...
by error404
Thu Jan 05, 2012 8:21 pm
Forum: Other projects
Topic: POE on the Raspberry Pi
Replies: 9
Views: 12939

Re: POE on the Raspberry Pi

<t>802.3af requires some intelligence and negotiation with the PSE. I'm not sure how difficult that would be to reconcile with passive PoE schemes on the same device. Might be possible, would be interesting. However I think the demand for 802.3af would only be among institutional (ie. education) use...
by error404
Thu Jan 05, 2012 8:13 pm
Forum: General discussion
Topic: Battery power
Replies: 68
Views: 25108

Re: Battery power

Perhaps your definition of 'horrendous' doesn't match other users'. I don't think too much power consumption information is available yet, but I would guess at an idle consumption under 1W for the MPU. That's 200mA at 5V, giving you over 10 hours on your AAs.
by error404
Thu Jan 05, 2012 8:05 pm
Forum: General discussion
Topic: Easy GPIO Hardware & Software
Replies: 133
Views: 53783

Re: Easy GPIO Hardware & Software

<t>Do you intend 'basic' as 'least parts and as simple as possible' or 'minimal good implementation'?<br/> <br/> 1. This is okay, but low-side switching will provide more voltage to drive high-brightness LEDs and makes resistor calculation 'simpler' since the switching device won't contribute much v...
by error404
Thu Jan 05, 2012 6:46 pm
Forum: General discussion
Topic: How come there are so many Raspberry Pi haters?
Replies: 99
Views: 28175

Re: How come there are so many Raspberry Pi haters?

<t>JamesH said:<br/> <br/> <br/> Well, I'm not sure why you think my post was unhelpful bearing in mind in contained much of the information you were looking for. If you are so well informed and have read the forums, why did you not know that the OpenGL libs are included, the OpenVG libraries are in...
by error404
Thu Jan 05, 2012 4:35 am
Forum: General discussion
Topic: BCM2835 Questions
Replies: 31
Views: 11326

Re: BCM2835 Questions

<t>1) You can't, and probably won't ever be able to, unless of course you have an existing relationship with Broadcom.<br/> <br/> 2) Dunno.<br/> <br/> 3) Maybe at some point, but as yet, no.<br/> <br/> 4) Yes, but if you have to ask, you don't want to know the price. It probably has at least 2 more ...
by error404
Thu Jan 05, 2012 4:24 am
Forum: Other projects
Topic: POE on the Raspberry Pi
Replies: 9
Views: 12939

Re: POE on the Raspberry Pi

Real PoE (ie. IEEE802.3af) or passive PoE?
by error404
Thu Jan 05, 2012 2:42 am
Forum: General discussion
Topic: Can Raspberry do the same as the Arduino?
Replies: 5
Views: 2671

Re: Can Raspberry do the same as the Arduino?

<t>lesto said: <br/> <br/> <br/> there are some GPIO, but not as much as arduino and no ADC.<br/> <br/> And probabily a rasperry is an overkill for what you need to do <br/> <br/> <br/> <br/> If he wants to actually run a decent soft-synth on the same machine (and not just provide a MIDI OUT port) I...
by error404
Thu Jan 05, 2012 12:58 am
Forum: General discussion
Topic: How come there are so many Raspberry Pi haters?
Replies: 99
Views: 28175

Re: How come there are so many Raspberry Pi haters?

<t>James, yours is exactly the sort of unhelpful, overly defensive and hostile post that I'm referring to. You are also quite mistaken, as I'm quite well informed about your position on these issues, having read all that I could find on them on the forums and website.<br/> <br/> I am in this thread ...
by error404
Wed Jan 04, 2012 7:54 pm
Forum: General discussion
Topic: How come there are so many Raspberry Pi haters?
Replies: 99
Views: 28175

Re: How come there are so many Raspberry Pi haters?

<t>Prometheus said: <br/> <br/> Um, pardon me, but could you point to where the Foundation has seemed openly hostile to deep understanding of the hardware?<br/> <br/> First of all, the responses to people asking about releasing schematics and PCB layouts - which are obviously finalized at this point...
by error404
Wed Jan 04, 2012 6:49 pm
Forum: General discussion
Topic: How come there are so many Raspberry Pi haters?
Replies: 99
Views: 28175

Re: How come there are so many Raspberry Pi haters?

<t>tufty said: <br/> <br/> <br/> There is no hostility to open source visible from Broadcom.<br/> <br/> <br/> This was not really the thrust of my post. It is undeniable that Broadcom has not historically released public documentation for their SoCs, nor have they (to my knowledge) allowed such docu...
by error404
Wed Jan 04, 2012 6:26 pm
Forum: General discussion
Topic: How come there are so many Raspberry Pi haters?
Replies: 99
Views: 28175

Re: How come there are so many Raspberry Pi haters?

<t>bbramble said: <br/> <br/> <br/> The possibilities are limited only by imagination, and maybe that is why some don't see the point.<br/> <br/> <br/> <br/> I think some are frustrated that this is not the case, as they are limited by Broadcom's policy of being openly hostile to open-source develop...
by error404
Tue Jan 03, 2012 7:22 pm
Forum: Other projects
Topic: GPIO -> Multiple Serial Ports (UART)
Replies: 25
Views: 59382

Re: GPIO -> Multiple Serial Ports (UART)

<t>The NXP SPI->UART chips are fairly inexpensive, a dual UART (SC16IS752) is about $2.50. Even the DIP version of SC26C92, another dual UART, is about $5.00.<br/> <br/> USB is probably the way to go though, unless you need low latency. It's certainly going to be easier to get going, but you'll end ...
by error404
Tue Jan 03, 2012 6:43 pm
Forum: General discussion
Topic: Audio options...
Replies: 14
Views: 5532

Re: Audio options...

<t>Apparently the SPI peripheral also supports I²S, which most/all CODEC chips support for digital audio data. SPI is apparently broken out on the board, so assuming (big assumption...) that a driver/documentation for this peripheral is provided that supports using it in this mode, you could just ad...
by error404
Fri Dec 23, 2011 6:17 am
Forum: Other projects
Topic: Using a raspberry pi to program AVR chips
Replies: 9
Views: 4540

Re: Using a raspberry pi to program AVR chips

$0 is better than $5, if you already have the RPi. And since it seems like it'd be almost entirely software, it only makes things easier for people to get started with microcontroller programming. This could potentially be useful in the education context that RPi is designed for.
by error404
Thu Dec 22, 2011 4:06 am
Forum: General discussion
Topic: Confused about GPU
Replies: 21
Views: 5390

Re: Confused about GPU

<t>I would argue that. Perhaps you are just being overly pedantic, but many applications of embedded systems do not use what would traditionally be considered an OS. Being just like any other CPU, this one operates on a simple principle - fetch instructions from RAM and execute them, and that does n...
by error404
Thu Dec 22, 2011 1:06 am
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 33778

Re: Software Defined Radio

<t>I2S, not I2C. I2S is a serial audio protocol that pretty much any audio DAC/ADC will implement. It is similar to SPI, but is clocked somewhat differently and uses an extra left/right clock for stereo audio, and generally no chip select.<br/> <br/> It is designed specifically for this task, and wo...
by error404
Thu Dec 22, 2011 12:58 am
Forum: Other projects
Topic: Using a raspberry pi to program AVR chips
Replies: 9
Views: 4540

Re: Using a raspberry pi to program AVR chips

<r>Someone knowledgeable should answer this, but now I tend to think the programmer just pulls the reset-pin low, then dumps the hex-file on memory address 0x000. Then pulls reset back up.<br/> It's somewhat more complicated than that, there is some command verification, a magic number enable sequen...

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