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by error404
Sat Feb 11, 2012 12:04 am
Forum: Other projects
Topic: Firewall
Replies: 20
Views: 76495

Re: Firewall

<t>First of all, if you're after an actual dedicated firewall, the Raspberry Pi hardware is not very suitable.<br/> <br/> Not many dedicated firewall distributions are likely to build for ARM. Most of them are designed around relatively 'large' systems. OpenWRT is fairly likely to get a port IMO, as...
by error404
Fri Feb 10, 2012 11:51 pm
Forum: General discussion
Topic: Isn't this all too complicated?
Replies: 230
Views: 46522

Re: Isn't this all too complicated?

<t>TheManWhoWas said: <br/> <br/> <br/> That link to the ZX81 manual is fantastic and a salutory reminder of just why us 80's kids were able to teach ourselves to program.<br/> <br/> <br/> Documentation and tools are far more varied and accessible now than they were in the 80s. All that's really nee...
by error404
Fri Feb 10, 2012 9:30 am
Forum: General discussion
Topic: Protect the GPIO
Replies: 6
Views: 1637

Re: Protect the GPIO

<t>rurwin said:<br/> <br/> <br/> Oh dear, I'm sorry to hear that. What sort of time-constant does it use and can it be switched off?<br/> It's all very nice when you're using switches, but it would significantly reduce the bandwidth.<br/> <br/> <br/> <br/> It's actually not strictly part of the GPIO...
by error404
Fri Feb 10, 2012 6:26 am
Forum: General discussion
Topic: Isn't this all too complicated?
Replies: 230
Views: 46522

Re: Isn't this all too complicated?

<t>John Beetem said: <br/> <br/> <br/> I suppose I should be fussy and point out that most RasPi users won"t even see Linux.  They"ll see GNU, which runs on top of the Linux kernel.  Most Android users don"t see their Linux layers either.<br/> <br/> <br/> I doubt that they will even see GNU, if the ...
by error404
Fri Feb 10, 2012 2:24 am
Forum: General discussion
Topic: Protect the GPIO
Replies: 6
Views: 1637

Re: Protect the GPIO

<t>drgeoff said:<br/> <br/> <br/> If you just want a manual switch within a few tens of centimetres of the RP then a 47k pull-up resistor to the 3.3 volt supply and a switch to ground are probably all you need.<br/> <br/> You may need to add some debounce in the software.<br/> <br/> <br/> <br/> Linu...
by error404
Thu Feb 09, 2012 9:10 pm
Forum: Other projects
Topic: Security Camera System
Replies: 83
Views: 117523

Re: Security Camera System

<r>As an alternative to capturing the images/video on the Pis at the camera sites and then sending them to a server, perhaps it makes sense to just use the Pi as a USB host and transfer the entire USB traffic over the interface instead? Might make it easier to integrate with things like ZoneMinder i...
by error404
Thu Feb 09, 2012 8:43 pm
Forum: Other projects
Topic: Rasberry Pi to drive temperature sensor / weather balloon- school project
Replies: 13
Views: 4821

Re: Rasberry Pi to drive temperature sensor / weather balloon- school project

<t>chrishillcox said:<br/> <br/> <br/> Thermal data is a start but it would be any kind of sensor the school project wanted. It could be dust, gasses, temperature, UV or a range at the same time.<br/> <br/> <br/> You're probably going to want some sort of external analog I/O board then. Perhaps a ge...
by error404
Thu Feb 09, 2012 6:48 am
Forum: Other projects
Topic: Suggestion: Tiny PCB for DC-anything to 5 V DC
Replies: 50
Views: 18438

Re: Suggestion: Tiny PCB for DC-anything to 5 V DC

Switchmode regulators are also available that will go into a passthrough mode when the input voltage falls below their dropout voltage.
by error404
Thu Feb 09, 2012 12:52 am
Forum: Other projects
Topic: Rasberry Pi to drive temperature sensor / weather balloon- school project
Replies: 13
Views: 4821

Re: Rasberry Pi to drive temperature sensor / weather balloon- school project

<t>JamesH said: <br/> <br/> <br/> Although, if you want video and stills capture as well, with a camera the Raspi could handle the entire system for you - sensors, data logging, GPS and imaging. Just using a Raspi camera would save a lot of weight over a separate compact - enough to offset the highe...
by error404
Thu Feb 09, 2012 12:25 am
Forum: General discussion
Topic: High definition audio (really high)
Replies: 10
Views: 5580

Re: High definition audio (really high)

<t>Looks like my long post explaining how buffers work was eaten. But basically you don't understand them . Then length of the buffer defines roughly how long the system can be occupied with other tasks without paying attention to supplying audio data, not how long it can play without dropouts. 1s i...
by error404
Wed Feb 08, 2012 11:46 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 34290

Re: Software Defined Radio

<t>Well, most ham SDR gear is designed around the same concept – mixing the RF down to baseband and then sampling it with audio hardware. So the exact SDR rig you choose to use doesn't matter much, they all operate in essentially the same fashion. There might be some complications with regard to how...
by error404
Wed Feb 08, 2012 8:01 pm
Forum: General discussion
Topic: Speed of the GPIO ports? (For electronic fuel injection)
Replies: 22
Views: 12884

Re: Speed of the GPIO ports? (For electronic fuel injection)

<t>rushpro said:<br/> <br/> <br/> First, I understand that Linux is not a real time operating system, if I was to use a linux distro, it would be a custom job stripped right down to just the core(I used to run a gentoo server with a xen based kernel to host virtual machines, configuring a linux kern...
by error404
Wed Feb 08, 2012 7:08 pm
Forum: Other projects
Topic: P2P ISP
Replies: 2
Views: 1288

Re: P2P ISP

<r>There is already cheap hardware out there, with everything including the antenna and WiFi radio integrated in one weatherproof package, and with presumably better networking performance, for this purpose. e.g. the stuff by Ubiquiti <URL url="http://www.ubnt.com/">http://www.ubnt.com/</URL> . Also...
by error404
Wed Feb 08, 2012 6:57 pm
Forum: General discussion
Topic: High definition audio (really high)
Replies: 10
Views: 5580

Re: High definition audio (really high)

<t>Walther said:<br/> <br/> <br/> However, I would like to hear about the support for audio output to usb, bypassing the onboard audio (no re-sampling, evil!).<br/> <br/> <br/> <br/> It's a Linux box. If you have the necessary driver for your USB sound card, and have compiled it for your running ker...
by error404
Wed Feb 08, 2012 6:11 am
Forum: General discussion
Topic: Speed of the GPIO ports? (For electronic fuel injection)
Replies: 22
Views: 12884

Re: Speed of the GPIO ports? (For electronic fuel injection)

<t>You're not really asking the right questions. Raspberry Pi is designed to run Linux. Linux is not a hard realtime operating system. Your application needs hard realtime operation. Yes, the GPIO on Raspberry Pi is probably faster than Arduino, but the GPIO performance of Arduino isn't the limiting...
by error404
Tue Feb 07, 2012 8:24 pm
Forum: Other projects
Topic: Water Meter
Replies: 8
Views: 7032

Re: Water Meter

<t>This is getting off-topic, but given that information I'm curious why my local government has been promoting water conservation for a long time now, including summer sprinkling schedules, financial incentives for installing dual-flush toilets, subsidized rainwater collection and so on. Is this du...
by error404
Tue Feb 07, 2012 8:17 pm
Forum: Other projects
Topic: GPIO -> Multiple Serial Ports (UART)
Replies: 25
Views: 60159

Re: GPIO -> Multiple Serial Ports (UART)

<t>Anyone (and I mean that literally) can do SOIC with basically zero practice. You just need to get over the irrational fear people have of SMD assembly. It's actually much faster and easier once you get the hang of it (no snipping of wires and no turning the board over = parts falling out), especi...
by error404
Tue Feb 07, 2012 8:12 pm
Forum: General discussion
Topic: on the GPIO datasheet
Replies: 4
Views: 1523

Re: on the GPIO datasheet

Are you confusing latency and switching speed or are you intentionally conflating the two?
by error404
Tue Feb 07, 2012 5:57 pm
Forum: Other projects
Topic: GPIO -> Multiple Serial Ports (UART)
Replies: 25
Views: 60159

Re: GPIO -> Multiple Serial Ports (UART)

MCP2200 is cheap, readily available in an easy SOIC package, has been reliable for me, and uses the USB CDC so should be supported everywhere. If you want to build something yourself, anyway. Add a cheap USB hub chip (e.g. TUSB2046) and you could put a few on one board...
by error404
Tue Feb 07, 2012 8:33 am
Forum: General discussion
Topic: New post on the front page: a date that'll interest you, and a datasheet that will too.
Replies: 127
Views: 22061

Re: New post on the front page: a date that'll interest you, and a datasheet that will too.

<t>Jongoleur said: <br/> <br/> <br/> Now I see the reason why Apple don't announce product until they have a warehouse full of gadgets – it keeps the faithful happy, praying at the shrine for new product and not whining because production slipped by a couple of months.<br/> <br/> <br/> Perhaps you s...
by error404
Tue Feb 07, 2012 3:25 am
Forum: General discussion
Topic: New post on the front page: a date that'll interest you, and a datasheet that will too.
Replies: 127
Views: 22061

Re: New post on the front page: a date that'll interest you, and a datasheet that will too.

Curious now about future production - is a board and tooling respin going to be required for full-volume production or has a reliable source for this part in quantity been secured?
by error404
Mon Feb 06, 2012 11:59 pm
Forum: Other projects
Topic: Rasberry Pi to drive temperature sensor / weather balloon- school project
Replies: 13
Views: 4821

Re: Rasberry Pi to drive temperature sensor / weather balloon- school project

<t>For a balloon I think you are much better off with a microcontroller. I don't expect you're going to be doing a ton of processing onboard, usually just datalogging and the like, which you can do on a $3 micro that also happen to consume about 50x less power than the Pi. Batteries are heavy and yo...
by error404
Mon Feb 06, 2012 11:56 pm
Forum: Other projects
Topic: Raspberry PI and Zigbee
Replies: 13
Views: 30248

Re: Raspberry PI and Zigbee

<t>riderred said: <br/> <br/> <br/> Would I be better off using Bluetooth.  I want to distribute the same file to several Raspberry PI's in a citca 10m radius (further would be good).  I have seen Bluetooth USB devices from £3.50.  Would that be a better choice? 100KBits bandwidth would be fine.<br/...
by error404
Mon Feb 06, 2012 11:53 pm
Forum: General discussion
Topic: Adding more voltage to r-pi?
Replies: 11
Views: 3265

Re: Adding more voltage to r-pi?

<t>Jessie said: <br/> <br/> I'm willing to bet within the first week.  Someone will use the wrong PSU, or someone will kill one tring to over-volt it trying to push some overclocks.  I'm fairly certin that someone will aslo fry the fuse right away by pulling too much current.<br/> The nice thing abo...
by error404
Mon Feb 06, 2012 11:45 pm
Forum: General discussion
Topic: New post on the front page: a date that'll interest you, and a datasheet that will too.
Replies: 127
Views: 22061

Re: New post on the front page: a date that'll interest you, and a datasheet that will too.

<t>Nice to see a decent datasheet. I'm sure there are some critical omissions, and the functional descriptions are pretty sparse, but it looks to be complete enough to be very useful. Still lots of goofing around to figure out how things work, but we know where to poke at now. Thanks <br/> <br/> Now...

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