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by Allan
Thu May 16, 2013 6:52 pm
Forum: Camera board
Topic: Video is mirror image
Replies: 22
Views: 10605

Re: Video is mirror image

Thanks James. I'm in no rush, there are plenty of other things to fiddle with.
by Allan
Thu May 16, 2013 4:42 pm
Forum: Camera board
Topic: Video is mirror image
Replies: 22
Views: 10605

Re: Video is mirror image

James, if you do the fix in firmware does that mean the preview will work? Currently, adding -hf to the command produces an image the right way round but the preview doesn't display, just a brief flash as the image is taken at the end of the preview period.
by Allan
Thu May 16, 2013 2:11 pm
Forum: Camera board
Topic: Video is mirror image
Replies: 22
Views: 10605

Re: Video is mirror image

Can I throw in a vote for having the image flipped (or rather 'correct') by default please. The current behaviour is just weird.
by Allan
Thu Mar 08, 2012 10:36 am
Forum: General discussion
Topic: Raspberry Pi demand running at '700 per second'
Replies: 9
Views: 1889

Re: Raspberry Pi demand running at '700 per second'

<t>Toby said: <br/> <br/> <br/> Allan said: <br/> <br/> <br/> Hmmmmm. 700 per second eh? 42,000 per minute? Something over sixty MILLION per day?<br/> <br/> I know the Raspi is popular but really, sixty million per day? Over a third of a billion since launch?<br/> <br/> I think someone's dropped a d...
by Allan
Wed Mar 07, 2012 7:34 pm
Forum: General discussion
Topic: Raspberry Pi demand running at '700 per second'
Replies: 9
Views: 1889

Re: Raspberry Pi demand running at '700 per second'

Hmmmmm. 700 per second eh? 42,000 per minute? Something over sixty MILLION per day?

I know the Raspi is popular but really, sixty million per day? Over a third of a billion since launch?

I think someone's dropped a decimal point or three!
by Allan
Fri Feb 03, 2012 7:17 pm
Forum: Off topic discussion
Topic: Unofficial Raspberry Pi kits to be made availabne.
Replies: 31
Views: 5953

Re: Unofficial Raspberry Pi kits to be made availabne.

This sounds AWESOME!!!!!!! wen can i get 1?
by Allan
Thu Feb 02, 2012 5:25 pm
Forum: Other projects
Topic: qudrocopter UAV drone
Replies: 30
Views: 20271

Re: qudrocopter UAV drone

I thought that most PIC devices these days have a low voltage programming mode selected by setting a bit in one of the configuration words?

Works for me!
by Allan
Thu Feb 02, 2012 4:34 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 6915

Re: Can you power the Pi from GPIO?

<t>Nullstring is right, using a linear regulator is a waste of power. A switch mode regulator like the one you linked to is way more efficient and won't need the heatsink so the lack of a tab isn't an issue.<br/> <br/> But they are more complicated to use. Look at the data sheet - you need a handful...
by Allan
Thu Feb 02, 2012 4:21 pm
Forum: Other projects
Topic: qudrocopter UAV drone
Replies: 30
Views: 20271

Re: qudrocopter UAV drone

<t>I would have thought that a PIC, programmed in assembler, without all the overhead of on OS would probably be faster than the RasPi in a control application.<br/> <br/> My choice (and I am interested in this application!) would be to use a PIC for the basic control loops needed to keep the aircra...
by Allan
Thu Feb 02, 2012 3:40 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 6915

Re: Can you power the Pi from GPIO?

<t>schlomo said: <br/> <br/> <br/> Ah, okay. Thanks for the clarification from error404, Abishur, and Gert.<br/> <br/> I'm planning to use a 1.5A (3A trip) polyfuse and a 5v LDO (something like this) to convert a 3-cell LiPo input voltage (max around 11.1v) to a regulated 5v signal to power both an ...
by Allan
Thu Feb 02, 2012 2:48 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 6915

Re: Can you power the Pi from GPIO?

<t>scubaguy said: <br/> <br/> <br/> Allan/Gert,<br/> <br/> Thinking about it, why would the 3v3 regulator have issues as it wouldn't have 5v on its input side?  I only intended supplying 3v3 - or are you suggesting the 5V would come in on the output USB from the powered hub?<br/> <br/> <br/> <br/> T...
by Allan
Thu Feb 02, 2012 1:22 pm
Forum: General discussion
Topic: Can you power the Pi from GPIO?
Replies: 31
Views: 6915

Re: Can you power the Pi from GPIO?

scubaguy said:

As a separate question, can I power the processing side of the RasPi from the 3v3 pin on the GPIO?

No. The 3v3 supply is derived from 5v using an onboard regulator which won't take kindly to having 3v3 connected to its output pin.
by Allan
Thu Feb 02, 2012 12:54 pm
Forum: General discussion
Topic: Moderated blog comments: your input wanted!
Replies: 57
Views: 9189

Re: Moderated blog comments: your input wanted!

<t>+1 on disabling comments on both blog and FAQ. Is it possible to trim the existing FAQ comments too? 1,861 'thoughts' is rather a lot and very few of them add anything to the FAQ.<br/> <br/> Moving away from the Wordpress forum software would be a good step too. I appreciate it would be a lot of ...
by Allan
Tue Jan 10, 2012 10:39 pm
Forum: Other projects
Topic: 1 Wire Sensors for home heating control
Replies: 21
Views: 14760

Re: 1 Wire Sensors for home heating control



Allan said:

The "standard" 1W bus has a 4k7 pullup resistor so the GPIO only needs to sink some 700nA.


700nA? Did I really say 700nA? it"s 700uA – silly boy Allan!
by Allan
Tue Jan 10, 2012 6:03 pm
Forum: Other projects
Topic: 1 Wire Sensors for home heating control
Replies: 21
Views: 14760

Re: 1 Wire Sensors for home heating control

<r>TonyD said: <br/> <br/> <br/> Probably not. I don"t think the RPi GPIO would have enough current.<br/> <br/> <br/> <br/> I don't see why not. The 'standard' 1W bus has a 4k7 pullup resistor so the GPIO only needs to sink some 700nA.<br/> <br/> If you want to do it the USB way I believe the  DS949...

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