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by PaulTech
Mon May 14, 2012 6:33 pm
Forum: Automation, sensing and robotics
Topic: Weather Satellite Receiving Station
Replies: 19
Views: 16814

Re: Weather Satellite Receiving Station

The main reason the FM broadcast receivers don't work is noise. The WX is 25KHz wide and FM is 125KHz wide. I wish you could simply up-convert, it would have saved me a lot of time & money building WX sat receivers. Playing with RTLs now, and will soon have one on WX duties. I would definately like ...
by PaulTech
Wed May 09, 2012 9:47 pm
Forum: Other projects
Topic: Software Defined Radio
Replies: 61
Views: 31279

Re: Software Defined Radio

<t>caulktel, after getting my RTL SDR I decided to buy a soft66lite which was quite easy to build, I'm now trying to get a DDS attached to a arduino to control the frequency. And I'm looking at an old scanner trying to work out the best way to attach a connector to the 10.7MHz IF. Maybe use the 232 ...
by PaulTech
Sun May 06, 2012 9:42 pm
Forum: Automation, sensing and robotics
Topic: Weather Satellite Receiving Station
Replies: 19
Views: 16814

Re: Weather Satellite Receiving Station

I have seen in another post someone has made a driver for the RTL on RPi, really even using two RPis(one receive,one processing) and a RTL SDR would still be cheaper than most 137MHz receivers.
by PaulTech
Sun May 06, 2012 9:35 pm
Forum: Other projects
Topic: Raspberry Pi in space! Need advice :)
Replies: 25
Views: 5962

Re: Raspberry Pi in space! Need advice :)

<t>See/Google APRS for existing projects. If your thinking of using DTMF (16 symbol)you can do a lot better than 2bytes/sec, just take some time and think about the encoding/decoding.  The cameras could be stripped down digital cams, not web cams, and take a picture every x seconds - y seconds after...
by PaulTech
Sun May 06, 2012 7:23 am
Forum: Other projects
Topic: Weather Station
Replies: 25
Views: 13969

Re: Weather Station

http://www.austriamicrosystems.....sor/AS3935

Don't know how much they cost, but look like a useful addition to any weather station
by PaulTech
Fri Apr 06, 2012 6:46 am
Forum: Other projects
Topic: Software Defined Radio with the Funcube Dongle
Replies: 13
Views: 5771

Re: Software Defined Radio with the Funcube Dongle

<t>Well, I think the chinese suppliers must be about to run out of these dongles. If the R-pi can handle them they would make a very handy interface for them, at about $50 +taxes a very wide band SDR which could be used as a GPS and/or data receiver in a R-Pi setup. Or as a stand alone SDR receiver ...
by PaulTech
Sun Apr 01, 2012 9:07 pm
Forum: Other projects
Topic: Software Defined Radio with the Funcube Dongle
Replies: 13
Views: 5771

Re: Software Defined Radio with the Funcube Dongle

<t>Davespice, these are receivers, so no transmitting licence required.<br/> <br/> The TV/DAB dongle opens up a lot of areas the Funcube can't reach, GPS satellites(with amp) and ADS-B are just two. GnuRadio already has the blocks for both but I think the Funcube is to narrow band to really work wel...
by PaulTech
Wed Mar 28, 2012 9:51 pm
Forum: Other projects
Topic: Software Defined Radio with the Funcube Dongle
Replies: 13
Views: 5771

Re: Software Defined Radio with the Funcube Dongle

Think I'll be ordering one too, probably from DX so it should arrive at about the same time I get my Pi in a years time
by PaulTech
Fri Mar 23, 2012 7:33 am
Forum: Other projects
Topic: Suggestion: Tiny PCB for DC-anything to 5 V DC
Replies: 50
Views: 15570

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

<t>I have built switchmode supplies for project for over twenty years, but now thanks to ebay I can buy a LM2956 ready built module, with adj voltage down to 1.6V @ 1A for about $1.50 delivered. I can't buy the IC for that, forget about the rest of the components or board. They're very small modules...
by PaulTech
Sun Mar 18, 2012 7:10 am
Forum: Other projects
Topic: Cheap Robot Starting Point
Replies: 7
Views: 2009

Re: Cheap Robot Starting Point

Looks like the wheels are made of plastic, they tend to slip unlike rubber but that is why they're cheap.
by PaulTech
Sun Mar 18, 2012 7:07 am
Forum: Other projects
Topic: Coffee over IP
Replies: 19
Views: 9731

Re: Coffee over IP

That's assuming you want American boiled coffee, no problem for me I just wander out out my esspresso maker, hit a button, it grinds and brews automatically - all in under a minute.

The Senseo with the pods seem like a lot of work in comparison.
by PaulTech
Thu Mar 15, 2012 4:38 am
Forum: Other projects
Topic: The AutoPlane Project
Replies: 40
Views: 33028

Re: The AutoPlane Project

<t>I was just looking at a boot time video of the R-Pi and it seems to take about 10 secs to boot. Not bad and it could probably be reduced by not running video drivers etc BUT in a UAV or even a fast robot and something nasty does happen to trigger a WatchDog Timer reset( and when would that ever h...
by PaulTech
Wed Mar 14, 2012 9:11 pm
Forum: General discussion
Topic: Raspberry Pi Schematics
Replies: 21
Views: 10151

Re: Raspberry Pi Schematics

Where are the Pis being made now?

As for the schematic question it is rather like PCs, the first 8088s could be built on breadboard but as the complexity increased few have tried that again.  Just as long as the PCI slot works and video comes out everyone is happy.
by PaulTech
Wed Mar 14, 2012 8:49 pm
Forum: General discussion
Topic: pricing in Australia
Replies: 17
Views: 5837

Re: pricing in Australia

<t>Hardly a price match for the fake arduino boards from China, yes I know the performance isn't the same but for a lot of my projects they are more than enough.<br/> <br/> I'll be waiting to see what happens to the price and given that it is open hardware AND being made in China already, how many w...
by PaulTech
Wed Mar 07, 2012 5:41 am
Forum: Other projects
Topic: Controlling a mains power socket switch? (home automation)
Replies: 174
Views: 59589

Re: Controlling a mains power socket switch? (home automation)

For some inspiration why not visit http://www.bwired.nl show juast what can be done, I think he did a lot of the soldering himcelf.
by PaulTech
Wed Mar 07, 2012 12:45 am
Forum: Other projects
Topic: FishPi - automated surface vessel.
Replies: 39
Views: 10263

Re: FishPi - automated surface vessel.

<r>viciouspenguin said: <br/> <br/> <br/> i found an autonomous submersible, not quite as long range but intetesting enough. they popped up while searching for a usb compass.<br/> <br/> ocean server"s IVER2 <URL url="http://www.iver-auv.com">http://www.iver-auv.com</URL><br/> <br/> And they start at...
by PaulTech
Tue Mar 06, 2012 2:14 am
Forum: Other projects
Topic: How about a car entertainment system with built-in engine car management system?
Replies: 10
Views: 4538

Re: How about a car entertainment system with built-in engine car management system?

You will need to add some analog inputs for Temp,EGO etc I2C ADCs should be fast enough.
by PaulTech
Tue Mar 06, 2012 1:31 am
Forum: Other projects
Topic: FishPi - automated surface vessel.
Replies: 39
Views: 10263

Re: FishPi - automated surface vessel.

<r>A quick look on ebay provided this example<br/> <br/> <URL url="http://www.ebay.com/itm/Newest.....2a13a5fe69">http://www.ebay.com/itm/Newest.....2a13a5fe69</URL><br/> <br/> Not big enough for a 70W panel, but it might be enough to start testing.<br/> <br/> Some of this type of boat also include ...
by PaulTech
Tue Mar 06, 2012 12:31 am
Forum: Other projects
Topic: Concept for a case
Replies: 121
Views: 71874

Re: Concept for a case

<t>I had an idea last night, why not rip apart a USB 104 keyboard and see if it could be squeezed into one, a 4 port Powered USB hub would have to go in also. The keyboard could be hardwired to the hub leaving 3 ports. I suppose the concept is very similar to the OLD 8bit computer consoles of the 70...
by PaulTech
Sat Mar 03, 2012 2:14 am
Forum: Other projects
Topic: Weather Station
Replies: 25
Views: 13969

Re: Weather Station

<t>error404 said: <br/> <br/> <br/> I don't pretend to be an expert, but my understanding is that there's quite a bit to properly siting the sensors, protecting them from wind and sun and so on. I was thinking of a guy that embarked on a DIY weather station project and wrote up the issues he had wit...
by PaulTech
Sat Mar 03, 2012 2:04 am
Forum: Other projects
Topic: I2C bus - anyone planning to use it?
Replies: 30
Views: 19161

Re: I2C bus - anyone planning to use it?

<t>Simon H said: <br/> <br/> <br/> Definately, it will be the first thing I will be getting working.<br/> <br/> I use I2C for 24x4 LCD displays, DS1307 RTC, temerature sensor IC"s and I/O expanders currently all connected to an Arduino for Home automation.<br/> <br/> Also at work I2C is the main com...
by PaulTech
Sat Mar 03, 2012 2:00 am
Forum: Other projects
Topic: High quality USB 2.0 sound card (24 bit/192 kHz)
Replies: 23
Views: 20495

Re: High quality USB 2.0 sound card (24 bit/192 kHz)

<t>berry_germany said: <br/> <br/> <br/> @cloudsloth<br/> <br/> Hmm difficult to say – but i would say there are no big improvements<br/> <br/> 1.This box has no asynchron usb<br/> <br/> 2.Sampling rate is for HD audio to low (48 KHz). For stereo HD audio you"ll need at least  96 KHz (like most of t...
by PaulTech
Sat Mar 03, 2012 1:48 am
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 233
Views: 398480

Re: The projects list. Look here for some ideas.

<r>tr1ck5t3r said: <br/> <br/> <br/> ethelthefrog said: <br/> <br/> <br/> I was thinking about using one as a NAT/Firewall thingy for my house.  The ADSL line rate isn"t going to stress the USB at all, even with two ethernet interfaces plugged in.  Log messages can be forwarded to the always-on hous...
by PaulTech
Sat Mar 03, 2012 1:37 am
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 233
Views: 398480

Re: The projects list. Look here for some ideas.

<t>Ennio said: <br/> <br/> <br/> fireraisr said: <br/> <br/> <br/> Ennio said: <br/> <br/> <br/> Hi everyone!<br/> <br/> I don't know a single thing about linux and debian; so far I've installed xubuntu on virtualbox and the terminal told me I do forbidden things.<br/> <br/> But enough talking about...

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