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by TechColab
Tue Aug 01, 2017 2:49 pm
Forum: Networking and servers
Topic: SATA drives via port multiplier
Replies: 0
Views: 864

SATA drives via port multiplier

Just an FYI to say I've successfully tested RAID on multiple SATA HDDs using a cheap SATA 1-to-5 port multiplier and a rare but fair value USB3.1-to-eSATA adapter with port-multiplier support. $32.95 USB3.1 to eSATA bridge adaptor with port multiplier support. Plus shipping from CA, USA. http://www....
by TechColab
Tue Jan 28, 2014 1:20 pm
Forum: Graphics, sound and multimedia
Topic: Movie enhancement with physical effects
Replies: 1
Views: 487

Re: Movie enhancement with physical effects

The previous DropBox link has now been taken down as the whole project,
including code, is now up on GitHub:
https://github.com/TechColab/stfx
by TechColab
Thu Jan 23, 2014 1:44 am
Forum: Graphics, sound and multimedia
Topic: Movie enhancement with physical effects
Replies: 1
Views: 487

Movie enhancement with physical effects

Hi, I've just done a project for adding physical effects synchronized to movies, in-house/theater rather than on-screen. For example, flashing a big neon sign saying "SPOONS" at certain points during Tommy Wiseau's infamous cult masterpiece "The Room". More details here: https://dl.dropboxuserconten...
by TechColab
Sun Nov 17, 2013 10:25 pm
Forum: General discussion
Topic: Some feedback for a revision 3 board
Replies: 20
Views: 3459

Re: Some feedback for a revision 3 board

Another cheap option to be considered for the next revision, rather than the next version: 3 'solder pad switches' for power & USB data, pre-configured as default for normal model 'B' operation. But with option to break a track/solder-blob and add a 3-pin header on each of the locations so that the ...
by TechColab
Thu Jun 20, 2013 12:37 pm
Forum: Automation, sensing and robotics
Topic: Help with controling 4 SSRs - H E L P !!!
Replies: 7
Views: 1850

Re: Help with controling 4 SSRs - H E L P !!!

I have some very similar SSRs which helpfully include an indicator LED. Wiring straight to the RPi as discussed above should work fine. Handy tip though: After connecting your mains load wires, I'd strongly recommend a bit of duct tape over those screw terminals. Just in case of accidental touching ...
by TechColab
Thu Jun 20, 2013 12:22 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi i2c doesn't detect BMP085 sensor.
Replies: 18
Views: 4793

Re: Raspberry Pi i2c doesn't detect BMP085 sensor.

I have one of these on each I2C bus & they both work fine. Double check that you've done ALL of the bits in Adafruit's documentation, following all the tangent links for sub-steps. Roughly this should include: Good soldering, no solder blobs or dry joints. Use the correct GPIO pins for your RPi. Upd...
by TechColab
Tue Jun 18, 2013 11:20 pm
Forum: General discussion
Topic: Some feedback for a revision 3 board
Replies: 20
Views: 3459

Re: Some feedback for a revision 3 board

Next revision (almost no cost, no change to existing add-ons): Jumper or solder pad for powering the USB/Ethernet so you can reduce power consumption on some projects. Make I2S available Make both I2C buses available Make full hardware handshake lines available for serial Make additional serial avai...
by TechColab
Fri May 24, 2013 3:20 pm
Forum: Camera board
Topic: Self Portraits of the RPi
Replies: 1
Views: 926

Self Portraits of the RPi

Hi, I'm surprised that nobody seems to have done this yet.
So here is a photo of my "PiLab" taken from the RPi itself.
I used a large mirror & it was quite difficult to get it centered.
Unfortunately, the RPi itself is hidden by a display board.
by TechColab
Wed May 01, 2013 2:47 am
Forum: Automation, sensing and robotics
Topic: Weather Station now running
Replies: 159
Views: 79206

Re: Weather Station now running

The replacement parts for weather gubbins that Maplin do very cheaply seem to be the same as the quite expensive kit from SparkFun (who have a manual for it !!) https://www.sparkfun.com/products/8942 I have the rain gauge - reed switch changes once per bucket full (details in the manual above). I ha...
by TechColab
Wed May 01, 2013 2:26 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Enable both I2C Busses
Replies: 58
Views: 30646

Re: Enable both I2C Busses

I too have successfully got the second I2C working by some very delicate soldering on the base of S5 (not P5) of my Rev.1 Model B. I have a pair of BMP085 pressure sensors (from Adafruit) with one on each bus and they both work fine without any software/driver/GPIO re-configuration. You just need to...
by TechColab
Sat May 26, 2012 12:59 pm
Forum: Other projects
Topic: Punnet - a print at home cardboard case
Replies: 149
Views: 164597

Re: Punnet - a print at home cardboard case

I got my Pi a cuple of days ago. The alpa is pretty good but does, as you expected, need a couple of tweaks. I might have a go at tweaking it myself in OpenOffice Draw. 1) Most significantly, the audio socket is closer to the composite video socket (4mm?) and it's on the same base lne, not the same ...
by TechColab
Sat Apr 21, 2012 10:49 pm
Forum: General discussion
Topic: I have built my own Raspberry PI
Replies: 21
Views: 12998

Re: I have built my own Raspberry PI

projectgregory said:


I have built my own Raspberry PI but for some reason it does not work.

I bet it still works better than Windows 8.

by TechColab
Sat Apr 07, 2012 11:24 am
Forum: Other projects
Topic: Cluster (Bramble...) Design Discussion (Advanced)
Replies: 170
Views: 83239

Re: Cluster (Bramble...) Design Discussion (Advanced)

<r>I've always fancied playing with clusters and had the idea of using a VM as the head/control/master.  Partly because I'd hate to waste node hardware on mere admin tasks but mostly because with so many different cluster configurations etc. a VM head brings the benefits of multiple images & sna...
by TechColab
Sun Mar 18, 2012 4:36 pm
Forum: General discussion
Topic: Re: Sad about removal of I2S. Why was this change made?
Replies: 76
Views: 45361

Re: Sad about removal of I2S. Why was this change made?

<r>~Neil~ said: <br/> <br/> Its not easy to do bit-banging on a Linux system unless you play nasty tricks with system locks, and it'd kill performance.<br/> I'd definitely go micro-controller over bit-banging but it's got to be easier at PWM/rs232 speeds than I2S speeds.  You could call it an opport...
by TechColab
Fri Mar 16, 2012 11:26 am
Forum: Other projects
Topic: High quality USB 2.0 sound card (24 bit/192 kHz)
Replies: 23
Views: 20221

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

<t>berry_germany said: <br/> <br/> <br/> I don't think it's the best way to use the onboard I2S connection if you want a high quality device. Better use a USB DSP to transform the signal into I2S or S/PDIF like the<br/> <br/> All of the async USB devices take their data (at their own pace) from the ...
by TechColab
Thu Mar 15, 2012 11:02 am
Forum: General discussion
Topic: Re: Sad about removal of I2S. Why was this change made?
Replies: 76
Views: 45361

Re: Sad about removal of I2S. Why was this change made?

<t>I too am very keen for I2S which in the next revision should get priority over another PWM or UART(rs232) etc. for admittedly selfish but I think justifiable reasons:<br/> <br/> 1) PWM & serial can both be done either directly in software (bit-banging) or by off-loading to a cheap micro-contr...
by TechColab
Wed Mar 07, 2012 11:27 pm
Forum: General discussion
Topic: Connecting FM radio speakers to Raspi
Replies: 7
Views: 2129

Re: Connecting FM radio speakers to Raspi

You could open the radio up & trace the circuit to find the point where the audio decoded from the RF section is passed to the audio amplifier section.

If the radio has a head-phone output that cuts-out the speaker, then this would be the right point to start hacking.
by TechColab
Wed Mar 07, 2012 6:40 pm
Forum: Other projects
Topic: High quality USB 2.0 sound card (24 bit/192 kHz)
Replies: 23
Views: 20221

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

<t>R1ck said: <br/> <br/> <br/> TechColab I think you are lucky...you still not infected by audiophilist virus <br/> <br/> I think I would be a lot nicer to get the I2S connection back ( much better than usb for audio) and connect the raspi to something like this:<br/> <br/> http://www.twistedpearau...
by TechColab
Wed Mar 07, 2012 3:53 pm
Forum: Other projects
Topic: video digitizer
Replies: 7
Views: 2784

Re: video digitizer

Search for my post on a "KVM2VNC" device which includes video digitizer function.
by TechColab
Wed Mar 07, 2012 3:33 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14492

Re: Guitar amp modelling

<t>jzu said: <br/> <br/> How much for a standalone 16-bit ADC chip? Last time I checked, ordering a single MAX 1132 from Maxim would cost a few Raspberries. And it would probably need a preamp stage (I like FETs here). Compare this with ~ €25 for an UCA202...<br/> <br/> I've been looking at making a...
by TechColab
Wed Mar 07, 2012 1:08 pm
Forum: Other projects
Topic: Point of Sale Terminal (ssh w/ X Forwarding)
Replies: 24
Views: 11435

Re: Point of Sale Terminal (ssh w/ X Forwarding)

<t>Non-POS person making wild speculation (out of the box thinking?):<br/> <br/> The price of a touch-screen seems a very high proportion of system cost.<br/> <br/> The market of cheap <$250 tablets is exploding, and a tablet is a much more finished looking device than touch-screen + mount + box of ...
by TechColab
Tue Mar 06, 2012 3:14 pm
Forum: Other projects
Topic: Arduino-like custom breakout board
Replies: 21
Views: 8198

Re: Arduino-like custom breakout board

<r>schlomo said: <br/> <br/> AVR ATmega1284P with external crystal<br/> I"'m planning to fit all this on a 5x7cm PCB and aiming for a kit price around $25.<br/> I don't know the micro controllers well enough to compare but would it be worth considering using either of the <URL url="http://www.pjrc.c...
by TechColab
Tue Mar 06, 2012 2:47 pm
Forum: Other projects
Topic: Digital Satellite Receiver
Replies: 3
Views: 11179

Re: Digital Satellite Receiver

<r>andream said: <br/> <br/> <br/> Hi everyone,<br/> <br/> do you think the Raspberry Pi could be coupled with a nice USB box like this one…<br/> <br/> <URL url="http://www.tbsdtv.com/english/...../5922.html">http://www.tbsdtv.com/english/...../5922.html</URL><br/> <br/> …to form an ultra cheap Linu...
by TechColab
Tue Mar 06, 2012 12:08 pm
Forum: Other projects
Topic: High quality USB 2.0 sound card (24 bit/192 kHz)
Replies: 23
Views: 20221

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

<r>BornToLag said: <br/> <br/> <br/> Grumpyoldgit said: <br/> <br/> <br/> So, you're going to attach a $149 sound card to a $25 computer!<br/> <br/> <br/> Yes! A ~$175 solution for this sort of functionality, sound quality and size is very good value compared to similar devices out there.<br/> <br/>...
by TechColab
Tue Mar 06, 2012 11:41 am
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 232
Views: 380754

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

<r>KVM2VNC<br/> A portable, external, hot-pluggable interface to control a headless server.<br/> Basic functionality of HP iLO or Dell DRAC, like this ..<br/> <URL url="http://www.epiphan.com/product.....s/kvm2usb/">http://www.epiphan.com/product.....s/kvm2usb/</URL><br/> .. but with the much higher...

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