Comments for www.electronics.diycinema.co.uk

Comment on Probing the mini2440 I2C bus by Doug

Doug — Fri, 27 Jan 2012 17:14:32 +0000

Hi Wingston,

Have you seen this driver?

http://code.google.com/p/s3c2440camera/

It’s just a guess, but maybe the camera needs something like a chip select line pulled low to enable it, in which case if you don’t have the pins configured properly in your kernel, or you’re not following the correct procedure it might not show up on the I2C bus. That’s purely speculation – you’d have to read the datasheet to check.

I haven’t followed progress on it, but i ported the driver to 2.6.32.7 (pretty trivial if i remember). I’ll try and dig it out over the weekend.

Doug

Comment on Probing the mini2440 I2C bus by Wingston

Wingston — Fri, 27 Jan 2012 16:52:21 +0000

Hey Doug,

I am using the friendly arm cam130 module. if I’m right that should be on the I2C bus at address 60. I know the camera module is working as i have got it running with the test2440 application that came on the DVD. So the camera module works – no loose contacts and all that. but in linux, i can’t find it on i2cdetect. It showed the UUUUU part that the EEPROM, but the rest of the table was just dashes. and my driver is failing at the point where it should get the cameras manufaturing address.
Any ideas on how i can detect this camera on the bus?

Comment on New hardware! by Doug

Doug — Sat, 24 Dec 2011 15:16:18 +0000

Sorry i can’t help with the part number, but i can tell you it’s the same pitch as a 2.5″ IDE HDD connector. At one stage i butchered one of these for a sensor. Some pin header which you can cut to size would probably be the easiest thing to find in a store, or you could make a ‘squid cable’.

Comment on New hardware! by Wingston

Wingston — Sat, 24 Dec 2011 11:21:03 +0000

I want to know – what is that black connector that goes to the cable called. I’m having a lot of difficulty getting a hold of that cable to get to my GPIO pins. I can’t get them from online (no card!) – so i need to find the cable in some shop.. but which kind of shop can i get them from?

Comment on Building Angstrom for the mini2440 with Fedora 15 by Doug

Doug — Wed, 30 Nov 2011 22:43:20 +0000

Thanks Jon There’s a lot of stuff from “behind the scenes” i need to write up!

Comment on Building Angstrom for the mini2440 with Fedora 15 by Jon

Jon — Wed, 30 Nov 2011 09:58:33 +0000

Excellent to see that your blog is alive again!
Missed your posts in the last 1.5 years.

Comment on Configuring Open Embedded to bake Angstrom images for the mini2440 by Doug

Doug — Mon, 28 Nov 2011 19:25:58 +0000

Sounds like a misconfiguration. Have a look at your local.conf . Uncommenting INHERIT = “package_ipk”, or similar should get you on your way. If you trying to bake the current repo you are not in for an easy ride. I’d start with BusError’s original repo as OE has changed a lot since i last posted. Quick post on that coming up.

Comment on Bitbaking the kernel, Angstrom and qt4-embedded all at once by Doug

Doug — Mon, 28 Nov 2011 19:16:25 +0000

Sounds like no recipe, are you sure the name’s correct? If you can’t find it you might need to pull it in from the OE classic branch.

Comment on CAT3626 RGB LED Driver + Qt Embedded 4.6 on the Mini2440 by Doug

Doug — Mon, 28 Nov 2011 19:08:48 +0000

Hi Francesco, sorry for the slow reply and thanks for the comments! I used standard stuff for the soldering. It requires patience, but i’ve soldered quite a few chips this way with good results.

As for equipment I’ve got a Xytronic LF-1000 iron with the standard 2-3mm wide chisel style tip. It would be nice to have something a bit smaller, but i can get away with using the corner on this. I’ve used some standard enamelled wire from Maplin. I don’t remember the thickness, but it’s pretty thin, probably about 0.2mm diameter. If it’s too thick you can easily pull pads off the components which happened to me the first time i tried. Finally i think this is with leaded solder, although i have used unleaded as well (not so easy).

I start by stripping the end of the wire with a knife. I then lightly tin the wire and the pad, clean the iron tip and press them together. A gentle tug ensures it’s stuck properly. After doing all the wires i check continuity between all the pads. Normally there aren’t any problems, but sometimes you’ll need to touch things up a bit. Finally i thread the wires into the veroboard, epoxy the chip in place to protect the wires, crank the iron up to about 330 and solder the other ends to the board. With the iron set a bit higher you can normally get away without stripping the enamel off. If everythings fine i’ll then use a bit more epoxy to protect it.

I’ll put a video up next time! My personal record is the Infineon TVS diode, although for this i did have to use a very fine pointed tip. Here’s a picture of it next to an ant!

http://de.sitestat.com/infineon/infineon/s?infineon.media.press.Image.press_photo.TVS_diode_ant.jpg&ns_type=clickin&ns_url=http://www.infineon.com/export/sites/default/media/press/Image/press_photo/TVS_diode_ant.jpg

Comment on CAT3626 RGB LED Driver + Qt Embedded 4.6 on the Mini2440 by Francesco Brasini

Francesco Brasini — Wed, 19 Oct 2011 10:24:20 +0000

Hi,

thank you for sharing your work on the mini2440.

I’m astonished by you soldering skills: would you be so kind
to share with us the techniques you use to weld SMD
components that small?

A couple of questions just come to my mind:
which solder tips do you use (shape and thickness)?
which wires?

And, of course, you should post videos on youtube!