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by ceteras
Mon Feb 15, 2016 4:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: LVDS driver board question
Replies: 2
Views: 875

Re: LVDS driver board question

my board has E0,E1,E2,E3 and then 00,01,02,03 - the data sheet shows RxIN0,RxIN1etc. Your board has E0,E1,E2,E3 and then O0,O1,O2,O3, that is Even and Odd. These are two sets of signal outputs used to transfer two pixels at once, for certain displays. Your display has a single set of inputs, RxIN0 ...
by ceteras
Tue Dec 22, 2015 11:10 am
Forum: Off topic discussion
Topic: Temper Tantrum.
Replies: 12
Views: 1120

Re: Temper Tantrum.

My 7 year old daughter learnt the name of the current distribution of the Raspbian OS today and she wasn't impressed. She doesn't see why her little sister gets her name on the download files and why it can't be named after her instead! (yes, the 5yr old is called Jessie). You could build a fake do...
by ceteras
Mon Aug 03, 2015 12:06 pm
Forum: Other projects
Topic: What's the situation with DSi?
Replies: 31
Views: 18165

Re: What's the situation with DSi?

texy wrote:
peepo wrote:.oO does never-never cover this?
...no - and continually asking doesn't make it any quicker either :o

Texy
Nothing will make it any quicker, this is just something else to be swept under the carpet.
by ceteras
Mon May 18, 2015 8:04 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Relay - Switching Earth
Replies: 2
Views: 343

Re: Relay - Switching Earth

Affirmative, that's what relays are for. As long as you use the NO connection on your board, it will have the same functionality.
Make sure your relay can withstand the maximum current required.
by ceteras
Mon May 04, 2015 9:31 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Expand over 700 IOs
Replies: 6
Views: 587

Re: Expand over 700 IOs

You can use CPLD boards for that, you can find them all over the internet.
Look up "cpld io expander board".
by ceteras
Sun May 03, 2015 7:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI monitior compatible with raspberry 2
Replies: 8
Views: 1058

Re: DSI monitior compatible with raspberry 2

is there a timescale on the display, does anyone know? In a February 2015 interview, Eben Uptop said they have an $100.000 inventory of lcd panels for this product, waiting for EMC testing to be complete, and for a timescale he was hoping "end of this quarter... I mean let's say April, I don't see....
by ceteras
Tue Mar 10, 2015 2:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 7 inch Touch Screen on RPi
Replies: 1
Views: 631

Re: 7 inch Touch Screen on RPi

Can you return the RA8875 ? It is intended for use with Arduino, rather than the Pi.

Get the TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout - With Touch.
This needs hdmi, micro-usb and the display. Should work straight out of the box.
by ceteras
Tue Mar 10, 2015 1:30 pm
Forum: General discussion
Topic: Any news on official Raspberry Display?
Replies: 260
Views: 77166

Re: Any news on official Raspberry Display?

RaTTuS wrote:an e-paper would be an excellent choice ;-p but that's not likely
It wouldn't be quite such an excellent choice as there is not enough market for it.
If you want e-paper, you can find third party solutions.
by ceteras
Tue Mar 10, 2015 12:11 pm
Forum: General discussion
Topic: Any news on official Raspberry Display?
Replies: 260
Views: 77166

Re: Any news on official Raspberry Display?

[...] I don't really like that bezel, had hoped for a hardcore finish... also what is the point of that display port if you still need a PCB to drive the damned things? I guess price and touch control quality will tell if it's going to be interesting. I wish they had moved on to color e-paper... pe...
by ceteras
Tue Feb 17, 2015 9:10 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DPI Documentation ?
Replies: 3
Views: 702

Re: DPI Documentation ?

You can find all the info you need here: http://www.raspberrypi.org/forums/viewt ... 00&t=86658 .
by ceteras
Fri Feb 06, 2015 12:04 pm
Forum: General discussion
Topic: Raspberry Pi 2 Model B CPU not centered. Should I worry?
Replies: 12
Views: 1158

Re: Raspberry Pi 2 Model B CPU not centered. Should I worry?

The pick and place machine aligns with the fiducial marks which are very precisely included in the actual pcb design.
You can see one of those in the first picture just above C97 in the upper right corner.
by ceteras
Thu Feb 05, 2015 7:43 am
Forum: General discussion
Topic: My 13 year old son feels cheated
Replies: 37
Views: 4245

Re: My 13 year old son feels cheated

Now he feels cheated and not being told the truth. :( . My son is 13 too, I can understand how they see the world right now, that is how he would feel. Especially if it's his purchase from his own allowance. I think it's your opportunity to explain to him some things about economics and how the wor...
by ceteras
Fri Jan 30, 2015 2:00 pm
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

If the image is inverted, it would be like this:
- cyan instead of red
- magenta instead of green
- yellow instead of blue
by ceteras
Fri Jan 30, 2015 12:09 am
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

There are different shades of all colours on the boot screen and this makes it more difficult.
An rgb screen test like this image would help a lot more: http://1zelda.com/tv/pics/rgb_test.jpg
Image
by ceteras
Wed Jan 07, 2015 11:21 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: DSI Screen Availability
Replies: 35
Views: 8321

Re: DSI Screen Availability

I picked up a couple of generic hdmi adapter board + LCD panel modules to keep me going until the RPi displays show up. The RPi display will be great as it should eliminate the hdmi-LCD adapter board nicely :) and save a bit of power as well! Unfortunatelly it looks like it will be a DSI to LCD int...
by ceteras
Thu Oct 30, 2014 12:59 pm
Forum: General discussion
Topic: noise through amp powered by 5v gpio
Replies: 7
Views: 1740

Re: noise through amp powered by 5v gpio

I'm sorry you didn't find a solution, even if I didn't expect it to be easy to fix. I think none of the gpio gnd pins are appropiate for this, rather you'd need to find a better ground point on the board and solder your connection there. I think I'm going to try this too, soon, because I want to bui...
by ceteras
Wed Oct 29, 2014 9:22 am
Forum: General discussion
Topic: noise through amp powered by 5v gpio
Replies: 7
Views: 1740

Re: noise through amp powered by 5v gpio

I've met this kind of noise before, it's a ground loop issue. In theory, all ground points are at the same voltage, but in reality this is not true. So it matters a lot where on the Pi you connect your amplifier ground connection. Try different places, I would recommend as close as possible to the p...
by ceteras
Fri Oct 10, 2014 11:48 am
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

The load on sync signals is not the same as on the RGB pins, so that math does not apply. For the 1bit part, you have 275 ohm in series with the 75ohm load inside the monitor, you get 350ohm load for each RGB pin. "A white screen would be 275 Ohm cumulatively for one bit through to 8 bit?" For each ...
by ceteras
Thu Oct 09, 2014 12:19 pm
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

It is correct, but for 1bit version, you draw 9.45mA from the RGB pins.
This is not a problem by itself, but you might have to be careful what currents will the other GPIO pins have to source, as there is a limit for the total current on the GPIO bus.
by ceteras
Thu Oct 09, 2014 11:04 am
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

I don't understand how the sync series resistors were thought. The RGB signals are 75ohm impedance, but the sync lines are digital logic, and their requirements are pretty much similar to TTL. That is, a minimum voltage for logic "1" is 2.4V, and maximum voltage for logic "0" is 0.5V. This should sa...
by ceteras
Thu Sep 25, 2014 8:58 pm
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

I've used an SN74HC04N to invert the DE signal and it worked. I've got some horizontal jittering on the image, it could be from the inverter chip or from my ~10cm long dpi wires (or maybe the ground layout). This would make a nice raspberry pi laptop, I believe it's the lowest-power solution for a g...
by ceteras
Thu Sep 25, 2014 1:32 pm
Forum: Other projects
Topic: first design for an hdmi to lvds adapter
Replies: 78
Views: 68457

Re: first design for an hdmi to lvds adapter

I'm not really sure I understand where's your level of expertise with electronics. If you had the eagle pcb files, would you be able to make your own pcb, then solder the parts? This chip in particular is a little difficult to solder because it has 0.5mm pin pitch and a ground exposed pad underneath...
by ceteras
Wed Sep 24, 2014 1:51 pm
Forum: B+ addons
Topic: HATless B+ possible? [solved]
Replies: 6
Views: 1078

Re: HATless B+ possible?

I've got my answer from HeBus' post here. One could setup a custom dt-blob.bin where the GPIO 0/1 are set to a particular function, and lose the HAT functionality without any side effects. pin@p0 { function = "dpi"; termination = "no_pulling"; }; // Pixel Clock pin@p1 { function = "dpi"; termination...
by ceteras
Wed Sep 24, 2014 1:48 pm
Forum: B+ addons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 67389

Re: Gert's VGA add-on for the B+

Try active_low, for the sake of trying. I'm very interested in this too (but I only have a frequency counter, no scope, to test it). If it's still reversed, you could fix it with a fast inverter logic circuit (74F04 or something). Edit: pin@p16 { function = "output"; termination = "pull_up"; polarit...

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