Show Posts
Pages: 1 2 3 [4] 5 6 ... 83
46  Using Arduino / Project Guidance / Re: DIY Ambilight from VGA splitter cable possible? on: February 06, 2013, 04:46:28 am
This is beyond the capabilities of a standard Arduino. You would need a high-speed triple ADC to start. You'd need to analyze the HSYNC and VSYNC signals to identify regions around the edges of the display, then possibly integrate the values of those regions to retrieve a color average. It's not a trivial project.
47  Using Arduino / Project Guidance / Re: Disco LED Dancefloor + more on: February 06, 2013, 03:21:48 am
Looks like a great project! I can chime in on the LEDs. 120mm / 8 is 15mm LED spacing. If you can live with 16.67mm spacing, either by dropping an LED or expanding the diameter to 134mm, then the new WS2811/WS2812 pixels would be pretty much ideal. I just put some in my store, but you can probably locate them elsewhere: http://macetech.com/store/index.php?main_page=product_info&cPath=1&products_id=44

That strip is spaced at 16.67mm between LEDs. Each LED is 5x5mm, and a couple mm tall. Every LED can be addressed separately, and the strips can be cut at any point. So you could do 8 across, 6 across, 4 across, etc in order to fit within your round platform. Only 8 strips needed.

Actually constructing the platform could be fun. It would be ideal to take a layered approach. First, a white plastic layer for the LED strips to be glued on. Then, an opaque white layer with laser cut square holes, leaving thin lightproof barriers between each pixel. Maybe 1/4 or 3/8 thick. Then, a layer of translucent white plastic; perhaps 40% or 60% sign-white, 1/8" thick. Below that, the base could be made thick enough to hold electronics and batteries (AA probably best choice, but a flat Lithium-Ion could work).

I'm assuming you'd need some wires leading up to the disco ball motor. A small channel for that could be built into the design, along with laser cut holes to match pins on the feet of the model and allow easy gluing.

A little tougher, but the same type of LEDs could be installed in several locations on the model itself.

If all this is daunting...the project looks fun enough that I'd be willing to help out with laser cutting and constructing the LED base at least.
48  Using Arduino / Project Guidance / Re: RGB LED Matrix spread over 400 square feet (43 square meters) on: January 30, 2013, 05:48:48 am
This project isn't really that bad. I'd use an Arduino Mega (for the larger SRAM, mostly) and see what can be done with WS2811 pixels. Break up the array into several 50-100 pixel chains. It would still be a lot of soldering, unless you got some small custom boards and cables made. I don't see any easy solution coming in much less than $1500...that's how projects work, you have to trade knowledge and work for money in one direction or the other.
49  Using Arduino / LEDs and Multiplexing / Re: Led matrix : ROW control madness on: January 28, 2013, 03:41:03 pm
No one's saying it wouldn't work, but generally people aren't happy with the LED brightness if it's only on 1/30th of the time.
50  Using Arduino / LEDs and Multiplexing / Re: Led matrix : ROW control madness on: January 27, 2013, 05:38:20 pm
It would be better if you wired it as a 90x10 or even 180x5 array. A refresh rate of 1:30 will be very dim and flickery. Then you can use a couple of I/O and some transistors for each row.
51  Using Arduino / LEDs and Multiplexing / Re: Lost with 50w LEDs + PWM on: January 19, 2013, 03:04:02 pm
Use some nice big NMOS transistors, and the slowest PWM you can bear. Might need to drive the gates higher than 5V to avoid heating.
52  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 17, 2013, 06:12:21 pm
Most places that can handle 4mil rules can do it, but I still have to cheat by altering the shape of the outer BGA pads. A couple of PCBAs have reviewed this and seem to think it will work fine; one even said it's approximately what they would have done to my Gerbers without my asking.

53  Using Arduino / LEDs and Multiplexing / Re: MegaBrite RGB on: January 17, 2013, 06:09:38 pm
The plan was to use them with cables and mount them on objects, rather than plug them into a breadboard or solder them into a PCB. Therefore the angled headers seemed less of a problem. We never did a redesign, but making the headers parallel was definitely on the to-do list.
54  Using Arduino / Audio / Re: MSGEQ7 function without delay statments on: January 17, 2013, 03:06:56 am
The delays matter because the MSGEQ7 decays the stored values a certain amount each time you strobe through. If your other code takes varying times to run, then your results from the MSGEQ7 will not be consistent.
55  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 17, 2013, 02:46:02 am
I know about the TSSOP, but it's actually way too big for my application.
56  Using Arduino / LEDs and Multiplexing / Re: MegaBrite RGB on: January 17, 2013, 02:43:52 am
Me. They're...fun!
57  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 14, 2013, 10:23:28 pm
Oh weird, I didn't notice that "binarygod" actually deleted everything. That's really antisocial.
58  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 14, 2013, 10:21:49 pm
Short for PCB and Assembly shop.
59  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 14, 2013, 10:07:10 pm
I am very slowly designing a 4-layer board with some AS1130's. The biggest pain has been finding out that my usual cheap PCBAs don't want to do 0.5mm BGA/WLCSP.
60  Using Arduino / LEDs and Multiplexing / Re: AS1130 Ongoing Discussion 132 Individually controllable, PWM LED driver on: January 12, 2013, 05:44:13 pm
Probably accidentally got it working right, and dropped this thread like a hot potato.
Pages: 1 2 3 [4] 5 6 ... 83