Electronics Interactive LED wall art. (understood and under construction)

Hello again all.

I'm taking on yet another project, one I couldn't resist after seeing the video below:


After hunting around on the Evil Mad Scientist Laboratories website I found an example circuit diagram and building instructions.

I was hoping that someone could help me make some sense of the diagram below. Perhaps put it into lamens terms for me. I have a bit of hobbiest level electronics experience, but I've never taken on a project like this before.

Here is the circuit diagram, which I understand for the most part, I was just hoping someone could offer up a wiring diagram to help me better understand.

The project called for 16 of these circuits in a 1-D topology (whatever that means)


They took some pics of the circuit as well - simple enough, I just have a bit on confusion identifying which wires correspond with which:



When complete it should start to look something like this (hopefully I can do a better job of wire management).


Any help that you lot can offer would be a great benefit, I don't have much experience with making my own IC circuits... outside of some basic arduino projects.

Thanks in advance.

 

Let us know how you progress.
I for one would like to do the same, but my experience with IC's is seriously lacking.

 

i was going to do this for my final project at school but whent with a picaxe controled LCD insted. im thinking about taking another run at this. (it would make one of the most bad ass beer pong tables)

 

Thanks guys, I spent some time today examining the circuit and I now grasp it in it's entirety (almost... I'll ask these questions tonight after I post my diagram). Thanks for those who lent a hand.

I'm ordering the parts to begin construction today, should be able to throw it together in <1months time.

My plan is to use frosted glass so that you don't see the circuits and so you'll only see the glow of the lights.

I'd be interested in fabricating these for purchase if there is enough demand.

 

they do sell full kits on there site, but im willing to bet yours will be a lot cheaper.

 

Theirs are something like $90 for one circuit, the table requires 16 of these... that's absurd IMO for something that uses <60$ in circuit components.


Okay, I've redrawn the diagram to be more user friendly (at least I can understand it better now).
click for big


I have a few questions for the electronic experts among us:
1 - On the Chip there are V+ and V- pins... what voltage do I apply to these when using 15V to power the LEDs?

2 - There is also a demand for a second power source of -15V, what does this mean? How do I get negative voltages?

3 - Can anyone suggest some inexpensive power supply units that can power the +15V, -15v, and the mystery IC voltage pins?

4 - Can anyone see any problems with my diagram, or is it all tickity-boo?

5 - For circuit number 1 in the 16 circuit series, do I simply ignore the "IN FROM NEIGHBORS" section? the same question for the last in the series, do I ignore the "OUT TO NEIGHBORS" output? Or is there something that I need to take into account?

THANKS so much in advance, for helping me realize this vision.

 

To help a bit further here are the specs of the IC's I'll be using:

LF347
Gain Bandwidth: 4 MHz
Channels: 4 Channels
Input OutputType: Vcm to V+, Not R-R Out
Slew Rate: 13 Volts/usec
Supply Min: 8 Volt
Supply Max: 36 Volt
Offset Voltage max, 25C: 10, 5 mV
Supply Current Per Channel: 1.8 mA
PowerWise Rating 2: 450 uA/MHz
Internally trimmed offset voltage: 5 mV max
Low input bias current: 50 pA
Low input noise current: 0.01 pA/SqrtHz
Wide gain bandwidth: 4 MHz
High slew rate: 13 V/µs
Low supply current: 7.2 mA
High input impedance: 1012
Low total harmonic distortion: <=0.02%
Low 1/f noise corner: 50 Hz
Fast settling time to 0.01%: 2 µs

 

BreeSpree from XtremeSystems has suggested that it be a wall mounted art piece... which I LOVE.

I've decided to make a picture style interactive panel - instead of a table (or perhaps in addition to the table).
I'm thinking of using perforated aluminum with LEDs poking though the holes to accomplish this, detailed in a nice metal frame.

The goal here is to make an interactive picture that will light up when you walk past, and also allow you to stand and play with it.


Slight change to the circuit design as well - as per the suggestions of Mohonri over at [H]ard Forum.

 

Thats pretty neat. The only thing I dislike about it is that its a bit slow. If it could sense things faster and have the ripples would fade faster I think the affect would be more impressive. I say this because when the cat was on the table it seemed like it wasn't reacting correctly....you would see no reaction when the cat pounced sometimes, but then a big reaction when it pounced again. That being said though its still pretty dang cool - I would love to be able to make one myself.

 

in an atempt to help out

Vcc+ and Vcc- will be according to your specs any ware between 8 and 36 volts (withc seems rather high) those are your supply pins with out them your chip will not function.

 

Thanks guys, I got it all figured out now. I've changed the design slightly again as well - repost the schematic tonight.

@twentynine - What you describe is not a reaction speed thing it's a sensor thing. When the cat moves and there is no change its because the cat didnt trip a sensor. I'll be using more sensors in a different distribution pattern to help with this. I'm also using a different mounting configuration to eliminate the photodiode sensor from being activated by the LEDs around it.

I'll be using 30 sensor circuits, instead of 16.
Each powering 24LEDs each, instead of 28.
I'll be comparing the light values to 6 neighbors, instead of 2.
The result is a more accurate design using 720LEDs, instead of 448.

 

Now are the sensors motion sensitive or light sensitive? From the video it looks as if it is light.

 

The circuit calls for light sensitive photodiodes.

 

Im gonna see how you do on this project then i may just start on a wall mounted on of these things as it would look SICK in my uni portfolio!

Curtain Up!

 

Just starting our GCSE electronics coursework at school so I could suggest this although personally I'm doing a fan controller with temp/voltage bars.

 

this table reminds me a lot of the led throwies from G.R.L. check out some of there stuff http://graffitiresearchlab.com/

 

I wanted to make one of these. Like a small 2x2 foot end table doing 8 of those sensors.

 

Ah. Thank you for clearing that up. Haha. I have very little experience in doing this type of work so I used the words which seemed to fit for me. But I eagerly await your version. I know it'll turn out amazing.

Oh and lots of pictures and videos area must!

 

Thanks guys!

Heres the latest revision. I think there are still a couple errors. I dont quite understand the powering the opamp part.

 

what dont you get about powering the opamp?