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Difference between revisions of "LedFloor"

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(Solution #4)
(Led Floor : on/off or pwm ?)
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** a system to control each diode (or group of diodes) independantly
 
** a system to control each diode (or group of diodes) independantly
 
** that is not too expensive
 
** that is not too expensive
 +
 +
Question: do we need on/off for each led, or more advanced modes (eg PWM for various intensities).
 +
* on/off:
 +
** is simpler as regard to schematics
 +
** is simpler as regard to driving code (led bits per image, obviously)
 +
** isn't as cool
 +
** can still, to some extend, allow some variable intensities
 +
PWM "natural" ability is prefered, but choice will be made depending on total cost of solution.
  
 
== Solution #1 ==
 
== Solution #1 ==

Revision as of 22:24, 3 February 2011

Led Floor

How to turn the 11 windows of the hacklab into a big led display ?

  • what have we got to do it ?
    • Windows that are H189xW95.5 centimeters
    • 1000 red leds
    • loads of RJ45 and old IDE/SCSI/floppy buses
  • what we need ?
    • a system to control each diode (or group of diodes) independantly
    • that is not too expensive

Question: do we need on/off for each led, or more advanced modes (eg PWM for various intensities).

  • on/off:
    • is simpler as regard to schematics
    • is simpler as regard to driving code (led bits per image, obviously)
    • isn't as cool
    • can still, to some extend, allow some variable intensities

PWM "natural" ability is prefered, but choice will be made depending on total cost of solution.

Solution #1

use a TLC5940NT that can control about 16 LED each

Solution #2

use the snootlab's i2c led driver solution that can control 16 LED each

  • 64*i2c led driver = 9.95*64 = 636.80
  • 1*i2c shield = 17.95
  • 1 ardunio = 20
  • O(price) = 674.75 euros

Solution #3

  • use shift registers... ?

Solution #4

use two Peggy 2 board :

  • 2* http://evilmadscience.com/tinykitlist/157
  • O(price) = 95*2 = $180 --or far less as you won't need the giant PCB. They have a "parts kit" that includes the 328 and the IC's for $15. you'd still need LED's and transistors and other support components. --cw

looking at the peggyLE schematics, they are not using several of the outputs, it looks like a 32x30 grid is possible with the IC's included, and by adding another IC in place of the buttons 32x45 is possible. --cw

Solution #5

  • Check with Electrolab, where another similar project is ongoing :-)

Solution #6

  • 42 ?