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====== Universal Led Ring ======

===== Introduction =====
Cause i can not find precise led ring.\\
There's no existing solution to get 16 pots in line with its rings which fits in a 19" rack face.\\
So i tried to design it.

The goal:
   * 20mm diameter ring.
   * 32 matriced bicolor Leds on SR with PWM support.
   * Width<27mm between 2 rings for 16 pots or encoders to fit in a 19" rack.
   * Support encoders and potentiometers 270° and 300°. 
   * Low profile for integration facility.
   * No component on top side except leds.

How:\\
I need to drive 32 leds, 4*8. The trick was to find a register which has 12 ouputs and compatble with SR line(DOUT).
The <wrap download>[[http://www.nxp.com/documents/data_sheet/HEF4894B.pdf|NXP HEF4894B]]
</wrap> was made for it, i's a 12-stage shift-and-store register, its operation is very similar to that of the 74HC595(serial I/O, serial clock, parallel load) except that it has a strobe input for PWM function.\\

Autocad design rendering:\\
{{:antichambre:design_render_002.jpeg?450|Top}}{{:antichambre:design_render_003.jpeg?450|Bottom}}


In fab at [[http://oshpark.com|Osh Park]]
...

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