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ac_ulr [2013/09/20 09:45] antichambre |
ac_ulr [2016/05/16 11:09] (current) antichambre [Introduction] |
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====== Universal Led Ring ====== | ====== 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]] | ||
- | ... | ||