ac_ulr
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ac_ulr [2013/09/19 10:54] antichambre [Introduction] |
ac_ulr [2016/05/16 11:09] 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. | ||
| - | |||
| - | 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]] | ||
| - | ... | ||
ac_ulr.txt · Last modified: 2016/05/16 11:09 by antichambre
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