ac_ulr
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ac_ulr [2013/09/02 11:37] antichambre [Introduction] |
ac_ulr [2013/09/20 09:45] antichambre |
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| The goal: | The goal: | ||
| * 20mm diameter ring. | * 20mm diameter ring. | ||
| - | * 32 matriced Leds on SR. | + | * 32 matriced bicolor Leds on SR with PWM support. |
| - | * 26mm between 2 rings for 16 to fit in a 19" rack. | + | * Width<27mm between 2 rings for 16 pots or encoders to fit in a 19" rack. |
| - | * For encoders and potentiometers 270° and 300°. | + | * Support encoders and potentiometers 270° and 300°. |
| * Low profile for integration facility. | * 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:\\ | Autocad design rendering:\\ | ||
ac_ulr.txt · Last modified: 2016/05/16 11:09 by antichambre
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