[sdiy] Rotary encoders...

[John Loffink]

Matrix/pulsed driving of LEDs is quite common in synthesizers with large LED
counts.  I don't know how Nord does it though.

 

John Loffink

The Microtonal Synthesis Web Site

http://www.microtonal-synthesis.com

The Wavemakers Synthesizer Web Site

http://www.wavemakers-synth.com

 

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Grant Richter
 


My guess is the LEDs have to be networkable with a serial protocol. Perhaps
I2C port expanders at each encoder for the ring of LEDs. I count 15 LEDs per
encoder, that would fit with existing 16 pin expanders. I wonder what the
16th pin is being used for? Perhaps color control?

Of course each encoder/LED group could have PIC for itself, there would be
advantages to having each control have it's own intelligence. Networking and
low latency updating (transmit on knob movement) come to mind.


 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20040218/896279ce/attachment.htm>