Firstly if it can be done I'd probably do it to mine, just bc I like to do things to it. Funny as it sounds I like using a magnifying glass to solder hair thickness wires & grains of filtered sand components.

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I'm pondering is if I should make the 4 RGB LEDs for the knob a single addressable location or seperate

Personally speaking a single location would be just fine, no reason to make it more complicated than it already sounds.

Oh, you've got to make them separate. We could have funky circular effects then!

I thought about doing something like this a couple of years back, but never got time to get past the dreaming about it stage. Those tiny leds weren't available then either,

n2toh, welcome back to the boards. I've enjoyed reading your recent flood of empeg ideas. You never know when one of those ideas will catch on and become reality.

I know nothing about electrical engineering and next to nothing about empeg coding. So, I'll just cheer you on and hope that you get something worked out. Good luck.

Haha, Simon on the empeg, using the default beeps as tones. I'd probably shatter my display board from over reacting and slamming the buttons too wildly.

Is there anything in the empeg that can be used as an SPI interface?

Update on the RGB+UV buttons project.

I'm doing a bit of research on how to implement the LED drivers, This is what I have so far.

possible solutions for driving the LEDs required.

1. a TI TLC5940 or TLC5941(this 12 bit PWM allows the most control over each LED, but uses an SPI interface)
2. a Philips PCA9532 (only 8 bit PWM and it has an i2c interface.)
3. a Maxim MAX6964 (only 8 bit PWM and worse the top 4 bits are global to all LEDs, but also has an i2c interface.)
4. use an ATMEL uC (this requires coding and debugging and is limited to 10 bit PWM on most chips.)
5. a Philips PCA9533; 4-bit I²C LED dimmer (this is only a 4 channel driver)

solution 1 requires a chip to convert i2c to SPI.
solutions 1,2,3 require two chips to control 32 LEDs, omitting the UV LEDs would allow a single chip solution and the knob to be controlled as a single location.

solution 4 may be done with one chip, but a two chip solution solves the ISP problem.
solution 5 would control all locations at once, also like colors need to be wired in series.)

I wonder if any of the Ring'O'Lights technology would be useful here. Does anyone know how how those are normally driven?

-ml

What are the available addresses on the I2C bus in the empeg?