I would like to be able to make a string of buttons and combine this with leds.
A lot of led strings use SPI or an SPI like protocol, needing sometimes only 1 dataline or 1 dataline + clock.
https://www.sparkfun.com/products/10312 (WS2801, 1 dataline, 1 clockline, ground, 5V) http://www.insomnialighting.com/products/rgbsmdws2811.html (WS2801, 1 dataline, ground, 5V)
I would like to combine leds in this fashion with a push button and I would like to use a minimal amount of wire.
Any idea if there are any IC's that I can use to make a chain of push buttons (or capacitive touch sensors), with a protocol like SPI or I2C. Of course as inexpensive as possible (I don't want to chain one Arduino for each button). Although maybe an ATtiny85 could be a solution (http://forum.arduino.cc/index.php?topic=126771.0)
I tried to search a bit in the forum, but couldn't find anything. Maybe I'm searching with the wrong terms.
Any idea's are welcome. Thank you in advance.