/products/raspberry-pi/b/blog/posts/lots-of-i-o-s-on-your-raspberry-pi-optically-coupled-and-long-wires-possible-kunioDear reader, We launched a Indiegogo campaign where we offer a series of digital I/O modules : http://igg.me/at/kunio Via an SPI bus + some I/O pins, or just up to 7 simple I/O pins, you can add a huge number of digital in- and outputs in a...en-USTelligent Community 12