18 Mar '12, 7pm

@quetwo what about this one? or this? which one do you prefer

There are a lot of people asking questions about this board. Just thought I’d answer a few of them. The build quality here is superb. The wiring does allow you to write individual pins high/low or read analog/digital values from any pin. It uses the analog pins to write/read (1 pin for each muxer chip) and the digital pins to determine which chip you wish to write/read to/from. You cannot operate on 2 different pins on 2 different muxers at the same time. But you can operate on only one pin on one muxer at a time. Unfortunately, the muxer chips have no “latch”. So once you change the operating pins, the value goes back low (for outputs). This shield is great example of expanding your gpio ports, but to be truly useful, we’d probably need a register or something on the other side of the muxers. That said, you could easily connect 6 shift registers with the available pins.

Full article: http://www.sparkfun.com/products/9832

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