[Ken Olsen] needed a bunch of analog inputs for his model railroad project. He wanted to use the Raspberry Pi board, but alas there are no analog inputs available on the GPIO header. But there is SPI.

One of the biggest problems with home automation is trying to interface with old or analog devices. Do you upgrade the device just so you can automate it? Or do you find a workaround like [Seb] did?

Platforms like Raspberry Pi are great for prototyping, but what do you do when you want to take the product to production? Coming up with a custom design is one approach. However, a more flexible ...