Level shifter for Pi in documentation

[rdoetjes]

Thanks for your work! I was reverse engineering the FT.COM to see how the Atari Portfolio communicated to actually have a Pi serve files and I came across your awesome work. I learned a lot about the protocol.

However nowhere in your code or documentation do I see you mention that you should use a 5V to 3.3V level shifter for the inputs on the Pi. Sure they "may" survive 5V but they aren't designed for it. A simple voltage divider with resistors would do fine a 1K and 2K resistor would do.

          5V
            |
          R1 (1k)
            |
            ----> GPIO
            |
           R2 (2k)
            |
          GND