[lucasmpr]

Originally Posted by Cambion

Using https://www.mobileread.com/forums/sh...643&styleid=19 as a reference I put together this:



Sorry, I am not the best with hardware hacking so bare with me but does this seem ok?

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This is wrong. Your voltage divisor should be with the ground.

RX -> Resistor -> Resistor -> GND. It will work for the Rpi -> Kindle but not in the reverse order as you have to up the tension. It might work though.

The safest way to go is using a Level Shifter.

Edit: Looks like it was a revived post. Blah....