Uno as usb to serial, need to bring down voltage

DrAzzy:
$50 for level converter? What planet are we on?

They should be like 50 cents on ebay...

He's in Australia apparently.

Anyway, they're charging $26 USD for a FTDI 3.3V breakout board. I'm guessing that is what the OP is not buying. $15 USD for a FTDI 5V breakout board.

MicroFTX is the breakout board the OP needs to replicate