I'm learning more as i experiment, so I will update here when I overcome things...I found my multimeter, plugged the USB to serial board into my computer and notice voltages as follows on the pins:
RX = 2.9v
TX = 3.3v
I'm not sure why these are different, I was expecting 3.3v on both pins.
If I set the jumper to 5v there is a similar slightly lower voltage on the RX pin. I'm expecting the voltages to drop on all pins once I have the LDO in place.
I have decided not to order the cable for now since I have almost all the parts, but I will probably still use the sewing pin technique to connect to the kindle.
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