forgive my completely noob question, I'm well aware that it is, but I need to be sure before I power this thing up.
I need to talk serial between a Rasbperry Pi B+ and an UNO. 3.3v on one side, 5v on the other. I went with the adafruit level shifter which is utilizing the TXB0108 chip. http://www.adafruit.com/product/395
Enter the stupid question: The chip only has a single ground, so am I supposed to carry the ground common between the Raspberry Pi and the arduino?
This is how I have thus far planned to wire it if so, but please somebody yell out if I should stop from plugging it in.