Some instructions for connecting Mini (MultiWii Control) MWC Flight Control Board to a computer.
The device at the top of picture below is the board . Bought it from HobbyKing. Here is the
link.
You might so able to find it
here for cheaper price with same quality.
The one at the bottom of the picture is FTDI which is used for connecting the Control Board to computer. As you can see it has an USB on the left.
The FTDI is used for connecting the board to your computer so that you can
configure and trim the board controls settings via GUI software, and flash other multicopter
firmware into the board via Arduino software.
See
how to calibrate the ESCs
and how to
upload and configure MultiWii program
Here is a mini micro 4 pin 1.25 T-1 JST connector cable for connecting between the Control Board and the FTDI.
If you look closer in the picture below, you can see pin to pin connections. I have green as ground, yellow as 5V or power (PWR), black as RXD (board side) or TXO (FTDI side), and red as TXD (board side) or RXI (FTDI side).