I have a QBrain 4x25A ESC and a kk2.1 HC multi-rotor control board. I got these parts second hand and I can't seem to figure out how to use them. On the QBrain there are 4 wires S1, S2, S3, S4. I have no clue what those do and what they are connected to. I'm also missing the programmer for the kk 2.1 control board and so I will probably need referrals to another controller.
any help would be appreciated!!
any help would be appreciated!!