Are you searching for a flight controller and you are “new” to the RC modeling? Do you want to skip the part of days of calibration and hardcore programming? Well then the best choice for you is to start with one of the very famous flight controllers – KK 2.1.x from HobbyKing. You can find it here.
What actually is a flight controller?
Its purpose is to stabilize the aircraft during flight and to do this, it takes signals from on-board gyroscopes (roll, pitch and yaw) and passes these signals to the Atmega324PA processor, which in-turn processes signals according the users selected firmware (e.g. Quadcopter) and passes the control signals to the installed Electronic Speed Controllers (ESCs) and the combination of these signals instructs the ESCs to make fine adjustments to the motors rotational speeds which in-turn stabilizes the craft.
After that been said, this is a great start for people who are new to the process of building a new multi copter. Probably the hardcore enthusiasts will choose something else due to the missing GPS. Its price is very affordable and it is worth every cent. It is really doing a great job for stabilizing your aircraft. You can calibrate the accuracy from a level where it helps you a lot to a level where you can control almost every aspect of the machine. ( This will allow you to make different figures in the air )
If you are building a big model, you won’t have a problem to find space for it, but if you are building something mini, then you can choose the smaller brother of the KK 2.1.5. It has everything that the big brother can offer but in a much smaller package. I personally bought the small controller. It is only 3cm in width and height. I am building a relatively big model but that doesn’t matter. The quality isn’t different. You have less input pins but they cover everything you can do with the normal KK board.
What else is important?
Well as everything that run some kind of software you should know that the this board receives updates. Hopefully you don’t crash and destroy yours for let say 6 months. It will be a good idea if you check at some point for newer version of the software. Personally found out that the new version improve the stability by fixing bugs and adding new algorithms for working with the gyro and the accelerometers.