I am writing a autopilot system on BeagleBone Black(BBB). However if I were to write a PID system for the low level controls and sensor data acquisition, it would take too much time for a simple project. So I am beginning to look into flight controllers, what is a decent & cheap one you guys would recommend? I am looking into KK 2.1 and APM 2.6, but obviously APM2.6 is a lot more expensive. Does KK 2.1 have pin-in with simple control interfaces like up/down/forward/back/turn etc?
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