Andoer CC3D Openpilot Open Source Flight Controller Board 32 Bits Processor for QAV250 C250 250 Quadcopter Powerful STM32 32-bit microcontroller running at 90MIPs with 128KB Flash and 20KB RAM. 3-axis high-performance MEMs gyros and 3-axis high-performance MEMs accelerometer. Tiny 36mmx36mm 4 layer PCB for superior electrical noise reduction and flight performance. Direct high speed USB support with no drivers required, a truly plug and play device. Search EverTrust for more choices!