YKS ArduPilot APM 2.6 Flight Controller Board w/ Side-Pin Connector for RC Quadcopter Multicopter Includes both right angle and straight pins for I/O, allowing user to customize as needed. Includes 3-axis gyro, accelerometer and magnetometer, along with a high-performance barometer. Barometric pressure sensor upgraded to MS5611-01BA03, from Measurement Specialties. Onboard 16Mbit Data flash chip for automatic data logging. Atmel's ATMEGA2560-16AU and ATMEGA32U-2 chips for processing and USB functions respectively. One of the first open source autopilot systems to use Invensense's 6 DoF Accelerometer/Gyro MPU-6000. Digital compass powered by HMC5883L chip, included on the main board.