Function: Flight controller board, control multicopter or fixed-wing flight Features: - Arduino Compatible - Can be ordered with top entry pins for attaching connectors vertically, or as side entry pins to slide your connectors in to either end horizontally - Includes 3-axis gyro, accelerometer and magnetometer, along with a high-performance barometer - Onboard 4 MegaByte Dataflash chip for automatic datalogging - Optional off-board GPS, uBlox LEA-6H module with Compass. - One of the first open source autopilot systems to use Invensense's 6 DoF Accelerometer/Gyro MPU-6000. - Barometric pressure sensor upgraded to MS5611-01BA03, from Measurement Specialties. - Atmel's ATMEGA2560 and ATMEGA32U-2 chips for processing and usb functions respectively.
Had trouble the first time I tried to connect to APM. Turns out not all USB cables have all the wires, some are power only. Try a USB DATA/SYNC cable and confirm all the pins connect at both end by 'ringing' it out with an ohm meter before you give up.