Detailed includes(Cables for accessories are JST to DF13 cables which are compatible with old pixhawk accessories, such as Telemetry, Power Brick or GPS):
To take full advantage of the Pixhawk 2.1, Please add the new GPS with built in Safety switch.
Pixhawk 2.1, Pixhawk 2.1 + GPS Here, Pixhawk 2.1 EDISON + GPS Here
pixhawk2 user manual
Key design points• All-in-one design with integrated FMU and IO and lots of I/O ports.• Improved manufacturability, designed for simpler mounting and case design.• Separate power supplies for FMU and IO (see power architecture section).• On-board battery backup for FMU and IO SRAM / RTC.• Integration with the standard power brick.Pixhawk FMU Main Board• STM32F427; flash 2MiB, RAM 256KiB.• On-board 16KiB SPI FRAM• MPU9250 or ICM 20xxx integrated accelerometer / gyro.• MS5611 Baro• All sensors connected via SPI.• Micro SD interfaces via SDIO.Vibration Damped IMU board• LSM303D integrated accelerometer / magnetometer.• L3GD20 gyro.• MPU9250 or ICM 20xxx Gyro / Accel• MS5611 Baro• All sensors connected via SPI.I/O ports• 14 PWM servo outputs (8 from IO, 6 from FMU).• R/C inputs for CPPM, Spektrum / DSM and S.Bus.• Analogue / PWM RSSI input.• S.Bus servo output.• 5 general purpose serial ports, 2 with full flow control• Two I2C ports• One SPI port (un-buffered, for short cables only not recommended for use).• Two CAN Bus interface.• 3 Analogue inputs• High-powered piezo buzzer driver. (On expansion board)• High-power RGB LED. (I2C driver compatible Connected externally only)• Safety switch / LED.