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1. LED 1 : Red/green LED used for heartbeat and low-battery indication
2. LED 2 : Blue LED fully lit when powered and blinking when bootloading
3. LED 3 : Blue LED fully lit when powered and blinking when charging
4. LED 4 : Red/green LED used to indicate radio communication
5. Right expansion connector : The expansion port is used to connect expansion boards, either on the top and/or the bottom
6. Left expansion connector : The expansion port is used to connect expansion boards, either on the top and/or the bottom
7. Expansion board orientation indicator : This indicator should match the expansion boards
8. User button : Push button used to power on/off the system. Hold down 3s while powering on to enter bootloader mode. Hold down 10s while powering to enter STM32F4 DFU mode.
9. nRF51822 : The nRF51822 micro controller
10. Mounting holes: Can be used for mechanically mounting something to the platform. The holes are plated, can be grounded by soldering a bridge and are 2mm in diameter (with plating)

Bottom

1. M1 connector : Motor 1 connector
2. M2 connector : Motor 2 connector
3. M3 connector : Motor 3 connector
4. M4 connector : Motor 4 connector
5. STM32F405 debug connector : Connector for debugging the STM32F405 using SWD. For easy access use our debug adapter kit.
6. nRF51822 debug pads : Pads for debugging the nRF51822 using SWD. For easy access use our debug adapter kit.
7. Expansion board orientation indicator : This indicator should match the expansion boards
8. STM32F405 micro controller : The STM32F405 micro controller
9. Right expansion connector : The expansion port is used to connect expansion boards, either on the top and/or the bottom
10. Left expansion connector : The expansion port is used to connect expansion boards, either on the top and/or the bottom
11. Mounting holes: Can be used for mechanically mounting something to the platform. The holes are plated, can be grounded by soldering a bridge and are 2mm in diameter (with plating)