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This page has deprecated and moved to the new documentation framework of the main Bitcraze website. Please go to [[https://www.bitcraze.io/documentation/system/]]
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====== Detailed description of the hardware ======
{{:projects:crazyflie2:userguide:legend_top.png|}}
{{:projects:crazyflie2:userguide:legend_bottom.png|}}

** Top **

  - ** LED 1 **: Red/green LED used for heartbeat and low-battery indication
  - ** LED 2 **: Blue LED fully lit when powered and blinking when bootloading
  - ** LED 3 **: Blue LED fully lit when powered and blinking when charging
  - ** LED 4 **: Red/green LED used to indicate radio communication
  - ** Right expansion connector **: The expansion port is used to connect expansion boards, either on the top and/or the bottom
  - ** Left expansion connector **: The expansion port is used to connect expansion boards, either on the top and/or the bottom
  - ** Expansion board orientation indicator **: This indicator should match the expansion boards
  - ** 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.
  - ** nRF51822 **: The nRF51822 micro controller
  - ** 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 **

  - ** M1 connector **: Motor 1 connector
  - ** M2 connector **: Motor 2 connector
  - ** M3 connector **: Motor 3 connector
  - ** M4 connector **: Motor 4 connector
  - ** STM32F405 debug connector **: Connector for debugging the STM32F405 using SWD. For easy access use our [[projects:crazyflie2:development:debug_adapter_kit|debug adapter kit]].
  - ** nRF51822 debug pads **: Pads for debugging the nRF51822 using SWD. For easy access use our [[projects:crazyflie2:development:debug_adapter_kit|debug adapter kit]].
  - ** Expansion board orientation indicator **: This indicator should match the expansion boards
  - ** STM32F405 micro controller **: The STM32F405 micro controller
  - ** Right expansion connector **: The expansion port is used to connect expansion boards, either on the top and/or the bottom
  - ** Left expansion connector **: The expansion port is used to connect expansion boards, either on the top and/or the bottom
  - ** 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)