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Expansion Board 3.0

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The datasheet of the Expansion Board is available as a PDF File

ROHS certification


The pinout of the Expansion Board is available as a PDF File

The expansion board contains 6 headers labeled:

  • TX: TX UART communication of the development board
  • RX: RX UART communication of the development board
  • RUN
  • BAT
  • LED
  • CHG: Decrease battery charging current from 450mA to 100mA

Be gentle when plugging and unplugging from the USB connector. Whilst the USB connector is soldered and is relatively strong, if it breaks off it can be very difficult to fix.


Battery Charger

Make sure you check the polarity of the battery before plugging it in! Connect the positive side to the side marked with a +.

The Expansion Board features a single cell Li-Ion/Li-Po charger with a JST PHR‑2 connector. When the board is being powered via the micro USB connector, the Expansion Board will charge the battery (if connected). When the CHG jumper is present, the battery will be charged at 450mA. If this value is too high for your application, removing the jumper lowers the charge current to 100mA.

To use the battery, pull P8/G15 high (connect to 3v3). If you want to use the SD card as well, use a 10k pull-up.

Differences between v2.0 and v3.0

  • The FTDI chip as been replaced with a custom programmed PIC, similar to the

    Pysense/Pytrack/Pyscan boards. This allows our firmware update tool to

    automatically put the module into bootloader mode.

  • Added a “Safe Boot” button to enter more easily into safe boot. This button connects

    P12 to 3.3v and if pressed and held while the reset button is pressed on

    a Pycom module, the module will enter safe boot.


3D model for case design


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