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The datasheet of the Expansion Board is available as a PDF File
The Expansionboard 3 is certified for:
The pinout of the Expansion Board is available as a PDF File
The expansion board contains 7 jumpers labeled:
Note: The internal voltage divider is 1M / 1M, instead of the mentioned values in the pinout. Take care of this when reading the battery voltage.
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.
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
To use the battery, pull
P8/G15high (connect to
3v3). If you want to use the SD card as well, use a 10k pull-up.
On version 3.0:
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
3.3v and if pressed and held while the reset button is pressed on
a Pycom module, the module will enter safe boot.
On version 3.1:
dfu-utilupdate should be performed