Connectors
===============
Most of these connectors are unused since they are just options if wanted/needed. Only P3 and P2 connecters are used to connect HD44780-LCD using parallel to I2C board (link here).
This I2C- connector also uses onboard pullups, so this device pullup resistors are unassembled.

.. image:: connectors.png
  :width: 400
  :alt: Connectors