Interface board V1 ================== Available connectors on the V1.0 board -------------------------------------- .. image:: ../images/hardware/ems-interface-board-v1-connectors.jpg :width: 500 :alt: EMS interface board connectors .. list-table:: :header-rows: 1 * - Number - J# - Function - Remark * - 1 - J1 - EMS screw terminal - Polarity does not matter. * - 2 - J3 - EMS service jack plug - Only connect either J1 or J3. * - 3 - J2 - Controller UART header - VCC/TX/RX/GND. Input 5V or 3.3V from controller. * - 4 - J7 - Raspberry Pi header - 40-pin header for the Raspberry PI. * - 5 - J5 - 8~16V pin from EMS service jack - Left pin EMS 8~16V DC. Right pin GND. Max power draw 200mA cont. Connecting to the controller ---------------------------- The controller needs to power the interface board. Connect GND as well. Do not supply the interface board with more than 5V. You can connect this board to any 5V or 3.3V compatible UART. This might be on an Arduino, ESP8266 or f.i. a Raspberry Pi. Connect the header J2 to the controller. Connect RX to the RX UART serial port and TX to the TX UART serial port of your controller. If you do not need TX you can just leave the pin unconnected. Warning: If you are using the Raspberry Pi header on the V1.0 board do not connect any 5V to the UART header! See the following pages on how to connect the interface boards to specific microcontrollers.