NodeMCU ESP8266 =============== .. seo:: :description: Instructions for using nodemcu ESP8266 boards in ESPHome together with a description of their pins and uses. :image: nodemcu_esp8266.jpg :keywords: NodeMCU, ESP8266 The NodeMCU board is fully supported by ESPHome. Simply select ``ESP8266`` when the ESPHome wizard asks you for your platform and |nodemcuv2|_ as the board type. .. note:: Most NodeMCU that can be purchased now are version 2 or upwards. If you're using an original v1 board, set the board type to |nodemcu|_. .. |nodemcuv2| replace:: ``nodemcuv2`` .. _nodemcuv2: http://docs.platformio.org/en/latest/platforms/espressif8266.html#nodemcu .. |nodemcu| replace:: ``nodemcu`` .. _nodemcu: http://docs.platformio.org/en/latest/platforms/espressif8266.html#nodemcu .. code-block:: yaml # Example configuration entry esphome: name: livingroom platform: ESP8266 board: nodemcuv2 The NodeMCU's pin numbering as seen on the board (the ``D0`` etc pins) is different from the internal pin numbering. For example, the ``D3`` pin number maps to the internal ``GPIO0`` pin. Fortunately ESPHome knows the mapping from the on-board pin numbers to the internal pin numbering, but you need to prefix the pin numbers with ``D`` as in the image below in order for this automatic mapping to occur. In general, it is best to just use the ``D0``, ``D1``, ... pin numbering to avoid confusion .. figure:: images/nodemcu_esp8266-full.jpg :align: center Pins on the NodeMCU ESP8266 development board. Note that in certain conditions you *can* use the pins marked as ``INTERNAL`` in above image. - ``D0`` also can be used to wake the device up from :doc:`deep sleep ` if the pin is connected to the ``RESET`` pin. ``D0`` is additionally connected to the LED next to the UART chip, but in an inverted mode. - ``D3``, ``D4`` and ``D8`` are used on startup to determine the boot mode, therefore these pins should not be pulled low on startup. You can, however, still use them as output pins. - ``A0``: This pin can be used as a normal GPIO pin (like ``D1`` etc) but additionally can measure voltages from 0 to 1.0V using the :doc:`/components/sensor/adc`. - ``VIN``: This board can be powered by an external power supply by using this pin. Supply a voltage depends on the board you use. Some boards support up to 12V, some up to 5V. - ``ENABLE``/``RESET``: When these pins are triggered, the board resets. The difference between the pins is how they can handle voltages above 3.3V. .. code-block:: yaml # Example configuration entry esphome: name: livingroom platform: ESP8266 board: nodemcuv2 binary_sensor: - platform: gpio name: "Pin D0" pin: D0 See Also -------- - :doc:`esp8266` - :doc:`nodemcu_esp32` - :ghedit:`Edit`