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