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Update Sonoff 4CH docs (#1209) 

* Update Sonoff 4CH docs

Swap RX/TX in pin list and add a warning about connecting some pins to GND on boot
Tested with `SONOFF 4CH R3 V1.1 2020-04-13`

* Make the warning less intrusive :)
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Pavel Skuratovich 2021-06-02 21:09:34 +03:00 committed by GitHub
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devices/sonoff_4ch.rst
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@ -211,13 +211,17 @@ of the basic functions.
---------------------------------------- -----------------------------------------
``GPIO13`` Blue LED (inverted)
---------------------------------------- -----------------------------------------
``GPIO1`` ``RX`` pin (for external sensors)
``GPIO1`` ``TX`` pin (for external sensors)
---------------------------------------- -----------------------------------------
``GPIO3`` ``TX`` pin (for external sensors)
``GPIO3`` ``RX`` pin (for external sensors)
---------------------------------------- -----------------------------------------
``GPIO2`` ``IO2`` pin (for external sensors)
======================================== =========================================
.. note::
The ESP8266 will be prevented from booting if the following pins are pulled LOW (connected to GND) on cold startup: ``GPIO0``, ``GPIO1``, ``GPIO2``. Be prepared if you want to use them for input sensors.
.. code-block:: yaml
esphome: