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Add strapping pin information to FAQ (#1576) 

Co-authored-by: Otto Winter <otto@otto-winter.com>
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Martin 2021-11-12 11:04:44 +01:00 committed by GitHub
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guides/faq.rst
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@ -351,6 +351,16 @@ The top level ``name:`` field in your .yaml file defines the node name(/hostname
Important: follow these `instructions </components/esphome.html#changing-esphome-node-name>`_ to use the ``use_address`` parameter when renaming a live device, as the connection to an existing device will only work with the old name until the name change is complete.
Why am I getting a warning about strapping pins?
--------------------------------------------------
The ESP chips have special "strapping pins" that are read during the bootup procedure and determine how it boots up. They define whether the ESP boots into a special "flashing mode" or normal boot and a couple of other internal settings.
If an external pullup/down changes the configured voltage levels boot failures or hard to diagnose issues can happen.
While the use of them in software is not a problem, if there's something attached to the pins (particularly if they're not floating during the bootup) you may run into problems.
It's recommended to avoid them unless you have a pressing need to use them and you have reviewed the expected boot voltage levels of these pins from the ESP datasheet.
Note that some boards connect pins such as GPIO0 to a builtin tactile switch. In these cases using the strapping pins is not a problem.
See Also
--------