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docs/esp8266: Mention Signal in GPIO section of quickref.

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Mike Causer 2021-04-30 15:54:28 +10:00 committed by Damien George
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docs/esp8266/quickref.rst
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@ -138,6 +138,10 @@ Also note that Pin(16) is a special pin (used for wakeup from deepsleep
mode) and may be not available for use with higher-level classes like
``Neopixel``.
There's a higher-level abstraction :ref:`machine.Signal <machine.Signal>`
which can be used to invert a pin. Useful for illuminating active-low LEDs
using ``on()`` or ``value(1)``.
UART (serial bus)
-----------------