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docs/esp32: Mention Signal in GPIO section of quickref.

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Mike Causer 2021-04-30 15:57:20 +10:00 committed by Damien George
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docs/esp32/quickref.rst
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@ -171,6 +171,10 @@ Notes:
* The pull value of some pins can be set to ``Pin.PULL_HOLD`` to reduce power
consumption during deepsleep.
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)
-----------------