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Digital I/O pins
Just like any Arduino board, the D1 Mini module has digital input/output pins or
GPIO - General Purpose Input/Output pins. As the name implies, it can be used
as digital inputs to read a digital voltage, or as digital outputs to output either
0V (sink current) or 3.3V (source current).
The D1 Mini module has a microcontroller that operate in voltager range of 0V
– 3.3V.
The maximum current that can be drawn from a single GPIO pin is 12mA!
NOTE: The pins of the D1 Mini module are not 5V tolerant, applying more
than 3.6V on any pin could damage the chip!
GPIO1 and GPIO3 are used as TX and RX of the hardware Serial port (UART),
so in most cases, it can not be used as a normal I/O while sending/receiving
serial data.
D1 Mini module has one built-in LED connected to the GPIO2 pin.
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