pin：the Arduino pin number.
value：HIGH or LOW.
pinMode(pin, mode)
Description: Configures the specified pin to behave either as an input or an output
Parameter:
pin：the Arduino pin number to set the mode of.
mode：INPUT, OUTPUT, or INPUT_PULLUP.
Control LED via Keys
Analog IO
AnalogRead（pin）
Description: Reads the value from the specified analog pin.
Parameter:
pin：the name of the analog input pin to read
AnalogReference（type）
Description: Configures the reference voltage used for analog input
Parameter:
type
AnalogWrite（pin，value）
Description: Writes an analog value (PWM wave) to a pin. Can be used to light a LED at varying brightnesses or drive a motor at various
speeds. After a call to analogWrite(), the pin will generate a steady rectangular wave of the specified duty cycle until the next call to
analogWrite() (or a call to digitalRead() or digitalWrite()) on the same pin.
P t
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