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current

resistance

capacitance

voltage

a component acts as a power supply for a number of components

the combination of a set of resistive sensors

a component that reduces voltage by a known factor

a circuit that contains resistors connected in series

current

resistance

capacitance

voltage

its frequency

its voltage level

its peak voltage difference

the fraction of time it is high

a literal numerical value

a character

a comment

a string

analogWrite()

digitalRead()

digitalWrite()

tone()

to accept both digital and analog inputs

to allow analog current to be controlled by a digital number

to generate an analog voltage from digital signals

to produce a waveform with an analog frequency