digitalRead()

Input/Output and Analog/Digital I/O Comparison

Pins in the Arduino controller can be configured as inputs or outputs. Additionally they can be either an analog or digital signal. The following table summarizes this variation and the commands used for each.

Reads the value from a specified digital pin, either HIGH or LOW.

Note: If the pin isn't connected to anything, digitalRead() can return either HIGH or LOW (and this can change randomly).