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Across
  1. 3. What specific Arduino programming function is called to read the electrical state of an input pin?
  2. 4. What specific Arduino programming function is called to read the electrical state of an input pin?
  3. 5. To what voltage source or rail does a pull-down resistor connect a digital pin to ensure a clean 0V reading?
Down
  1. 1. What binary state or logic level does a microcontroller receive when a correctly wired pull-up button is left unpressed?
  2. 2. What type of mechanical switch only stays active while your finger is physically pressing it down?