Digital Inputs and Outputs Quiz

What type of signal represents data as a sequence of discrete values?

• Continuous signal

• Binary signal

• Analog signal

• Multivalued signal

In digital circuits, how many possible valid values can a signal have?

• Three

• Two

• One

• Four

What is the purpose of a pull-down resistor in a circuit?

• To increase resistance

• To connect to 5 volts

• To connect to ground

• To control the LED brightness

Which Arduino function is used to read the state of a pushbutton?

• digitalWrite()

• analogRead()

• pinMode()

• digitalRead()

What is the purpose of the INPUT_PULLUP mode in Arduino?

• To disable pull-up resistor

• To disable digital pins

• To enable analog pins

• To enable pull-up resistor

What does the tone() function in Arduino do?

• Read analog sensors

• Control LED brightness

• Generate different pitches

• Enable pull-down resistor

What is the minimum reading of the sensors that generates a note in the tone() function example?

• 15

• 20

• 10

• 5

How many force sensing resistors are used in the three-key musical keyboard example?

• 1

• 2

• 3

• 4

What is the purpose of the 10K ohm resistor in the circuit of the state change detection example?

• To connect to 5 volts

• To provide reference

• To control LED brightness

• To connect to ground

Which pin is the onboard LED attached to in the Input Pullup Serial example?

• Pin 12

• Pin 10

• Pin 8

• Pin 13