Arduino - Exercise 5 Simple Digital Input

Select one. Digital inputs .....

• can be one of three states, HIGH, LOW and MIDDLE

• can turn on LED's

• can be only one of two states, HIGH or LOW

• Can be a wide range of values.

True or False. We use a pull down resistor for digital inputs to ensure the input is held LOW when the switch is off.

• True

• False

A constant is ....

• A number that changes

• A number that stays the same

• A number that is always 0

A variable is ....

• A number that changes

• A number that stays the same

• A number that is always 0

Which command is correct for initialising pin 7 as an INPUT.

• pinmode (7, OUTPUT);

• pinMode (7, INPUT);

• pinMode (7, INPUT)

• pinmode(7, HIGH);

Which command would read the digital input on pin 7?

• digital read (7, INPUT);

• digitalRead(7, INPUT)

• digitalRead(7,INPUT);

• digitalRead(7, OUTPUT);

If digital input pin 4 was LOW and we wanted the variable 'switchstate' to store that value, which is the correct command.

• switchstate = digitalRead (4);

• switchstate = digitalRead (7);

• switchstate = digitalRead (4)

• switchstate = digitalread (4);

If the switch connected to digital pin 3 was on, what would the value of the variable 'switchstate' be in the command

switchstate = digitalRead(3);

• HIGH

• LOW

• MIDDLE

• This command is written incrrectly.

If the switch connected to digital pin 8 was off, what would the value of the variable 'switchstate' be in the command

switchstate = digitalRead(3);

• HIGH

• LOW

• Unsure as its reading pin 3 not pin 8

• This command is written incorrectly.

What does the 'else' command do?

• Nothing

• Always does the else commands even if the previous 'if' statements were true

• Only does the else commands if none of the other 'if' conditions were true