Arduino (leds, signs, on & off)

Cathode is:

• A) Positive (+)

• B) Negative (–)

Anode is:

• A) Positive (+)

• B) Negative (–)

Which leg of the LED is the cathode and which one is the anode?

• A) Short leg = Cathode, Long leg = Anode

• B) Short leg = Anode, Long leg = Cathode

What does delay() do, and delay(1000) means seconds or milliseconds?

• A) It speeds up the program; delay(1000) means seconds

• B) It pauses the program; delay(1000) means milliseconds

For an LED, which one is correct?

• A) pinMode(led, OUTPUT)

• B) pinMode(led, INPUT)

If I need to turn ON an LED, what code should I use?

• A) digitalWrite(led, LOW)

• B) digitalWrite(led, HIGH)

If I need to turn OFF an LED, what code should I use?

• A) digitalWrite(led, HIGH)

• B) digitalWrite(led, LOW)

If I need to blink an LED, what code should I use?

• A) Turn it ON, wait, then OFF, wait again (repeat)

• B) Only turn it ON once, no wait

What does a resistor do?

• A) Increases current

• B) Limits current

What’s the difference between void setup() and void loop()?

• A) setup() runs once, loop() runs continuously

• B) Both run only one time