Arduino Functions and Circuits Quiz

What is the purpose of the pinMode() function in Arduino?

• To set a pin as input or output

• To initialize the LED

• To connect the LED to the ground

• To send a signal to the LED

What does the digitalWrite() function do?

• It reads the status of the LED

• It sets the voltage level of the specified pin to HIGH or LOW

• It turns off the Arduino board

• It loops the code until the LED is on

How long will the red light stay on in the traffic light program?

• 5 seconds

• 10 seconds

• 2 seconds

• 3 seconds

What is the purpose of using a resistor with the LEDs in the circuit?

• To increase the voltage to the LED

• To limit the current going to the LED and prevent damage

• To make the LED brighter

• To help the Arduino recognize the LED

How do you make an LED blink in the program?

• Use the delay() function inside a loop

• Use the pinMode() function

• Use the analogWrite() function

• Connect the LED to a switch

What would happen if you did not use the resistors in the circuit with the LEDs?

• The LEDs would blink faster.

• The LEDs might burn out because too much current would flow through them.

• The LEDs would be dimmer.

• Nothing would change, the LEDs would work fine.

Explain what happens when you run the following code snippet in the traffic light program:

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OFF

Which lines of the code are initializes the pins for the red, yellow, and green LEDs.

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Which part of the code lets the red light stay on for 10 seconds.

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OFF