The Complete Beginners Guide to Arduino - 2021 - Interactive Traffic Lights

This tutorial explains how to make a traffic light simulation interactive by adding a button. It covers wiring the button to an Arduino Nano, modifying the code to include a button press detection, and using a while loop to control the traffic light sequence. The tutorial ensures that the traffic light system allows vehicles to move and pedestrians to cross safely, with a delay to prevent constant button pressing.

What happens to the traffic lights when the button is pressed?

• The vehicle light turns yellow and the pedestrian light turns blue.

• Both lights turn off.

• The vehicle light stays green and the pedestrian light stays red.

• The vehicle light turns red and the pedestrian light turns green.

How long do pedestrians have to cross the road after the light changes?

• 5 seconds

• 10 seconds

• 15 seconds

• 20 seconds

What is the purpose of using a momentary push button in the circuit?

• To keep the lights permanently on.

• To make the traffic light sequence interactive.

• To change the color of the lights.

• To disconnect the circuit.

Why is it unnecessary to use an external resistor with the button?

• Because the button is already connected to a power source.

• Because the button is not part of the circuit.

• Because the Arduino Nano has built-in pull-up resistors.

• Because resistors are not needed in this circuit.

What pin mode is set for the button in the code?

• ANALOG

• OUTPUT

• INPUT

• INPUT_PULLUP

What does a high signal on the button pin indicate?

• The button is pressed.

• The button is not pressed.

• The light is off.

• The circuit is broken.

What is the role of the while loop in the main code?

• To continuously change the light sequence.

• To wait for the button to be pressed.

• To turn off the lights.

• To reset the circuit.

What happens when the button is pressed during the 10-second delay?

• The sequence changes immediately.

• Nothing happens until the delay is over.

• The lights turn off.

• The sequence resets.

What is the main function of the button in the traffic light system?

• To increase the brightness of the lights.

• To turn off the system.

• To initiate the light sequence change.

• To change the light colors randomly.

How does the system ensure vehicles have enough time to pass?

• By turning off the pedestrian lights.

• By ignoring the button press for the first 10 seconds.

• By keeping the lights on green permanently.

• By using a timer to reset the sequence.