04 Traffic Lights (PICO)

What is a traffic light controller?

• A system that controls the speed of vehicles

• A system that plays music at traffic lights

• A system that monitors pedestrian movements

• A system that changes the lights on a timer

What is the purpose of a current-limiting resistor when connecting an LED to a Pico?

• To change the color of the LED

• To increase the brightness of the LED

• To make the LED blink at a faster rate

• To prevent the LED from burning out

What is the purpose of the button in the code?

• To activate the green LED

• To signal the pedestrian's intention to cross

• To turn on the buzzer

• To change the traffic light sequence

What does the buzzer do in the code?

• It indicates a malfunction in the system

• It signals the end of the traffic light sequence

• It plays music

• It alerts pedestrians about the traffic light change

What is the purpose of the while loop in the code?

• To check the value of the button

• To control the traffic light sequence

• To activate the buzzer

• To initialize the LED pins

What is the purpose of the global button_pressed variable in the code?

• To activate the pedestrian LED

• To store the value of the button

• To control the duration of the traffic light sequence

• To indicate if the button has been pressed

What is the purpose of the utime.sleep() function in the code?

• To reset the button value

• To activate the buzzer

• To pause the program for a specified duration

• To turn off the LED

What does a flashing amber light on a UK traffic light mean?

• Stop and wait for the light to turn green

• Proceed with caution

• Stop and give way to oncoming traffic

• No action is required

Which of the following is the correct order of sequence for the UK Pelecan crossing?

• Red, Green, Amber

• Green, Amber, Red

• Amber, Green, Red

• Green, Red, Amber

Which GPIO Pin number is used to light the onboard LED?

• 25

• 15

• 4

• 23