Arduino for Beginners - 2022 Complete Course - Activity 15- Solution

The video tutorial guides viewers through setting up an ultrasonic sensor to detect object proximity and control LEDs based on distance. It covers initial code setup, pin definitions, and creating a function to manage LED states. The tutorial explains conditional logic for LED activation and integrates the function into the main loop. Finally, it demonstrates testing the setup and addresses common troubleshooting tips for sensor connectivity.

What is the primary purpose of using an ultrasonic sensor in this setup?

• To measure temperature

• To detect the distance of objects

• To control the speed of the robot

• To provide power to the LEDs

Which pin is defined for the first LED in the setup?

• Pin 8

• Pin 10

• Pin 12

• Pin 15

What is the function 'powerLEDsFromDistance' used for?

• To reset the sensor readings

• To control the LEDs based on distance

• To calculate the speed of the robot

• To save the program state

What happens when the distance is greater than 100 cm?

• The green LED is powered on

• All LEDs are turned off

• The red LED is powered on

• The yellow LED is powered on

Why is it unnecessary to check if the distance is less than 100 in the 'else if' condition?

• Because the sensor cannot measure beyond 100 cm

• Because the previous condition already ensures it

• Because the code will not compile otherwise

• Because the LEDs are not affected by this range

What should be checked if the yellow LED blinks unexpectedly?

• The code syntax

• The LED's brightness setting

• The sensor's connection on the breadboard

• The power supply

What visual indication is given when an obstacle is too close to the sensor?

• All LEDs flash simultaneously

• The red LED is powered on

• The yellow LED turns off

• The green LED blinks