Exercise $1$

Implement the ultrasonic sensor to read the distance between it and an object of your choosing. Pressing the left button changes the display between centimeters and inches.

Task $1$: Sonar $-$ Task Period: $1000$ms

Use the ultrasonic sensor to measure the distance.Place an object of your choice in front of the sensor to measure its distance

Task $2$: Display $-$ Task Period: $1$ms

Output the distance obtained from the ultrasonic sensor onto the $4$D$7$S displayThe display should initially show the distance in centimeters.

Task $3$: Left Button $-$ Task Period: $200$ms

When the left button is pressed, toggle the $4$D$7$S display to show the distance between centimeters and inches

Hint: Declare a variable that holds the distance as a global variable so that different tasks can read its value.

Hint $2$: If you encounter "ghosting" effect on your $4$D$7$S$,$ try swapping the order of setting the digit display and calling outNum$().$ For example, if you set the digit to be displayed first then call outNum$(),$ change it so that you call outNum$()$ first. And vice versa