Chapter 2 Tutorial

LEARNING OBJECTIVES

1. Learn how to control and apply the ultra sensor

ELECTRIC MODULES USED : THE ULTRASONIC SENSOR

The ultrasonic sensor is an input device for detecting distance.

It has two eyes:

emits ultrasonic waves
receives the signal bounded back after detecting an obstacle

Detection range: 3cm~400cm; Detection angle: 30 degrees

knowledge points

Building Block 1

Repeat encased script for specified times, and then continue to perform the following script.

Example

Building Block 2

Repeat until condition is satisfied. When the condition is not satisfies, the wrapped script will constantly run. If met, the program will move on to the following scripts.

Example

Building Block 3

The encased script keeps running and cannot be terminated.

Example

Building Block 4

Ultrasonic sensor block: to give feedback on the distance between the ultrasonic sensor and any obstacle in front of it.

Example

Programming Structure

TRY IT

Flow Chart

Start the program (when the green flag is clicked)
Constantly repeating and updating the ultrasonic sensor to make the position dynamically change.

Flow Chart

Start the program(when the green flag is clicked)

(repeat 2. 3. 4. five times)

2. Play mCore buzzer tone with C4

3. Wait 1 second

4. Stop playing sound

5. Green light is turned on one second

6. Repeatedly turn on blue light until pressing button on the mCore

7. Wait 3 seconds

8. Light is turned off

EXAMPLE EXPANSION

Catch the apple

When the mouse moves

forward and hits the apple,

mCore utters a sound.

Keep apples falling

Repeatedly execute its contained

script -> Display Apple -> Specify

the location that the apple

appears -> Repeatedly move the

apple down until it hit the edge

-> After it hits the edge, hide the

apple

Stop the program after the mouse collect 5 apples

Wait for the mouse to hit the

apple -> play a tone for 0.5

second -> stop the program after

5 apples are collected.

Use mCore together with the ultrasonic sensor to control the moving of the mouse

You must use values that are

through constantly repeating

and updating the ultrasonic

sensor to make the position of

the mouse dynamically change.

Exercise 1

Try to use loop structure to control RGB light on the baseboard. Let them flash once every second and indicate which building blocks are the loop body.

exercise 2

Try to make the buzzer sound as C4 in 10 times, E5 in 20 times, B6 in 30 times, and then keep repeating. Can you distinguish these loop bodies inside it?

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