3.2 Movement

This project is based on 3.1 Test the Car to make the car move in all directions.

Before we start programming, let’s review the working principle of L9110 module.

Here is the truth table of Motor B:

B-1A	B-1B(B-2A)	The state of Motor B
1	0	Rotate clockwise
0	1	Rotate counterclockwise
0	0	Brake
1	1	Stop

Here is the truth table of Motor A:

A-1A	A-1B	The state of Motor B
1	0	Rotate clockwise
0	1	Rotate counterclockwise
0	0	Brake
1	1	Stop

Programming

Now create blocks to make the car, forward, backward, left and right rotation and stop respectively.

1. Move Forward

The right motor turns clockwise and the left motor turns counterclockwise to move the car forward.

2. Move Backward

Backward is just the opposite, the right motor needs to turn counterclockwise, the left motor clockwise.

3. Turn Left

The left and right motors turn clockwise at the same time to make the car turn left.

4. Turn Right

Similarly, turn the left and right motors counterclockwise to turn the car to the right.

5. Stop

Stop the car by setting all motors to 0.

6. Make the car move

Make the car move forward, backward, left and right for 1 second, then stop. Since all blocks are placed in the [Forever] block, you will see that the car repeats the above actions.