Move along the S-shaped track
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In this example the module directive is defined to let mBot move in a S-shaped track.
Define the module directive to combine several blocks. The program executes the defined module directive, i. e. calling its defined block behavior. This can make the program simpler and easier to read. See Knowledge Point 2 for methods.
Point 1 Use “differential speed” to control mBot’s turning.
Use Block to directly control the direction of mBot in Example 15 Moving along the M-shaped track. Otherwise you can also control the speed of mBot’s left and right motors to control its direction:
When the right wheel speed is more than the left one, mBot turns left; when the left wheel speed is more than the right one, mBot turns right.
Install mBot correctly as required in the Instructions. Left wheel motor is connected to Motor Port 1 and right wheel motor to Motor Port 2. Watch mBot’s turning by testing the following script (taking mBot’s left turning for example, and its right turning is the same).
|Turning left while moving forward|
|Turning left on the left wheel|
|Turning left on the right wheel|
|Turning left in place. The effects is the same with Block|
Point 2 How to define the module directive
Click “Data and blocks” in “Scripts” and click “Make a block ” and enter the name of the new module directive in the window poping up, and then clck “Ok”. Then define the module directive in the programming area to use the new module directive for programming.
|Task 1||Let mBot moves in a round track|
|Task 2||Modify the speed value of left and right motors of mBot (such as increasing the difference between the two values) and watch the moving status of mBot and record it.|
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