Lesson 2: Drive to Number '1'

Now the VR Robot will drive back to the number ‘1.’
To navigate the VR Robot back to the number ‘1,’ remove the stop command and replace it with the following commands. Your project should look like this:

# Add project code in "main"
def main():
    drivetrain.turn_for(RIGHT, 90, DEGREES)

    while location.position(X, MM) < -100:
        drivetrain.drive(FORWARD)
        wait(5, MSEC)
    
    drivetrain.turn_for(RIGHT, 180, DEGREES)

    while location.position(X, MM) > -900:
        drivetrain.drive(FORWARD)
        wait(5, MSEC)

    drivetrain.stop()

Note that the second while loop contains a greater than operator instead of a less than operator. This is because the VR Robot is now driving down the X axis and the numbers are becoming smaller. The VR Robot will stop once the X-values are LESS than -900.
Launch the Number Grid Map Playground if it is not already open and run the project.
Watch the VR Robot drive to number ‘1’ on the Number Grid Map Playground.
In this project, the VR Robot drives to the number ‘1’ on the Number Grid Map Playground. Since the X-values are decreasing as the VR Robot drives to the number ‘1,’ the project uses a greater than operator.
The VR Robot will drive forward while the X-value is greater than the coordinate that the indicated number is on and stop once its X-value is less than the X-value of the coordinate. Since the X-value of the number ‘1’ is -900, the VR Robot will stop driving once the X-value is less than -900.

For Your Information

A wait command will pause the project's flow for a specific period of time in seconds before moving on to the next command. A wait command can be used to help observe individual behaviors in your project that may run quickly together, such as moving between two different locations on a Playground. A wait command can wait in seconds or milliseconds. Both of these commands will pause the VR Robot's movement for 1 second.

wait(1, SECONDS)
wait(1000, MSEC)

In the Number Grid Map Playground, the wait command could be used to cause the VR Robot to pause on a specific number before moving on to the next location in the project. In this example, the wait command will make the VR Robot stop for 2 seconds on the number '5', before driving back to the number '1'.

# Add project code in "main"
def main():
    drivetrain.turn_for(RIGHT, 90, DEGREES)

    while location.position(X, MM) < -100:
        drivetrain.drive(FORWARD)
        wait(5, MSEC)
    
    drivetrain.turn_for(RIGHT, 180, DEGREES)
    wait(1, SECONDS)

    while location.position(X, MM) > -900:
        drivetrain.drive(FORWARD)
        wait(5, MSEC)

    drivetrain.stop()

Select the Next button to continue with the rest of this Lesson.

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