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Teacher Toolbox icon Teacher Toolbox - Activity Outline

This exploration will introduce students to basic drive forward, reverse, and waiting programming behaviors. These basic skills will help them to succeed in the Automed Challenge at the end of this STEM Lab, when they will navigate a hospital floor by using the Speedbot.

Using the V5 Speedbot (Drivetrain 2-motor, No Gyro) template project enables the students to program the Speedbot to move forward by just using one instruction.

The Speedbot is ready to move!

This exploration will give you the tools to be able to program your Speedbot for simple movements. At the end of this activity, you will engage in the Basketball Drills Challenge using forward, reverse, and waiting behaviors.

Teacher Toolbox icon Teacher Toolbox

Here is an overview of the User Interface of VEXcode V5. Students will be introduced to these tabs/buttons during the activities in this Medbot STEM Lab. Links are also provided throughout the STEM Lab to provide more information about these tabs/buttons.

A screenshot showing the VEXcode V5 interface. The toolbar sits at the top of the screen, with the drag and drop menu below to the left and the C++ programming window below to the right. Below the programming window there is an 'Errors' window.

  • VEXcode V5 instructions that will be used in this exploration:
    • Drivetrain.driveFor(forward, 200, mm);
    • wait(1, seconds);

  • To find out more information about the instruction, select Help and then select the question mark icon next to a command to see more information.

    VEXcode Help menu for the Drive For command. The Help icon in the upper right corner is highlighted, illustrating what to select to open the Help Menu.

     

  • Make sure you have the hardware required, your engineering notebook, and VEXcode V5 downloaded and ready.

Teacher Tips icon Teacher Tips

If this is the student’s first time using VEXcode V5, they can reference the Tutorials at any time during this exploration. The Tutorials are located in the toolbar.

VEXcode V5 Toolbar with the Tutorials button called out in a red box, to the right of the File menu.

Materials Required:
Quantity Materials Needed
1

Speedbot Robot
1

Charged Robot Battery
1

VEXcode V5
1

USB Cable (if using a computer)
1

Engineering Notebook

Teacher Tips icon Teacher Tips

Model each of the troubleshooting steps for the students.

Step 1:  Preparing for the Exploration

Before you begin the activity, do you have each of these items ready? Check each of the following:

Step 2:  Start a New Project

Complete the following steps to begin the project:

  • Open the File menu and select Open Examples.

    VEXcode V5 Toolbar with the File menu open and Open Examples highlighted in a red box. Open Examples is the fourth menu item beneath New Blocks Project, New Text Project, and Open.

     

  • Select and open the Speedbot (Drivetrain 2-motor, No Gyro) template project. The template project contains the Speedbot's motor configuration. If the template is not used, your robot will not run the project correctly.

    The 'Example Projects' menu is open, with the 'Templates' category selected. The Speedbot (Drivetrain 2-motor, No Gyro) project is highlighted with a red box, indicating which project to select and open.

     

  • Since you will be working on moving the Speedbot forward and reverse, you will name your project Drive.  Click on the Project Name, Type in Drive and select Save.

 

The renaming dropdown menu is opened from the Project Name button on the V5 VEXcode toolbar. The project is being renamed to 'Drive'.

 

 

Teacher Tips icon Teacher Tips

  • Project Names can have spaces between or after the words.

    The V5 VEXcode toolbar with the Project Name button highlighted with a red box. The project name is set to 'Drive Forward'.

  • You can ask students to add their initials or the name of their group to the project name. This will help differentiate the projects if you ask the students to submit them.
  • Because this is the first activity with programming your students may attempt, you should model the steps, and then ask students to complete the same actions. The teacher should then monitor the students to ensure that they are following the steps correctly.
  • Make sure that the students have selected Open Examples from the File menu.
  • Make sure that the students have selected the Speedbot (Drivetrain 2-motor, No Gyro) template project.
  • You can point out to the students that there are several selections to pick from on the Examples page. As they build and use other robots, they will have a chance to use different templates.

  • Check to make sure the project name Drive is now in the window in the center of the toolbar.

    VEXcode V5 Toolbar displaying the project name 'Drive'.

Teacher Toolbox icon Teacher Toolbox - Saving Projects

  • Point out that when they first opened VEXcode V5, the window was labeled VEXcode Project. VEXcode Project is the default project name when VEXcode V5 is first opened. Once the project was renamed Drive and saved, the display was updated to show the new project name. Using this window in the toolbar, it is easy to check that the students are using the correct project.

  • Tell the students that they are now ready to begin their first project. Explain to the students that by just following a few simple steps, they will be able to create and run a project that will move the Speedbot forward.

  • Remind students to save their projects as they work. The C++ section from the VEX Library explains saving practices in VEXcode V5.

Teacher Toolbox icon Teacher Toolbox - Stop and Discuss

This is a good point to pause and have the students review the steps that were just completed on starting a new project in VEXcode V5 individually or in groups. Ask the students to reflect individually before sharing within their group or to the whole class.

Step 3:  Drive Forward

You are now ready to begin programming the robot to drive forward!

  • Before we begin programming, we need to understand what an instruction is. There are three parts to an instruction. For more information on what an instruction is, view the article, "Syntax Rules and Guidelines - VEXcode V5."

    Line of C++ code with each term labeled. The highlighted line of code reads Drivetrain.turnFor(90,degrees); with Drivetrain labeled as the Device, turnFor labeled as the Command, and (90,degrees) labeled as the Parameters.

  • Add the instruction to the project:

    Example C++ Project with the command Drivetrain.driveFor(100,mm); highlighted by a red box.

Teacher Tips icon Teacher Tips

You may notice an autocomplete function as you start to type the instruction. Use your “Up” and “Down” keys to select the name you want, then press “Tab” or (Enter/Return) on your keyboard to make the selection. For more information on this feature check out the C++ article.

A user is typing a C++ command, and after starting to type Drivetrain.d the program opens a dropdown menu suggesting autocomplete options.

  • Select the Slot icon to choose one of the eight available slots on the Robot Brain and select slot 1.

    VEXcode V5 Toolbar with the Slot menu opened to the left of the project name. The dropdown menu lists all of the available slots, from 1 to 8. The first slot is highlighted with a red box.

     

  • Connect the V5 Robot Brain to the computer using a micro USB cable and power on the V5 Robot Brain. The Brain icon in the toolbar turns green once a successful connection has been made.

    VEXcode V5 Toolbar with a red box around the green Brain icon, to the right of the Controller button.

     

  • Select Download to download the project to the Brain.

    VEXcode V5 Toolbar with a red box around the download icon, in between the Brain and Run buttons.

Teacher Toolbox icon Teacher Toolbox

  • Remind the students to disconnect the USB cable from the Robot Brain. Having the robot connected to a computer while running a project could cause the robot to pull on the connection cable.

Teacher Toolbox icon Teacher Toolbox - Stop and Discuss

Ask the students to predict what they think will happen when this project is downloaded and run on the Speedbot. Tell the students to record their predictions in their engineering notebooks. If time allows, ask each group to share their prediction

  • Check to make sure your project has downloaded (C++) by looking at the Robot Brain’s screen. The project name Drive should be listed in Slot 1.

    V5 Brain Home Screen shows the Drive program in slot 1 in the lower left corner directly beneath the Drive icon.

Teacher Toolbox icon Teacher Toolbox - Model First

  • Model running the project in front of the class before having all the students try at once. Gather the students in one area and leave enough room for the Speedbot to move if it is placed on the floor.

  • Tell the students it is now their turn to run their project. Make sure that they have a clear path and that no Speedbots will run into each other.

  • Run (C++) the project on the robot by making sure the project is selected and then press the Run button on the Robot Brain. Congratulations on creating your first project!

    V5 Brain screen with the Drive program open and a red box around the Run button on the far left side. To the right of Run are buttons for Timed Run, Match, and Wiring.

Step 4:  Drive Reverse

Now that you have programmed your robot to drive forward, let us program it to now drive in reverse.

  • Change the parameter in the drive instruction to display -100.

    Image showing the project name changed to

  • Select the Project Name to change it from Drive to Reverse.

    Project name dialog box in VEXcode V5 reads Reverse and shows that Slot 1 is selected.

     

  • Select the Slot icon to choose a new slot. Select slot 2.

    Slot selection in VEXcode V5 open with slot 2 selected and highlighted with a red box.

     

  • Download (C++) the project.

    Download button in the Toolbar of VEXcode V5 highlighted with a red box to the left of a green brain icon and to the right of the Run and Stop buttons.

  • Check to make sure your project has downloaded (C++) by looking at the Robot Brain’s screen. The project name Reverse should be listed in Slot 2.

    V5 Brain Home Screen shows the Reverse project in Slot 2, the second icon from the left in the bottom row, beside the Drive project in Slot 1.

  • Run (C++) the project on the robot by making sure the project is selected and then press the Run button on the Robot Brain.

    V5 Brain Screen with the Reverse project open and the Run button highlighted in a red box to the far left. To the right of Run are buttons for Timed Run, Match, and Wiring.

Teacher Toolbox icon Teacher Toolbox - Completing Step 4

  • To change the driveFor command from forward to reverse, simply change the first parameter to -100. This will have the motors in the drivetrain move in the opposite direction.

  • The number of mm can be changed, but for this example we will leave them at 100 mm as set in the previous step.

  • Remind them to disconnect the USB cable from the Robot Brain before running the project.

  • Remind students to save their projects as they work. The C++ section from the VEX Library explains saving practices in VEXcode V5.

Step 5:  Wait then Drive in Reverse

Now that we have programmed the robot to drive forward and then in reverse, we can now add a wait instruction so that the robot waits a certain amount of time before driving in reverse.

  • Add a wait instruction as shown. This tells the robot to wait three seconds before driving in reverse.

    Image showing the Python commands with a red box around the

  • Select the Project Name to change it from Reverse to WaitReverse.

    Project name dialog box in VEXcode V5 reads Wait Reverse and shows that slot 2 is selected.

     

  • Select the Slot icon to choose a new slot. Select slot 3.

    Slot selection in the VEXcode V5 Toolbar shows slot 3 selected and highlighted with a red box.

  • Download (C++) the project.

    Download button in the VEXcode V5 Toolbar is highlighted in a red box to the right of a green brain icon and to the left of the Run and Stop buttons.

  • Check to make sure your project has downloaded (C++) by looking at the Robot Brain’s screen. The project name WaitReverse should be listed in Slot 3.

    V5 Brain Home screen shows the Wait Reverse project in slot 3, the third icon in the bottom row.

  • Run (C++) the project on the robot by making sure the project is selected and then press the Run button.

    V5 Brain screen with the Wait Reverse project open and the Run button highlighted in a red box to the far left. To the right of Run are buttons for Timed Run, Match, and Wiring.

Teacher Toolbox icon Teacher Toolbox - Completing Step 5

  • Using a wait command will not end the project, it only pauses the robotic movement.

  • If the students are using a computer, remind them to disconnect the USB cable from Robot Brain before running the project.

  • Remind students to save their projects as they work. The C++ section from the VEX Library explains saving practices in VEXcode V5.

Step 6:  Complete the Basketball Drills Challenge!

Setup for Basketball Drills shows four lines spaced out with a start line on the left, and lines at 10cm, 20cm, and 40cm away. A V5 Robot sits ready to begin with its front wheels on the start line.

Basketball Drills Challenge layout

In the Basketball Drills Challenge, the robot must be able to navigate a series of lines at different distances. The robot will travel forward to the first line which is 10 cm from the starting position, wait 1 second, and then travel backwards returning to that same line. The robot will then repeat the action by driving forward 20 cm to the second line, wait 1 second, and then drive backward to the original starting line. The robot will drive forward to the third line with a distance of 40 cm, wait 1 second, and then finally return to the starting line to finish the challenge.

Before programming the robot, plan out the robot's path and behaviors in your engineering notebook.

After completing the Basketball Challenge, you will be able to combine forward and reverse movements with additional robot behaviors to complete even more advanced challenges.
Keep in mind when programming that 1 cm = 10 mm.

Teacher Toolbox icon Teacher Toolbox - Solution

View a sample solution below:

Teacher Toolbox icon Teacher Toolbox - Stop and Discuss

Ask the students to share their solutions in pairs before discussing them as a whole class. Facilitate the discussion by asking:

  • Did you face any difficulties while programming this challenge?

  • Did your robot behave like you expected based on your project? Why or why not?

  • If you could do the challenge over, is there anything that you would have done differently?

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