What the Teacher Will Do:

• Instruct students that they will continue to work in their groups to follow the steps on this page.
• Circle the classroom as students work through the steps on this page and answer any questions that arise.
• Students will let you know when they are ready for their check in. Guidance for this check in is provided in a Teacher Toolbox at the bottom of this page.
• Once all groups have finished testing their projects and have picked up and dropped off a red disk using the UI on the Brain's screen, bring the groups together for a whole-class discussion. Guidance for this discussion is provided in a Teacher Toolbox at the bottom of this page.

If groups are finding that the arm does not pick up and drop off the red disk when they run their project, try the following troubleshooting techniques.

1. Check the location of the blocks in the project. Ask students to verify that the [Joint move] and [Energize electromagnet] blocks are beneath the 'Red Box Pressed' comment.
   
2. Check the mastering values.
   1. Instruct students to check that the mastering values they recorded in their engineering notebook during Seek match what is in the [Set mastering] block.
   2. If the problem still persists, have students follow the steps in Seek to rerecord their mastering values.
3. Check the VEXcode V5 project.
   1. Make sure students are re-downloading their project each time they make a change and before they run the project
4. Check the build. 
   1. There may be a mechanical issue with your Workcell. Instruct students to look at the Lab 7 build instructions first and verify that the additions to their Workcell match.
   2. Have students go back to the Lab 1 build instructions for a complete look at the build and check that all elements match. Even one small detail being wrong can affect the movement of the arm on the Workcell.

  Review the following with the group during their check in: 

• Ensure groups added the additional blocks to the correct places in the project. View this example code as reference. Note that the coordinates will vary depending on the group.
  
• Ensure that groups set the [Energize electromagnet] block beneath the 'Red Box Pressed' comment to 'drop.'

After groups have coded the arm to pick up and drop off a red disk, engage the class in a discussion about their experience coding and their observations.

• Begin by asking groups to share with the rest of the class the x, y, and z-coordinates they used for Points 1, 2, and 3 to code the arm. If time allows, ask groups to run one or both of their projects to show the arm picking up and dropping off the red disk.
• Then ask groups to share any observations they had while creating and testing the two projects. Ask students questions such as: 
  • How does the 'Lab 7- Manual Move' project compare to the 'Lab 7- Sort Disk' project? Students should explain that the two projects used a lot of the same blocks like the [Energize electromagnet] and [Joint move] blocks. The two projects also used the same values. The main difference was that the 'Sort Disk' project had the UI on the Brain's screen that allowed the groups to choose when and where the arm should move to each location.
  • What benefits are there to using a UI-based project versus a project where each movement of the arm is coded (like the 'Manual Move' project)? Students may have different answers, but some should relate to how the UI-based project can be repeated or used no matter what color disk or no matter how many disks are present.
  • How was the [Comment] block used in this project? [Comment] blocks are used to communicate different sections and blocks of the 'Lab 7- Sort Disk' project.