Secure the Power Supply

1. Prepare

• Read through the student material in the EV3 Classroom App.
• Collect some information about solar power and how it’s used in space.
• If you feel it’s needed, plan a few lessons to go through the Robot Trainer unit in the app. This will help familiarize your students with LEGO^® MINDSTORMS^® Education EV3.
• To complete this lesson, your students will have to have built the eight Space Challenge models and set up the Challenge Mat.
• If you don’t have double-block class time, plan to run this lesson over multiple sessions.

Part A

2. Engage (10 Min.)

• Use the ideas in the Ignite a Discussion section below to engage your students in a discussion related to this mission.
• Explain the objective, rules, and achievement badges for this mission.
• Split your class into teams.

3. Explore (25 Min.)

• Have your students brainstorm ideas for solving this mission.
• Encourage them to create multiple prototypes, exploring both building and programming.
• Allow the teams some time to work independently on building and testing their solutions.

4. Explain (10 Min.)

• Facilitate a discussion about the key functionalities the robot must have in order to navigate to the Solar Panel and rotate the handle.

Part B

5. Elaborate (45 Min.)

• Have each team practice lining up their robot and sending it on the mission to unfold the Solar Panel.
• Let them continue working on their robots until they’re ready for a judged attempt.
• Don’t forget to leave some time for cleanup.

6. Evaluate

• Award achievement badges based on how well each team solved the mission.
• Evaluate the creativity of each team’s solution and how well their team worked together.
• You can use the assessment rubrics provided to simplify the process.

Solar arrays consist of multiple solar panels and are useful as a power supply for space exploration. The amount of sunlight on a planet decreases as the distance to the Sun increases. This means that Mars receives less than half the amount of sunlight that we have on Earth. However, with a big enough solar array, plenty of power can be generated!

Use these questions to engage your students in a discussion about the advantages and disadvantages of solar power in space:

• What’s a solar array?
• What are the strengths and weaknesses of using solar arrays as a power supply for the Mars Outpost?

Mission Goal
The robot navigates to the Solar Panel and rotates the handle until it’s fully unfolded and stays in an upright position.

Here’s an example mission solution that completes this mission:

Mission Rules
There are five rules that apply to all of the Space Challenge missions. Make sure your students know all of them before they start:

• Your robot must always start the mission from the base area.
• Your robot must leave the base area before carrying out the mission.
• A “successful robot return” occurs when any part of the robot crosses over any part of the base area line.
• You’re not allowed to touch your robot while it’s outside of the base area.
• If you touch your robot while it’s completely outside of the base area and it’s holding an object, the object must be returned to its original position and you must begin the mission again.

Mission Achievement Badges
There are four levels of achievement badges. Explain that each team will be awarded an achievement badge based on how well they accomplish the mission. Refer to the Assessment Opportunities section below for a description of the achievement badges for this mission.

Open-Ended Solutions
This project is designed so that every team can have a unique solution. Use these questions to help teams brainstorm ideas for solving this mission:

• What are some ways the robot could navigate to the Solar Panel?
• Which type of motorized mechanism can be used to rotate the handle?

Example Mission Solution
The example mission solution is comprised of the following solution extensions:

• Space Driving Base
• Solar Module
• Color Sensor Down

Execute the Mission
Reset the Solar Panel, place the example solution model in starting position “1” on the Challenge Mat, and execute the mission.

Mission Troubleshooting
Use the Color Sensor in Color Mode to detect the green line on the Challenge Mat. Use the Color Sensor in Reflected Light Intensity Mode to line up the robot using the gradient. For consistent results, start by calibrating the Color Sensor using the black and white lines that are just outside the base area.

Solution Program

Important
This program is unique to the example solution model described above. Due to variations in friction, battery level, lighting conditions, and the condition of the LEGO^® components, it’s likely that you’ll have to make adjustments to the program. Before doing this, however, try making small adjustments to the robot’s starting position in the base area.

Simplify this lesson by:

• Working side-by-side with your students to help them figure out how to rotate the Solar Panel handle
• Having your students complete the Colors and Lines lesson in the Robot Trainer unit before attempting this mission
• Encouraging peer-to-peer learning and coaching

Take this lesson to the next level by:

• Limiting the amount of time the students have to solve the mission
• Challenging the students to use a Color Sensor to solve this mission
• Adding design constraints by limiting the number of LEGO^® elements available or assigning a “price” to each type of LEGO element and a maximum “cost” per robot

Teacher Observation Checklist
Create a scale that matches your needs, for example:

1. Partially accomplished
2. Fully accomplished
3. Overachieved

Use the following success criteria to evaluate your students’ progress:

• Students designed a robot that meets the requirements of the mission.
• Students came up with creative solutions and considered multiple solutions.
• Students worked together as a team to complete the mission.

Achievement Badges
Award an achievement badge based on how well the team solved the challenge mission.

• Bronze: The team hasn’t managed to successfully unfold the Solar Panel.
• Silver: The team has managed to unfold the Solar Panel but it doesn’t stay upright.
• Gold: The team has unfolded the Solar Panel and it stays in an upright position.
• Platinum: The team has unfolded the Solar Panel and it stays in an upright position. They also went beyond the mission requirements by adding features to their design.

Self-Assessment
Have each student choose the achievement badge that they feel best represents their performance.

• Bronze: We did the best we could under difficult circumstances.
• Silver: We had a few accidents along the way but we still battled on to the end of the mission.
• Gold: We’ve accomplished the mission with excellent results.
• Platinum: We’ve not only completed the mission but also added original and effective features to our design.

To integrate language arts skills development, have your students:

• Create a presentation or a video highlighting their robot’s features and performance
• Create a presentation explaining some important features of their program

Note: This will make for a longer lesson.

Students who enjoyed this lesson might be interested in exploring these career pathways:

• Information Technology (Computer Programming)
• Manufacturing and Engineering (Pre-Engineering)
• Science, Technology, Engineering & Mathematics (Engineering and Technology)