Each group needs:

• LEGO MINDSTORMS EV3 robot, such as EV3 Core Set (5003400) at https://education.lego.com/en-us/products/lego-mindstorms-education-ev3-core-set/5003400#lego-mindstorms-education-ev3 (Note: If not enough robots are available for one per group, share the robots you have among several groups, or use one robot for the class, sharing data with everyone.)
• 2 "objects" found in the classroom, for the robot to sense at the 100 and 200 cm locations (perhaps bottles or boxes)
• stopwatch
• Pre-Activity Echolocation Worksheet, one per student
• Echolocation Activity Datasheet, one per student
• Post-Activity Echolocation Worksheet , one per student
• echolocation_program_10.ev3
• echolocation_program_25.ev3
• echolocation_program_50.ev3
• echolocation_program_75.ev3
• echolocation_program_90.ev3

Note: This activity can also be conducted with the older (and no longer sold) LEGO MINDSTORMS NXT set instead of EV3; see below for those supplies:

• LEGO MINDSTORMS NXT robot, such as NXT Base Set
• echolocation_program_10.rbt
• echolocation_program_25.rbt
• echolocation_program_50.rbt
• echolocation_program_75.rbt
• echolocation_program_90.rbt

To share with the entire class:

• ruler, marked in cm and inches
• masking tape, to mark off the robot course