2. Lesson 2 - Third Wheels and Square

Introduction

intro to lesson 2 of A2

Young Earl Bot - Simplified LEGO Mindstorms Robot

The goal of these building instructions is to build a simple LEGO Mindstorms EV3 robot without wheels. You should then think of yourself how exactly to add the wheel. Which wheels would you use on the front? How are you going to build the third wheel? Here are for example a few recommendations on building the third wheel - 1, 2, 3, 4 

Later on you can expland this construction with a grabber as demosntrated here

90 degrees turn with LEGO Mindstorms robot

90 degrees turn for the robot is different from 90 degrees turn for a motor!

90 degrees for the motor

Ninety degrees is a quarter of rotation of the tire. During a pivot turn, only that motor is turning. A quarter of rotation is very short distance and the result is that the robot moves only a little.

90 degrees for the robot

The expected result of a 90 degrees turn for a robot is that the robot is turned in the space 90 degrees to the side. That turn is very different from 90 degrees for a motor.

Test different caster wheels and comment on the difference

You already have your square with the robot.

Now, let's compare different castor wheel constructions. Build them all or borrow them from other students in the classroom. Make a rotation so that everyone can use every caster wheel construction and note the results in the challenge below.

As a reward after the challenges

Depending on how well you solved the challenges your teacher can choose one from two extra challenges:

Change the wheels of your robot and test. Adjust the program if needed.

or

Add a grabber to your robot. Program the meduim motor to close and open the grabber. Grab an object.

Earl Bot - Grabbing and Clearing LEGO Mindstorms Robot without wheels

The goal of these building instructions is to build a LEGO Mindstorms EV3 robot without wheels. You should then think of yourself how exactly to add the wheel. Which wheels would you use on the front? How are you going to build the third wheel? Here are for example a few recommendations on building the third wheel - 1,2,3,4 

Task normal icon Tasks to finish a class

  1. Take pictures and make videos of your robots
  2. Disassemble and arrange the robot
  3. Arrange your workplace
    • It is important to arrange the electronics of the robots on the cover of the box.
    • Wind the programming cable so that it is assembled.
    • Put the robot cables next to the electronics.
    • Wind the mouse cable around the mouse.
    • Wrap the cable of the laptop charger in a way that your teacher will show you.
    • When you turn off the computer, leave it next to the robot box.
  4. Turn off all programs on your computer
  5. Exit FLLCasts  
  6. Shut down your computer
  7. Put your chair under the desk.