The brief

In assigned groups, you will program your robot to "dance" to music of your choice. Naturally a dance competition will have a restricted dance floor area.

Your robot is not as swift on their wheels as you are on your feet, so the choice of music is important.

And no doubt its not as debonair as you either.

Specifications:

• • dance moves must be within the 1.5m squared dance floor

  • dance routines must be between 15 and 20 seconds

  • music selection is up to you (no offensive lyrics)

  • music may be played through the robots speaker or on another device

  • you may decorate your robot

  • you may modify your robot

task 01: 01_forward

go forward

• move forward at speed 20 on for 1 rotation.

task 02: 02_steer

steer left & then right

• steer left 30º at speed 20 on for 360 degrees,

• steer right 30º at speed 20 on for 360 degrees.

task 03: 03_lights

use the P-bricks display lights

• light on red no flashing, steer to the left 30º at speed 20 on for 1 sec, wait 2, light off,

• light on green flashing, steer to the right 30º at speed 20 on for 1 sec, light off.

When you write more complex code, setting the P-brick lights can be help you determine what part of your program is active.

task 05: 05_loop

Understanding how CPU speed effects your code

• light on red no flashing,

• loop 1 times:

[motor ON at speed 20],

• motor OFF & brake, light off, wait 2,

• light on green no flashing,

• loop 9 times:

[motor ON at speed 20],

• motor OFF & brake, light off, wait 2,

• light on yellow no flashing,

• loop 900 times:

[motor ON at speed 20],

• motor OFF & brake, light off.

How far did the robot travel for each loop? Any idea why?

Answer: CPUs (even a low spec LEGO CPU) work extremely fast, so by the time the CPU has actioned the turn motor ON command, then exited the loop and turned the motor OFF, the motor has not even begun to turn. Loop 9 times and not much happens; you need to loop many times before the motor has a chance to turn before the CPU turns it OFF.

task 6: 06_sound

sound from the internet

download an mp3 sound file from internet,

use the Tools/Sound editor to break the sound file into a max of 7 sec chunks,

save to your project.

• loop until touch sensor bumped:

[play sound until end of file].

task 07: 07_if

using a switch / if block

• light on yellow no flashing,

• loop forever:

[if ultrasonic sensor dist < 20, light on green no flashing, else light on red no flashing].

task 08: 08_compare

within a range?

• light on yellow no flashing,

• loop forever:

[ultrasonic sensor passes dist to compare block, if within range (15 to 20), light on green no flashing, else light on red no flashing].

task 09: 09_display

display information on the P-block

• loop forever:

[ultrasonic sensor passes dist to, display via wire].

extension 01: 01_variables

variables & constants

• ight on yellow no flashing,

• create minRange variable with number 15, create maxRange variable with number 20,

• loop forever:

[read variables minRange & maxRange and ultrasonic sensor passing values to compare block, if within range, light on green no flashing, else light on red no flashing].

extension 02: 02_gyro

using gyro to turn

• {calibrate & reset gyro to zero},

• loop until gyro >= 90º

[L/H motor ON, at speed 20],

• motor OFF & brake,

• reset gyro to 0º,

• loop until gyro <= -90º:

[R/H motor ON, at speed 20],

• motor OFF & brake.

This will require the Gyro to be correctly calibrated, which can only be done successfully if the Gyro is completely still during this process.

One way is to plug it into the Brick, but this results in the Gyro being disturbed and so may fail to calibrate correctly.

The other is via issuing commands; use the Teacher supplied My Block code {reCalGyro.ev3p} to calibrate the Gyro at the start of your program.