1. Robotics Switch block variant. Record/Play. Timer.
Present building project proposals
Homework: Postings. Plan projects.

2. Switch block IF/ELSE Case statement Number Text
Can set the default condition

3. Switch block Note: tabs. Current one is third Value of Type Number
* Button marks default
Tabbed,
Not flat view

4. Applications
Decide among 3 or more conditions rather than using nested logical tests ?

5. Timer 3 timers are available Must be reset. Output can be
Logical result of comparison
The unit for the trigger is seconds!
Elapsed time since reset
The unit for reading is milliseconds

6. Convert to text & combine to say Time is
Read out the time
Reset timer 2
Display & then wait

7. Original blocks vs minis
Timer example: one motor move and one display

8. Record/Play Can record motion of the motors
Stores information on the NXT for playback

9. Note
This is teach/playback: useful when action is NOT governed by sensors
Not easy to move robot motors ‘by hand’
Motors difficult to synchronize so playback is jiggly..
May be more useful for jointed motion?
See on-line discussion

10. Building projects
Presentations

11. Homework [continue to] plan building projects Postings News articles
Comments on library presentations
Comments on building projects