1 / 9

Lab 3

Lab 3. Basic Robot Brain. Programs consist of import lines, function definitions and and a starting point. Line 1: from myro import * Line 2: initialize("comX") Line 3: <any other imports> Line 4: <function definitions> Line 5: def main(): Line 6: <do something>

barth
Download Presentation

Lab 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lab 3 Intro to Robots

  2. Basic Robot Brain • Programs consist of import lines, function definitions and and a starting point. Line 1: from myro import * Line 2: initialize("comX") Line 3: <any other imports> Line 4: <function definitions> Line 5: def main(): Line 6: <do something> Line 7: <do something> Line 8: ... Line 9: main() Always start from a function called main() Intro to Robots

  3. Exercise • Combine the following functions into a program that yoyos and wiggles for a bit. Try to make your dance short and sweet. def yoyo(speed, waitTime): forward(speed, waitTime) backward(speed, waitTime) stop() def wiggle(speed, waitTime): motors(-speed, speed) wait(waitTime) motors(speed, -speed) wait(waitTime) stop() Intro to Robots

  4. Exercise: • Take the previous program and rename the main() function dance(). • Now create a main() function that calls dance(). • The problem is if you want to “dance all night”. • Call the program dance.py. • It works but not very interesting: def main(): dance() dance() dance() dance() . . . Intro to Robots

  5. Repetition in Python (and other languages): • Programming languages have syntax for repeating the same thing over and over and over and over . . . • for-loop: when you know exactly how many times to repeat something • while-loop: when you don’t know, in advance, exactly how many times you need to repeat something def main(): for i in range(1): dance() keeps calling dance()until 10 seconds havepassed def main(): while timeRemaining(10): dance() Intro to Robots

  6. Exercise: • Modify the dance.py program to use a for-loop. Intro to Robots

  7. While-Loops: • c(i) is a boolean condition that is True of False depending on the value of i. • f() gives a new value to i, once for each iteration through the loop. • This loop will go on forever if f() never returns a value for which c(i) == False. i = 0 while c(i): # do something i = f() answer = ‘No’while answer == ‘No’: dance() answer = ask(‘Again?’) what happens if you never enter ‘No’but rather ‘no’, ‘n’, NO’, etc. Intro to Robots

  8. Infinite Loops: • The example on the last slide shows that a loop can, by accident, go on forever. You can also intentionally write an infinite loop. • How do you stop this loop? while True: # do something Ctrl-C Intro to Robots

  9. Exercise: • Modify the dance.py program to replace the for-loop with a while-loop. • Try various while-loops including an infinite loop. Intro to Robots

More Related