YOU LEARN HERE...

how a robot can repeat certain command sequences and how you can structure your programs better with named program blocks (functions).

EXAMPLES

Example 1: Drivesquare To move a square, the robot must move forward a distance four times and turn 90°. Use a repeat loop for the repetitive movement. This is introduced with repeat followed by the number of repetitions and a colon. The commands that are to be repeated must be indented.

from mbrobot import *
#from mbrobot_plus import *
            
repeat 4: 
    forward()
    delay(2000)
    left()
    delay(550)
stop()

First run the program in simulation mode. In real mode, you may have to adjust the time when turning left.

In contrast to the simulation, in which the robot can drive exactly through a square, it is difficult for the real robot to drive exactly straight ahead and turn exactly at a right angle. This corresponds to reality, because no car will ever drive exactly straight ahead if the wheel position is fixed, i.e. the steering is locked. This is why robots are equipped with sensors that help them to correct these inaccuracies. So don't spend too much time teaching the robot to drive exactly square.

Example 2: Endless loop In many situations, a robot carries out certain activities “endlessly”, or until it is switched off or the program is aborted. For example, if it has to constantly report back sensor data. A repeat-Schleife repeat loop without a number of repetitions is used for this. In your example, the robot visits four locations endlessly, which are on paths that are at right angles to each other, and returns to the starting point each time.

from mbrobot import *
#from mbrobot_plus import *
            
repeat: 
    forward()
    delay(2000)
    backward()
    delay(2000)
    left()
    delay(550)

Here it is useful to know how to cancel a running program: The easiest way is with switsch

Example 3: Structure programs with your own functions
With named program blocks, called functions in Python, you can structure your programs better. It is an important programming technique because more complex programs can be broken down into smaller, easily programmable sub-programs with the help of functions. Functions are also used to advantage when a program block is used several times.

A function definition always begins with the keyword def, followed by a function name, a parameter bracket and a colon. The statements in the function body are indented. The function is called in the main program.

In your example, you define a blink() function that causes the red LED to light up once. In the main program, the robot makes a similar movement to the previous example. Before it moves backwards, it stops, flashes twice and moves backwards to the starting point.

from mbrobot import * #from mbrobot_plus import * def blink(): setLED(1) delay(500) setLED(0) delay(500) repeat 4: forward() delay(2000) stop() blink() blink() backward() delay(2000) left() delay(550) stop() from mbrobot import * #from mbrobot_plus import * def blink(): setLED(1) delay(500) setLED(0) delay(500) repeat 4: forward() delay(2000) stop() blink() blink() backward() delay(2000) left() delay(550) stop() ►Copy to clipboard

REMEMBER...

To repeat a program block n times, use a repeat loop:
 repeat n:
     Instructions

To repeat a program block endlessly, use an endless loop:
 repeat:
     Instructions
The indented lines are repeated until the program is terminated by closing the terminal window.

You can use functions to structure your programs better and avoid code duplication. You must differentiate between the function definition and the function call.

TO SOLVE YOURSELF