MicroPython Tutorial III

Mark Lucking

Aug 1, 2019·2 min read

Ok, lets try and build a simple game with the code we learnt over the last two lessons in the next two. Here is our code template.

#!/usr/bin/env pybricks-micropython 
from pybricks import ev3brick as brick 
from pybricks.parameters import Button, Color 
from pybricks.tools import wait 
import time 
import randomcolorList = [Color.RED, Color.YELLOW, Color.ORANGE, Color.GREEN, Color.BLACK]def randomColor(): 
    seedling = int(round(time.time())) 
    random.seed(seedling) 
    colorNo = random.randint(0,4)
    return(colorNo)while True: 
    if Button.DOWN in brick.buttons(): 
        colorNo = randomColor() 
        brick.light(colorList[colorNo]) 
        wait(500) 
    if Button.UP in brick.buttons(): 
        colorNo = randomColor() 
        brick.light(colorList[colorNo]) 
        wait(500)

It is basically the same code you did in tutorial II, with a few minor changes that will come into play as we move forward.

We’re going to build a “simple Simon says” type game. We start by adding two subroutines. Code that you can place above the randomColor routine.

def blink(): 
    brick.light(Color.BLACK) 
    wait(500)def randomSet(): 
    global randomList 
    # RED = LEFT button 
    # YELLOW = RIGHT button 
    # ORANGE = DOWN button 
    # GREEN = UP button 
    # BLACK = starting mode 
    for loop in range(4):    
        randomList.append(randomColor()) 
        wait(1000)

In the first we define a method for turning the brick light off. In the second we document the colors against the buttons in comments (starting with a hash). We then use a simple loop to call our random number generator 4 times, waiting one second between each call for a new seed.

We then call our new subroutines in main program before the while True: loop.

randomSet() 
print(“randomList”,randomList) 
blink() 
for colorNo in randomList: 
    brick.light(colorList[colorNo]) 
    wait(1000)
blink()

Run the program, it will display the list as it generates it and then use that to show a sequence of colors.