Teacher's Notes - How the Python Clock Programming lesson go Pro Preview

Example solution to the task "Display "Hello World" text on the brick screen for 3 seconds. Experiment with the coordinates until the text appears approximately in the middle of the screen"

# Create your objects here.
ev3 = EV3Brick()

# Write your program here.
ev3.screen.draw_text(40, 50, "Hello World") 
wait(3000)

Example solution to the task "Create a numeric variable named "hours" equal to 2 and use the ev3.screen.draw_text() command to display it on the screen. You don't need to put variables in quotes."

# Create your objects here. 
ev3 = EV3Brick()

hours = 2

# Write your program here.
ev3.screen.draw_text(40, 50, hours)
wait(3000)

Example solution to the task "Program the "hours" variable to be a randomly selected number between 1 and 12. Test your program and tell us what number did you saw on the display."

import random

# Create your objects here. 
ev3 = EV3Brick()

hours = random.randint(1, 12)

# Write your program here.
ev3.screen.draw_text(40, 50, hours)
wait(3000)

Example solution to the task "Create another variable and name it "minutes" equal to a random number between 1 and 60. Show it on the screen after the "hours" variable. Test your program and tell us what number did you saw on the display."

import random

# Create your objects here. 
ev3 = EV3Brick()

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

# Write your program here. 
ev3.screen.draw_text(40, 50, hours)
ev3.screen.draw_text(40, 70, minutes)
wait(3000)

Example solution to the task "How many degrees does the short arrow of the clock have to rotate to show that an hour has passed? (360/12)" 

360 / 12 = 30

Example solution to the task "How many degrees does the long arrow of the clock have to rotate to show that one minute has passed? (360/60)"

360 / 60 = 6

Example solution to the task "Create a variable named "hour_degrees" equal to the randomly selected number of hours in the variable "hours" multiplied by (360/12)"

import random

# Create your objects here.
ev3 = EV3Brick()

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)

Example solution to the task "Create another variable named "minutes_degrees" equal to the randomly selected number of minutes in the variable "minutes" multiplied by (360/60)."

import random

# Create your objects here.
ev3 = EV3Brick()

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

Example solution of the task "Program the robot's short arrow to move a number of degrees equal to "hour_degrees" with a speed of 360."

import random

# Create your objects here.
ev3 = EV3Brick()

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

# Write your program here. 
Motor(Port.B).run_angle(360, hour_degrees, Stop.COAST)

Example solution to the task "Using a keyboard shortcut, copy the line with the run_angle () command and paste it underneath it. Change the copied line so that the long arrow (motor C) of the robot moves a number of degrees equal to "minute_degrees" with a speed of 360." 

import random

# Create your objects here.
ev3 = EV3Brick()

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

# Write your program here. 
Motor(Port.B).run_angle(360, hour_degrees, Stop.COAST, False)
Motor(Port.C).run_angle(360, minute_degrees, Stop.COAST)

Example solution to the task "Extract your motors in variables with the names "hours_motor" and "minutes_motor"."

import random

# Create your objects here.
ev3 = EV3Brick()

hours_motor = Motor(Port.B)
minutes_motor = Motor(Port.C)

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

# Write your program here. 
hours_motor.run_angle(360, hour_degrees, Stop.COAST, False)
minutes_motor.run_angle(360, minute_degrees, Stop.COAST)

Example solution to the task "Program the robot to wait 5 seconds after moving its arrows and then turn them back."

import random

# Create your objects here.
ev3 = EV3Brick()

hours_motor = Motor(Port.B)
minutes_motor = Motor(Port.C)

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

# Write your program here. 
hours_motor.run_angle(360, hour_degrees, Stop.COAST, False)
minutes_motor.run_angle(360, minute_degrees, Stop.COAST)

wait(5000)

hours_motor.run_angle(-360, hour_degrees, Stop.COAST, False)
minutes_motor.run_angle(-360, minute_degrees, Stop.COAST)

Example solution to the task "Program the hours and minutes not to appear on the screen before the clock hands are in their correct positions for 5 seconds."

import random

# Create your objects here.
ev3 = EV3Brick()

hours_motor = Motor(Port.B)
minutes_motor = Motor(Port.C)

hours = random.randint(1, 12)
minutes = random.randint(1, 60)

hour_degrees = hours * (360/12)
minute_degrees = minutes * (360/60)

# Write your program here.
hours_motor.run_angle(360, hour_degrees, Stop.COAST, False)
minutes_motor.run_angle(360, minute_degrees, Stop.COAST)

wait(5000)
ev3.screen.draw_text(40, 50, hours) 
ev3.screen.draw_text(40, 70, minutes)
wait(3000)

hours_motor.run_angle(-360, hour_degrees, Stop.COAST, False)
minutes_motor.run_angle(-360, minute_degrees, Stop.COAST)