Programs

Download the whole Mindstorms EV3 project created in the tutorial with the myBlocks included:

This package contains the three blocks used in the advanced calibration section of the FLL course.

The blocks contained are:

• InitiArray block
• CalibrateMinMax
• GetCalibrateValue 

Program for detecting the lines without using a wait block.

This program is developed with LEGO Education SPIKE App Python and is used to make the Luly, small LEGO Education SPIKE Prime competition robot with 3D building instructions align to a line with two color sensor. It's a mechanism we've used with EV3, NXT and now SPIKE.

from spike import PrimeHub, LightMatrix, Button, StatusLight, ForceSensor, MotionSensor, Speaker, ColorSensor, App, DistanceSensor, Motor, MotorPair
from spike.control import wait_for_seconds, wait_until, Timer
from math import *

hub = PrimeHub() 
color_sensor_E = ColorSensor('E')
color_sensor_F = ColorSensor('F')

motor_A =  Motor('A') # Set the motor port to the motor.
motor_B = Motor('B') # Set the motor port to the motor.

motor_A.set_default_speed(-30) # Set the default speed of the motor.
motor_B.set_default_speed(30) # Set the default speed of the motor.

motor_A.set_stop_action('brake') # Activate the brakes when the motor stops. The other conditions are 'hold' and 'coast'.
motor_B.set_stop_action('brake') # Activate the brakes when the motor stops.

motor_A_flag = 0 # Create a flag for motor A and set it to OFF.
motor_B_flag = 0 # Create a flag for motor B and set it to OFF.

def stop_at(colour):
    motor_A_flag = 0 # Reset the flag for motor A to OFF.
    motor_B_flag = 0 # Reset the flag for motor B to OFF.

    # Move forward.
    motor_A.start()
    motor_B.start()

    while (motor_A_flag == 0) or (motor_B_flag == 0): # Repeat while both sensors ever detect black color.
        if color_sensor_E.get_color() == colour: # If the color sensor on port E detect the desired color
            motor_A.stop() # stop the motor an port A and
            motor_A_flag = 1 # set the flag for motor A to ON.
        if color_sensor_F.get_color() == colour: # If the color sensor on port F detect the desired color
            motor_B.stop() # stop the motor an port B and
            motor_B_flag = 1 # set the flag for motor B to ON.

stop_at('black')
stop_at('white')
raise SystemExit # Close the program.

This program is developed with LEGO Education SPIKE App Word Blocks and is used to make the Luly, small LEGO Education SPIKE Prime competition robot with 3D building instructions align to a line with two color sensor. It's a mechanism we've used with EV3, NXT and now SPIKE.