当我的机器人驶过一个黑带，大声说出4号之后，我该如何阻止它呢？

Question

%%sim_magic_preloaded --background Coloured_bands -R
# Program to count the bands aloud

# Start the robot moving
tank_drive.on(SpeedPercent(15), SpeedPercent(15))

# Initial count value
count = 0

# Initial sensor reading
previous_value = colorLeft.reflected_light_intensity_pc

# Create a loop
while True:

    # Check current sensor reading
    current_value = colorLeft.reflected_light_intensity_pc

    # Test when the robot has entered a band
    if previous_value==100 and current_value < 100:
        # When on a new band:
        # - increase the count
        count = count + 1
        # - display the count in the output window
        print(count)
        # - say the count aloud
        say(str(count))

    # Update previous sensor reading
    previous_value = current_value

需要一些帮助在这个编码，我试图让机器人停下来后，它超过了黑带，这是第四波段，而且它也没有说出响亮的数字4，一旦它超过了黑带

Answer 1

import time

previous_value = colorLeft.color

tank_drive.on(SpeedPercent(15), SpeedPercent(15))

count = 1

while True:
    current_value = colorLeft.color
    print(current_value)

    if previous_value==6 and current_value != 6:
        print(count)
        say(str(count))

        count += 1

    #Now it should stop at band 4
    if count > 4 and current_value==6:
        time.sleep(1)
        tank_drive.off()
        break

    previous_value = current_value