6.4 A car testing facility has speeding cars run into a concrete wall at high speeds. Simulate a scenario where a buzzer starts to beep when the car is less than 50 m from the wall and a LED lights up when the car is less than 10 m from the wall.

from machine import Pin, time_pulse_us
import time

trig = Pin(26, Pin.OUT)
echo = Pin(22, Pin.IN)
buzzer = Pin(17, Pin.OUT)
led = Pin(0, Pin.OUT)
SPEED=0.0343
def get_distance():
    # Send trigger pulse
    trig.low()
    time.sleep_us(2)
    trig.high()
    time.sleep_us(10)
    trig.low()

    # Measure echo pulse
    duration = time_pulse_us(echo, 1)

    # Convert to distance (meters)
    distance = ((duration *SPEED) / 2 )/100
    real_dist=(400*distance)
    return real_dist

while True:
        distance = get_distance()
        print("Distance: {:.2f} m".format(distance))

        # Case 1: less than 50 m → buzzer beeping
        if distance < 50 and distance >= 10:
            buzzer.on()
            time.sleep(0.2)
            buzzer.off()
            time.sleep(0.2)

        # Case 2: less than 10 m → LED ON + continuous buzzer
        elif distance < 10:
            led.on()
            buzzer.on()

        else:
            led.off()
            buzzer.off()

        time.sleep(0.1)