from machine import Pin, time_pulse_us
import utime

# Define the pins for the ultrasonic sensor
trigger_pin = Pin(2, Pin.OUT)  # GPIO pin for trigger
echo_pin = Pin(3, Pin.IN)      # GPIO pin for echo

def measure_distance():
    # Send a 10us pulse to the trigger pin to start the measurement
    trigger_pin.value(1)
    utime.sleep_us(10)
    trigger_pin.value(0)

    # Measure the duration of the pulse on the echo pin
    pulse_duration = time_pulse_us(echo_pin, 1, 30000)

    # Speed of sound is approximately 343 meters per second (29 microseconds per centimeter)
    # Calculate the distance in centimeters
    distance_cm = pulse_duration / 29 / 2

    return distance_cm


while True:
    # Measure distance and print the result
    distance = measure_distance()
    print(f"Distance: {distance} cm")

    # Wait for a short duration before the next measurement
    utime.sleep(1)