from machine import Pin
import time

# Set pins for trigger and echo
trigger_pin = Pin(5, Pin.OUT)
echo_pin = Pin(18, Pin.IN)

# Send a trigger signal to the sensor
def trigger_sensor():
    trigger_pin.value(0)
    time.sleep_us(2)
    trigger_pin.value(1)
    time.sleep_us(10)
    trigger_pin.value(0)

# Calculate distance from the sensor to an object
def measure_distance():
    # Trigger sensor to start measuring distance
    trigger_sensor()
    
    # Wait for the echo signal to be received
    while echo_pin.value() == 0:
        pass
    start_time = time.ticks_us()
    
    while echo_pin.value() == 1:
        pass
    end_time = time.ticks_us()
    
    # Calculate the duration of the echo pulse
    pulse_duration = end_time - start_time
    
    # Convert the pulse duration to distance in cm
    distance = pulse_duration * 0.034 / 2
    
    return distance

# Measure distance continuously
while True:
    distance = measure_distance()
    print("Distance:", distance, "cm")
    time.sleep(1)