from machine import Pin, time_pulse_us
import utime
 
# Initializing pins for trigger and echo
trigger = Pin(27, Pin.OUT)
echo = Pin(26, Pin.IN)

# Continuously get distance measurements while the board has power
while True:
    # Trigger pulse
    trigger.low()
    utime.sleep_us(5)
    trigger.high()
    utime.sleep_us(12)
    trigger.low()
    
    # Wait for echo (timeout = 50ms)
    pulse_us = time_pulse_us(echo, 1, 50000)
    
    if pulse_us < 0:
        print("Error: No echo")  # Checking for errors
    else:
    # Converting time into distance
    # Sound travels at about 343 m/s, which is 0.0343 cm per microsecond
    # Dividing by 2 because the time includes both the trip to the object and the return
        distance_cm = (pulse_us / 2) * 0.0343
        print(f"Distance: {distance_cm:.1f} cm") # print the calculated distance value with 1 decimal place
    
    utime.sleep(0.5)