from machine import Pin, SoftI2C
from utime import sleep_us, ticks_us, sleep
from i2c_lcd import I2cLcd
 
trigger = Pin(25, Pin.OUT)
echo = Pin(33, Pin.IN)
 
def ultra():
    trigger.off()
    sleep_us(2)
    trigger.on()
    sleep_us(5)
    trigger.off()
 
    while echo.value() == 0:
        signal_off = ticks_us()
    while echo.value() == 1:
        signal_on = ticks_us()
 
    try:
        time_pass = signal_on - signal_off
    except NameError:
        return 0
    return time_pass / 58
i2c = SoftI2C(sda=Pin(21), scl=Pin(22))
lcd = I2cLcd(i2c, 0x27, 2, 16)
while True:
    dist = ultra()
    print(f'Distance: {dist:.2f}cm')
    sleep(0.5)
    lcd.putstr(f'{dist:.2f}cm')