from lcdi2c import*
from machine import Pin,ADC
from utime import sleep
from math import log
from machine import Pin,time_pulse_us
from time import sleep,sleep_us

echo = Pin(19, Pin.IN)
trigger = Pin(20, Pin.OUT)

def display(distance):
    cmd_wrt(0x80)
    string_write("DISTANCE:")
    string_write(str(int(distance)))
    string_write("cm")

def get_distance():
    trigger.value(1)
    sleep_us(10)
    trigger.value(0)
    timing = time_pulse_us(echo,1,1000000)
    if timing<0:
        print("error measurement")
    else:
        distance=timing/58
        print("distance",distance,"cm")
    return distance

lcd_start()

while 1:
    display(get_distance())
    sleep(0.2)