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

echo = Pin(19, Pin.IN)
trigger = Pin(20, Pin.OUT)
BETA = 3950
sensor=ADC(Pin(27))

def display(distance,temp):
    cmd_wrt(0x80)
    string_write("DIS:")
    string_write(str(int(distance)))
    string_write("cm")
    if distance>10:
        string_write(",  far")
    else: 
        string_write(",   near")

    cmd_wrt(0xc0)
    string_write("TEMP:")
    string_write(str(int(temp)))
    string_write("^C")
    if temp>30:
        string_write(",   hot")
    else:  
        string_write(", cold")


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

def get_temp():
    nilai=sensor.read_u16()
    celsius = 1 / (log(1/(65535.00/nilai - 1)) / BETA + 1.0 / 298.15) - 273.15;
    print("temperature",celsius,"^C")
    return celsius

lcd_start()

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