import machine
import time
import dht
import pico_i2c_lcd 

sensor = dht.DHT22(machine.Pin(22))
i2c = machine.I2C(0, sda=machine.Pin(0), scl=machine.Pin(1), freq=400000)
I2C_ADDR = i2c.scan()[0]
lcd = pico_i2c_lcd.I2cLcd(i2c, I2C_ADDR, 2, 16)

old_temp = 100000
old_hum = 100000

lcd.putstr("TEMP: waiting...\n")
lcd.putstr(" HUM: waiting...")

def writeTemp(temp):
    # temp_f = temp * (9/5) + 32.0
    lcd.move_to(5, 0)
    lcd.putstr("           ")
    lcd.move_to(5, 0)
    lcd.putstr(" "+str(temp) + "C")
    # lcd.putstr(" "+str(temp) + "C "+str(temp_f)+"F")

def writeHum(hum):
    lcd.move_to(5, 1)
    lcd.putstr("           ")
    lcd.move_to(5, 1)
    lcd.putstr(" "+str(hum) + "%")

while True:
    print(I2C_ADDR)
    try:
        time.sleep(2)
        sensor.measure()
        temp = sensor.temperature()
        hum = sensor.humidity()           

        if old_temp != temp:
            writeTemp(temp)

        if  old_hum != hum:
            writeHum(hum)

        old_hum = hum
        old_temp = temp

    except OSError as e:
        print('Failed to read sensor.')