import machine
from machine import Pin, SoftI2C
import dht
import network
import time
from time import sleep
import ujson
from lcd_api import LcdApi
from i2c_lcd import I2cLcd
from umqtt.simple import MQTTClient

# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_USER      = ""
MQTT_PASSWORD  = ""
MQTT_TOPIC     = "tah"
MQTT_TOPIC2    = "mess"

I2C_ADDR = 0x27
totalRows = 2
totalColumns = 16

i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=10000)

lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns)

sensor = dht.DHT22(Pin(23))

led_red=Pin(32,Pin.OUT)   
led_blue=Pin(33,Pin.OUT)   

buzzer=Pin(26,Pin.OUT) 

print("Connecting to WiFi", end="")
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('Wokwi-GUEST', '')
while not sta_if.isconnected():
  print(".", end="")
  time.sleep(0.1)
print(" Connected!")

print("Connecting to MQTT server... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
client.connect()

print("Connected!")


last_temp=0
last_hum=0
while True:
    sensor.measure()
    temp = sensor.temperature()
    hum = sensor.humidity()
    if temp<18 or temp>25:
      led_red.value(1)
    else:
      led_red.value(0)
    if hum<20 or hum>60:
      led_blue.value(1)
    else:
      led_blue.value(0)
    if temp!=last_temp or hum!=last_hum:
      lcd.clear()
      lcd.putstr("Temp: %3.1f C\n" %temp)
      lcd.putstr("Hum: %3.1f %%" %hum)
      last_temp=temp
      last_hum=hum
      message = ujson.dumps({
      "temp": temp,
      "humidity": hum,
      })
      print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
      client.publish(MQTT_TOPIC, message)