"""
MicroPython IoT Weather Station Example for Wokwi.com

To view the data:

1. Go to http://www.hivemq.com/demos/websocket-client/
2. Click "Connect"
3. Under Subscriptions, click "Add New Topic Subscription"
4. In the Topic field, type "wokwi-weather" then click "Subscribe"

Now click on the DHT22 sensor in the simulation,
change the temperature/humidity, and you should see
the message appear on the MQTT Broker, in the "Messages" pane.

Copyright (C) 2022, Uri Shaked

https://wokwi.com/arduino/projects/322577683855704658
"""
# Al codigo inicial, se anexa el potenciometro PWM para ser importado.
import network
import time
from machine import Pin, PWM
import dht
import ujson
from umqtt.simple import MQTTClient

# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython-weather-demo"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_USER      = ""
MQTT_PASSWORD  = ""
MQTT_TOPIC     = "wokwi-weather"

# Esta línea de código inicializa un objeto DHT22 llamado "sensor" y lo configura para #comunicarse 
#con Arduino a través del pin digital 15. Una vez hecho esto, puede usar los métodos proporcionados 
#por la biblioteca DHT22 para leer los datos de temperatura y humedad del sensor, se adiciona el servo con 
#su configuración pin 18 a una frecuencia de 50Hz. 
sensor = dht.DHT22(Pin(15))
servo=PWM(Pin(18), freq=50)

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!")
prev_weather = ""
tmp=0 #se adiciona la variable temperatura.

while True:
  print("Measuring weather conditions... ", end="")
  sensor.measure() 
  tmp=sensor.temperature()
  print(tmp)
  message = ujson.dumps({
    "temp": sensor.temperature(),
    "humidity": sensor.humidity(),
  })
  if message != prev_weather:
    print("Updated!")
    print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
    client.publish(MQTT_TOPIC, message)
    prev_weather = message
  else:
    print("No change")
  time.sleep(1)

#Se realiza un condicional para indicarle que si el sensor de temperatura supera los 22° correspondientes a
#temperatura ambiente en Medellin, Colombia entonces realice el movimiento del servomotor de lo contrario mantenga
#ciclo del servomotor en su posición inicial

  if sensor.temperature()>22:
    for i in range(1800, 8000):
      print(sensor.temperature())
      servo.duty_u16(i)
      time.sleep_ms(1)
  else:
    servo.duty_u16(1)