//Code:
//"""
//IoT Weather Station Example using Wokwi.com
//To view the data:
//20 | P a g e
//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, ANIRUDH DSU
//"""
import network
import time
from machine import Pin
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 = "IOT-weather"
sensor = dht.DHT22(Pin(15))
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 = ""
while True:
print("Measuring weather conditions... ", end="")
sensor.measure()
message = ujson.dumps({
"temp": sensor.temperature(),
"humidity": sensor.humidity(),
})
if message != prev_weather:
print("Updated!")
//22 | P a g e
print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC,
message))
client.publish(MQTT_TOPIC, message)
prev_weather = message
else:
print("No change")
time.sleep(1)