import network
import time
from machine import Pin
import dht
import ujson
from umqtt.simple import MQTTClient
from machine import Pin, I2C
import ssd1306
# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython-weather-demo"
MQTT_BROKER = "broker.mqttdashboard.com"
MQTT_USER = ""
MQTT_PASSWORD = ""
MQTT_TOPIC = "wokwi-weather"
sensor = dht.DHT22(Pin(15))
# ESP32 Pin assignment
i2c = I2C(0, scl=Pin(22), sda=Pin(21)) #显示屏连接GPIIO 21 、22
buzzer_pin = Pin(5, Pin.OUT) # 蜂鸣器连接到GPIO 5
led_pin = Pin(0, Pin.OUT) # LED连接到GPIO 0
led_pin.off() # 初始时关闭LED
# 设定温湿度报警阈值
A=TEMP_THRESHOLD_HIGH = 30.0 # 高温报警阈值
B=TEMP_THRESHOLD_LOW = 15.0 # 低温报警阈值
C=HUMIDITY_THRESHOLD_HIGH = 80.0 # 高湿度报警阈值
D=HUMIDITY_THRESHOLD_LOW = 30.0 # 低湿度报警阈值
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
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()
temp = sensor.temperature()
humidity = sensor.humidity()
if (temp >= A or temp <= B) or (humidity >= C or humidity <= D):
# 触发蜂鸣器报警
buzzer_pin.on() # 蜂鸣器报警
time.sleep(1)
led_pin.on() # 点亮LED
time.sleep(0.5)
buzzer_pin.off() # 关闭蜂鸣器
led_pin.off() #关灯
message = ujson.dumps({
"temp": temp,
"humidity": humidity,
})
if message != prev_weather:
print("Updated!")
print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
try:
client.publish(MQTT_TOPIC, message)
except Exception as e:
print("MQTT publish failed:", e)
prev_weather = message
# 显示最新的温度和湿度
oled.fill(0) # 清除屏幕
oled.text('temp: {:.1f}'.format(temp), 10, 10)
oled.text('humidity: {:.1f}'.format(humidity), 0, 0)
oled.show()
else:
print("No change")
time.sleep(1)