esp32+MQTT如何使用4G和MicroPython设置订阅温度传感器的主题并在HA上显示
时间: 2023-05-21 16:02:07 浏览: 81
您可以使用MicroPython中的umqtt.simple库来连接到MQTT代理并订阅主题。以下是一个示例代码:
```python
import machine
from umqtt.simple import MQTTClient
# 设置4G模块的APN和MQTT代理信息
apn = 'your_apn'
mqtt_server = 'your_mqtt_server'
mqtt_port = 1883
mqtt_user = 'your_mqtt_user'
mqtt_password = 'your_mqtt_password'
# 连接到4G网络
machine.Pin(4, machine.Pin.OUT).value(1) # 打开4G模块电源
time.sleep(2) # 等待4G模块启动
import network
from network import LTE
lte = LTE()
lte.attach(apn)
while not lte.isattached():
time.sleep(0.5)
lte.connect()
while not lte.isconnected():
time.sleep(0.5)
# 连接到MQTT代理
client_id = 'esp32'
client = MQTTClient(client_id, mqtt_server, mqtt_port, mqtt_user, mqtt_password)
client.connect()
# 订阅温度传感器主题
topic = b'temperature'
client.subscribe(topic)
# 在HA上显示温度
import ujson
from machine import Pin
from onewire import DS18X20
from onewire import OneWire
ow = OneWire(Pin(12))
ds = DS18X20(ow)
roms = ds.scan()
if len(roms) > 0:
while True:
ds.convert_temp()
time.sleep_ms(750)
for rom in roms:
temp = ds.read_temp(rom)
print('Temperature:', temp)
payload = ujson.dumps({'temperature': temp})
client.publish(topic=b'temperature', msg=payload)
time.sleep(5)
else:
print('No temperature sensor found')
```
在这个示例中,我们首先连接到4G网络,然后连接到MQTT代理并订阅温度传感器主题。然后,我们使用DS18B20温度传感器读取温度,并将其发布到MQTT代理上。最后,在HA上显示温度,您可以使用MQTT传感器组件来实现。