esp32+MQTT如何使用4G和MicroPython设置订阅温度传感器的主题·
时间: 2023-05-21 12:02:04 浏览: 585
您可以使用Pycom GPy或FiPy等ESP32开发板,以及MicroPython和MQTT库来设置订阅温度传感器的主题。首先,您需要将ESP32连接到4G网络,然后使用MQTT库连接到MQTT代理服务器。接下来,您可以使用MQTT库订阅温度传感器的主题,并在接收到传感器数据时执行相应的操作。具体的代码实现可以参考MQTT库的文档和示例。
相关问题
esp32+4G+MQTT如何使用MicroPython设置订阅温度传感器的主题·
您可以使用以下代码来设置订阅温度传感器的主题:
```python
import machine
import ubinascii
import ujson
from umqtt.robust import MQTTClient
# Replace with your own values
WIFI_SSID = "your_wifi_ssid"
WIFI_PASSWORD = "your_wifi_password"
MQTT_BROKER = "your_mqtt_broker"
MQTT_PORT = 1883
MQTT_USER = "your_mqtt_user"
MQTT_PASSWORD = "your_mqtt_password"
TOPIC = "your_topic"
# Connect to WiFi
station = machine.RTC().memory()
if not station.get('ssid'):
station.set('ssid', WIFI_SSID)
station.set('wifi_pw', WIFI_PASSWORD)
machine.reset()
else:
import network
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(station.get('ssid'), station.get('wifi_pw'))
while not wlan.isconnected():
pass
# Connect to MQTT broker
client_id = ubinascii.hexlify(machine.unique_id()).decode()
client = MQTTClient(client_id, MQTT_BROKER, MQTT_PORT, MQTT_USER, MQTT_PASSWORD)
client.connect()
# Subscribe to topic
client.subscribe(TOPIC)
# Define callback function
def sub_cb(topic, msg):
print((topic, msg))
# Wait for messages
client.set_callback(sub_cb)
while True:
client.wait_msg()
```
请注意,您需要安装 umqtt.robust 库来使用此代码。您可以使用以下命令在 MicroPython 中安装该库:
```python
import upip
upip.install('micropython-umqtt.robust')
```
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
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。