使用MIcroPython的方法通过esp32和4G设备和MQTT协议实时获取网络时间

好的，我可以回答这个问题。以下是一个计算班级平均成绩的 Python 程序：

scores = []
while True:
    score = float(input("请输入学生成绩："))
    if score < 0:
        break
    scores.append(score)

average = sum(scores) / len(scores)
print("班级平均成绩为：", average)

教师可以依次输入每个学生的成绩，输入负数表示结束输入，程序会自动计算班级平均成绩并打印出来。

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使用MicroPython编程的方式通过ESP32和4G模块实时显示时间

以下是使用MicroPython编程的方式通过ESP32和4G模块实时显示时间的示例代码：

import machine
import time
import network
import socket
import json

from dht import DHT11
from machine import Pin, I2C
from ssd1306 import SSD1306_I2C
from umqtt.simple import MQTTClient

# Define 4G module IP address and port number
SERVER = "xx.xx.xx.xx" # Replace with your 4G module IP address
PORT = 1883

# Define MQTT topics
TOPIC_TIME = b"home/time"

# Connect to WiFi
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect("YOUR_SSID", "YOUR_PASSWORD")

# Connect to MQTT broker
mqtt_client = MQTTClient("esp32", SERVER, PORT)
mqtt_client.connect()

# Initialize OLED display
i2c = I2C(scl=Pin(22), sda=Pin(21))
oled = SSD1306_I2C(128, 64, i2c)

# Initialize DHT11 sensor
dht11 = DHT11(Pin(5))

while True:
    # Get current time
    current_time = time.localtime()

    # Publish current time to MQTT broker
    time_payload = json.dumps({
        "hour": current_time[3],
        "minute": current_time[4],
        "second": current_time[5]
    })
    mqtt_client.publish(TOPIC_TIME, time_payload)

    # Read temperature and humidity from DHT11 sensor
    dht11.measure()
    temperature = dht11.temperature()
    humidity = dht11.humidity()

    # Display current time, temperature, and humidity on OLED display
    oled.fill(0)
    oled.text("Time: {:02d}:{:02d}:{:02d}".format(current_time[3], current_time[4], current_time[5]), 0, 0)
    oled.text("Temp: {} C".format(temperature), 0, 20)
    oled.text("Humidity: {}%".format(humidity), 0, 40)
    oled.show()

    time.sleep(1)

这段代码使用了MicroPython的网络库和MQTT库来连接到4G模块并发布当前时间的消息。它还使用了DHT11传感器来读取温度和湿度，并将它们显示在OLED显示屏上。请注意，您需要将代码中的“YOUR_SSID”和“YOUR_PASSWORD”替换为您的WiFi SSID和密码，以及将“xx.xx.xx.xx”替换为您的4G模块的IP地址。

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：

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：

import upip
upip.install('micropython-umqtt.robust')