def do_connect():
    import network
    sta_if = network.WLAN(network.STA_IF)
    ap_if = network.WLAN(network.AP_IF)
    if ap_if.active():
        ap_if.active(False)
    if not sta_if.isconnected():
        print('connecting to network...')
    sta_if.active(True)
    sta_if.connect('Wokwi-GUEST', '') #wifi的SSID和密码
    while not sta_if.isconnected():
        pass
    print('network config:', sta_if.ifconfig())
do_connect()

boot.py

diagram.json

main.py

from simple import MQTTClient
from machine import Pin,ADC
import machine, time, math
import micropython
from machine import Timer
import dht
import ujson
# 设置开关引脚
s1=Pin(19,Pin.IN)
s2=Pin(21,Pin.IN)
s3=Pin(22,Pin.IN)

#设置滑动变阻器的引脚
red_pot_pin = ADC(Pin(34,Pin.IN))    
green_pot_pin = ADC(Pin(35,Pin.IN))    
blue_pot_pin = ADC(Pin(32,Pin.IN))     

led_r=Pin(2,Pin.OUT) # 设置红灯电位器的引脚
led_g=Pin(5,Pin.OUT) # 设置绿灯电位器的引脚
led_b=Pin(18,Pin.OUT) # 设置蓝灯电位器的引脚
ledr=machine.PWM(machine.Pin(2),freq=50) 
ledg=machine.PWM(machine.Pin(5),freq=50)
ledb=machine.PWM(machine.Pin(18),freq=50)

# MQTT服务器地址域名
SERVER = "broker.emqx.io"
# 设备ID写自己姓名全称拼音_client1或者client2
CLIENT_ID = "wangzhiyong_client1"
# 主题写自己姓名拼音加学号
MQTT_TOPIC = b"wangzhiyong2206051001"
username = ""
password = ""
sensor = dht.DHT22(Pin(13)) #温湿度DHT22
prev_message = ""

def sensorpubl(s):
    global client, prev_message
    print("Measuring messge conditions... ", end="")
    sensor.measure()
    #发送数据
    message = ujson.dumps({
        "temp": sensor.temperature(),
        "humidity": sensor.humidity(),
        "switchs": s1.value()*4+s2.value()*2+s3.value(),
        #"slide":red_brightness,

    })
    if message != prev_message:
        print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
        client.publish(MQTT_TOPIC, message)
        prev_message = message
    else:
        print("No change")

def main(server=SERVER):
    global client
    client = MQTTClient(CLIENT_ID, server)#连接mqttx
    client.connect()
    #client.subscribe(TOPIC2)
    #print("Connected to %s, subscribed to %s topic" % (server, TOPIC))
    tim=Timer(-1)
    tim.init(period=2000,mode=Timer.PERIODIC,callback=sensorpubl)
    try:
        while 1:
            #client.wait_msg()
            led_r.value(s1.value())
            led_g.value(s2.value())
            led_b.value(s3.value())
            time.sleep(1)
            red_brightness = int(red_pot_pin.read() / 4)    # 读取红灯电位器的值并缩小范围
            green_brightness = int(green_pot_pin.read() / 4)  # 读取绿灯电位器的值并缩小范围
            blue_brightness = int(blue_pot_pin.read() / 4)   # 读取蓝灯电位器的值并缩小范围
            ledr.duty(red_brightness)        # 设置红灯亮度
            ledg.duty(green_brightness)    # 设置绿灯亮度
            ledb.duty(blue_brightness)      # 设置蓝灯亮度
    finally:
        client.disconnect()

mqtt.py

import usocket as socket
import ustruct as struct
from ubinascii import hexlify

class MQTTException(Exception):
    pass

class MQTTClient:

    def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
                 ssl=False, ssl_params={}):
        if port == 0:
            port = 8883 if ssl else 1883
        self.client_id = client_id
        self.sock = None
        self.server = server
        self.port = port
        self.ssl = ssl
        self.ssl_params = ssl_params
        self.pid = 0
        self.cb = None
        self.user = user
        self.pswd = password
        self.keepalive = keepalive
        self.lw_topic = None
        self.lw_msg = None
        self.lw_qos = 0
        self.lw_retain = False

    def _send_str(self, s):
        self.sock.write(struct.pack("!H", len(s)))
        self.sock.write(s)

    def _recv_len(self):
        n = 0
        sh = 0
        while 1:
            b = self.sock.read(1)[0]
            n |= (b & 0x7f) << sh
            if not b & 0x80:
                return n
            sh += 7

    def set_callback(self, f):
        self.cb = f

    def set_last_will(self, topic, msg, retain=False, qos=0):
        assert 0 <= qos <= 2
        assert topic
        self.lw_topic = topic
        self.lw_msg = msg
        self.lw_qos = qos
        self.lw_retain = retain

    def connect(self, clean_session=True):
        self.sock = socket.socket()
        addr = socket.getaddrinfo(self.server, self.port)[0][-1]
        self.sock.connect(addr)
        if self.ssl:
            import ussl
            self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
        premsg = bytearray(b"\x10\0\0\0\0\0")
        msg = bytearray(b"\x04MQTT\x04\x02\0\0")

        sz = 10 + 2 + len(self.client_id)
        msg[6] = clean_session << 1
        if self.user is not None:
            sz += 2 + len(self.user) + 2 + len(self.pswd)
            msg[6] |= 0xC0
        if self.keepalive:
            assert self.keepalive < 65536
            msg[7] |= self.keepalive >> 8
            msg[8] |= self.keepalive & 0x00FF
        if self.lw_topic:
            sz += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
            msg[6] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
            msg[6] |= self.lw_retain << 5

        i = 1
        while sz > 0x7f:
            premsg[i] = (sz & 0x7f) | 0x80
            sz >>= 7
            i += 1
        premsg[i] = sz

        self.sock.write(premsg, i + 2)
        self.sock.write(msg)
        #print(hex(len(msg)), hexlify(msg, ":"))
        self._send_str(self.client_id)
        if self.lw_topic:
            self._send_str(self.lw_topic)
            self._send_str(self.lw_msg)
        if self.user is not None:
            self._send_str(self.user)
            self._send_str(self.pswd)
        resp = self.sock.read(4)
        assert resp[0] == 0x20 and resp[1] == 0x02
        if resp[3] != 0:
            raise MQTTException(resp[3])
        return resp[2] & 1

    def disconnect(self):
        self.sock.write(b"\xe0\0")
        self.sock.close()

    def ping(self):
        self.sock.write(b"\xc0\0")

    def publish(self, topic, msg, retain=False, qos=0):
        pkt = bytearray(b"\x30\0\0\0")
        pkt[0] |= qos << 1 | retain
        sz = 2 + len(topic) + len(msg)
        if qos > 0:
            sz += 2
        assert sz < 2097152
        i = 1
        while sz > 0x7f:
            pkt[i] = (sz & 0x7f) | 0x80
            sz >>= 7
            i += 1
        pkt[i] = sz
        #print(hex(len(pkt)), hexlify(pkt, ":"))
        self.sock.write(pkt, i + 1)
        self._send_str(topic)
        if qos > 0:
            self.pid += 1
            pid = self.pid
            struct.pack_into("!H", pkt, 0, pid)
            self.sock.write(pkt, 2)
        self.sock.write(msg)
        if qos == 1:
            while 1:
                op = self.wait_msg()
                if op == 0x40:
                    sz = self.sock.read(1)
                    assert sz == b"\x02"
                    rcv_pid = self.sock.read(2)
                    rcv_pid = rcv_pid[0] << 8 | rcv_pid[1]
                    if pid == rcv_pid:
                        return
        elif qos == 2:
            assert 0

    def subscribe(self, topic, qos=0):
        assert self.cb is not None, "Subscribe callback is not set"
        pkt = bytearray(b"\x82\0\0\0")
        self.pid += 1
        struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
        #print(hex(len(pkt)), hexlify(pkt, ":"))
        self.sock.write(pkt)
        self._send_str(topic)
        self.sock.write(qos.to_bytes(1, "little"))
        while 1:
            op = self.wait_msg()
            if op == 0x90:
                resp = self.sock.read(4)
                #print(resp)
                assert resp[1] == pkt[2] and resp[2] == pkt[3]
                if resp[3] == 0x80:
                    raise MQTTException(resp[3])
                return

    # Wait for a single incoming MQTT message and process it.
    # Subscribed messages are delivered to a callback previously
    # set by .set_callback() method. Other (internal) MQTT
    # messages processed internally.
    def wait_msg(self):
        res = self.sock.read(1)
        self.sock.setblocking(True)
        if res is None:
            return None
        if res == b"":
            raise OSError(-1)
        if res == b"\xd0":  # PINGRESP
            sz = self.sock.read(1)[0]
            assert sz == 0
            return None
        op = res[0]
        if op & 0xf0 != 0x30:
            return op
        sz = self._recv_len()
        topic_len = self.sock.read(2)
        topic_len = (topic_len[0] << 8) | topic_len[1]
        topic = self.sock.read(topic_len)
        sz -= topic_len + 2
        if op & 6:
            pid = self.sock.read(2)
            pid = pid[0] << 8 | pid[1]
            sz -= 2
        msg = self.sock.read(sz)
        self.cb(topic, msg)
        if op & 6 == 2:
            pkt = bytearray(b"\x40\x02\0\0")
            struct.pack_into("!H", pkt, 2, pid)
            self.sock.write(pkt)
        elif op & 6 == 4:
            assert 0

    # Checks whether a pending message from server is available.
    # If not, returns immediately with None. Otherwise, does
    # the same processing as wait_msg.
    def check_msg(self):
        self.sock.setblocking(False)
        return self.wait_msg()
