Python控制单片机 TPYBoard MicroPython v202链接DTH11 温湿度 m

TPYBoard MicroPython v202链接DTH11 mqtt上传数据，具体实现。手打不易，给物联网人点个赞吧

先看效果图与硬件连接示意图

DHT连接示意图

前端展示：

一共四个python文件，我用的是GPIO5，代码这么写
simple.py应该这么写，这个是通过socket连接mqtt的简易包

import usocket as socketimport ustruct as structfrom ubinascii import hexlifyclass MQTTException(Exception):    passclass 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)        #print("---------------------")        #print(str(self.sock.read(1024)))        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=1):        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()

在boot.py应该这么写
这个是连接你的WiFi的，因为202带了一个8266的wifi芯片

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("AshCloud", "Passw0rd@1213|0412") #wifi的SSID和密码        while not sta_if.isconnected():                pass        print("network config:", sta_if.ifconfig())do_connect()#gc.collect()

连接以及读取数据mqtt.py
server用你自己的，我是在阿里云搭建的。

from simple import MQTTClientfrom machine import Pinimport dhtimport machineimport micropythonimport time#声明用到的类库，尤其是dht的类库import json#选择G4引脚p2 = Pin(2, Pin.OUT)p2.value(1)   # MQTT服务器地址域名为：183.230.40.39,不变SERVER = "youself server"#设备IDCLIENT_ID = "aa485f13cfberw3b0"#这些都要根据你自己设置的改TOPIC = b"status/online"#产品IDusername="james"#产品APIKey:password="huaxinfeng520"state = 0#读取DTH11d = dht.DHT11(machine.Pin(5))#声明用到类库中的函数，并设置参数led = Pin(2, Pin.OUT)h="0"t="0"#要上报的数据点z = {"h":h,"t":t}def pubdata(data):    j_d = json.dumps(data)        j_l = len(j_d)    arr = bytearray(j_l)    arr[0:] = j_d.encode("UTF-8") # json数据    return arrdef sub_cb(topic, msg):    global state    print((topic, msg))    if msg == b"on":            p2.value(1)            state = 1            print("1")    elif msg == b"off":            p2.value(0)            state = 0            print("0")    elif msg == b"toggle":            state = 1 - state            p2.value(state)           def main(server=SERVER):            print(json.dumps(z))    #端口号为：1883    c = MQTTClient(CLIENT_ID, server,1883,username,password)    c.set_callback(sub_cb)    c.connect()    c.subscribe(TOPIC)    print("Connected to %s, subscribed to %s topic" % (server, TOPIC))        while 1:                d.measure()#调用DHT类库中测量数据的函数        temp_=str(d.temperature())#读取measure()函数中的温度数据        hum_=str(d.humidity())#读取measure()函数中的湿度数据        print("wendu:",temp_,"-shidu:",hum_)        z["h"]=hum_        z["t"]=temp_        c.publish(topic=TOPIC,msg=pubdata(z))        time.sleep(3)        try:        while 1:                        c.wait_msg()    finally:            c.disconnect()

最后就是在main.py调用

import mqttmqtt.main()

前端代码如果需要可以找我微信:huadaxiano1
前端主要是解析数据set进Echarts里面去

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