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 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") msg = bytearray(b"x04MQTTx04x02") 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") self.sock.close() def ping(self): self.sock.write(b"xc0") def publish(self, topic, msg, retain=False, qos=1): pkt = bytearray(b"x30") 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") 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"x40x02") 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 MQTTClient from machine import Pin import dht import machine import micropython import 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ID CLIENT_ID = "aa485f13cfberw3b0" #这些都要根据你自己设置的改 TOPIC = b"status/online" #产品ID username='james' #产品APIKey: password='huaxinfeng520' state = 0 #读取DTH11 d = 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 arr def 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 mqtt mqtt.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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