Python物联网开发入门指南：如何用Python轻松连接智能设备？

import socket
import struct

s = socket.socket(socket.af_inet, socket.sock_dgram)
s.bind(('localhost', 8889)) # 指定端口号
while true:
    data, addr = s.recvfrom(1024)
    rssi = struct.unpack('<b',data[len('rssi:'):])[0] # 获取 rssi 值
    print("received:",rssi,"dbm from",addr)

import bluetooth
import sys

address = "f7:ca:e6:c1:d4:b9" # 目标蓝牙地址

try:
    sock=bluetooth.bluetoothsocket(bluetooth.rfcomm)
    sock.connect((address, 1))

    while true:
        data = sock.recv(1024).decode()
        if len(data)>0:
            items = data.split(',')
            lat = float(items[0]) # 获取纬度
            lng = float(items[1]) # 获取经度
            altitude = int(items[2]) # 获取高度
            print("latitude:",lat,"longitude:",lng,"altitude:",altitude,"m")

except bluetooth.btcommon.bluetootherror as err:
    print("failed to connect device,",err)
finally:
    try:
        sock.close()
    except nameerror:
        pass

import paho.mqtt.client as mqtt
import time

broker_address="mqtt.thingspeak.com"
port=1883
topic="channels/1417/publish/"
message="field1=%d&field2=%d"%(time.time(),int(random.randint(0,10)*10))

def on_connect(client, userdata, flags, rc):
    if rc==0:
        client.connected_flag=true
        print("connected with result code "+str(rc))
    else:
        print("bad connection returned code=",rc)


def on_disconnect(client,userdata,rc):
    client.connected_flag=false
    print("disconnected with result code "+str(rc))


client=mqtt.client()
client.on_connect=on_connect
client.on_disconnect=on_disconnect

client.username_pw_set("your_user_name","your_password")
client.connect(broker_address,port)
client.loop_start()

while not client.connected_flag:
    print("connecting...")
    time.sleep(1)

print("publishing message:",message)
result=client.publish(topic,message)
print("publish result:",result)

import requests

url = 'http://api.openweathermap.org/data/2.5/weather?q={city}&appid={apikey}'
params = { 'q': 'london', 'appid': 'your_api_key' }
response = requests.get(url.format(**params)).json()
if response['cod'] == 200:
    temperature = round(float(response['main']['temp']) - 273.15, 2)
    description = response['weather'][0]['description'].title()
    windspeed = str(response['wind']['speed']) +'m/s'
    print(f"temperature in london is {temperature}°c and it's {description}. wind speed is {windspeed}")
else:
    print("city not found or server error.")

import random
import datetime
from pyqt5 import qtcore, qtgui, qtwidgets

class ui_form(object):

    def setupui(self, form):
        form.setobjectname("form")
        form.resize(400, 300)

        self.label = qtwidgets.qlabel(form)
        self.label.setgeometry(qtcore.qrect(10, 10, 381, 201))
        font = qtgui.qfont()
        font.setbold(true)
        font.setweight(75)
        self.label.setfont(font)
        self.label.settext("")
        self.label.setobjectname("label")

        self.retranslateui(form)
        qtcore.qmetaobject.connectslotsbyname(form)

    def retranslateui(self, form):
        _translate = qtcore.qcoreapplication.translate
        form.setwindowtitle(_translate("form", "smart projection"))

class smartprojection(qtwidgets.qwidget):

    def __init__(self, parent=none):
        super().__init__(parent)
        self._ui = ui_form()
        self._ui.setupui(self)
        self.showtime()

    @qtcore.pyqtslot()
    def showtime(self):
        now = datetime.datetime.now().strftime('%h:%m')
        projectorcontent = ""
        if (now >= "06:00" and now < "12:00"):
            projectorcontent += "good morning! the weather outside looks very nice today."
        elif (now >= "12:00" and now < "18:00"):
            projectorcontent += "good afternoon! enjoy the beautiful weather you have."
        else:
            projectorcontent += "good evening! have a great day for sleep!"

        contenttodisplay = f"<h1>{projectorcontent}</h1><p>the current date and time is: {datetime.datetime.now().strftime('%y-%m-%d %h:%m:%s')}</p>"
        self._ui.label.settext(contenttodisplay)
        qtcore.qtimer.singleshot(1000 * 60 * 1, self.showtime)

app = qtwidgets.qapplication([])
window = smartprojection()
window.show()
app.exec_()

import cv2
import numpy as np
import face_recognition
import threading

cap = cv2.videocapture(0)
cap.set(cv2.cap_prop_frame_width, 640)
cap.set(cv2.cap_prop_frame_height, 480)

known_face_encodings = []
known_face_names = []

# load known faces
with open('./faces.txt','r') as file:
    lines = file.readlines()
    for line in lines:
        encoding = line[:line.index(',')]
        name = line[line.index(',')+1:-1].strip('\n').strip('\t')
        known_face_encodings.append(np.array(list(map(lambda x: float(x),encoding.split()))))
        known_face_names.append(name) 

def recognize():
    global cap
    while true:
        ret, frame = cap.read()
        rgb_frame = frame[:, :, ::-1]
        face_locations = face_recognition.face_locations(rgb_frame)
        face_encodings = face_recognition.face_encodings(rgb_frame, face_locations)
        for i in range(len(face_encodings)):
            matches = face_recognition.compare_faces(known_face_encodings, face_encodings[i], tolerance=0.6)
            name = "unknown"
            if true in matches:
                matchedidxs = [j for j, b in enumerate(matches) if b]
                counts = {}
                for matchidx in matchedidxs:
                    name = known_face_names[matchidx]
                    counts[name] = counts.get(name, 0) + 1

                name = max(counts, key=counts.get)

            top, right, bottom, left = face_locations[i]
            cv2.rectangle(frame, (left, top), (right, bottom),(0, 0, 255), 2)

            cv2.puttext(frame, name,(left,top-10), cv2.font_hershey_simplex, 0.75,(0, 255, 0), 2)

        cv2.imshow('face recognition', frame)
        if cv2.waitkey(1) & 0xff == ord('q'):
            break

thread = threading.thread(target=recognize)
thread.start()