Python对接OneNet云平台实现物联网开发

本次项目设计的是厨房安全监控系统，基于ESP8266WiFi模块进行数据发送，利用Arduino开发板集成ESP8266模块，采集传感器检测的数据，然后用WiFi发送到指定的OneNet云平台的设备地址，使用Python的Flask框架对接云平台，获取数据自动保存到数据库中，前端利用Ajax进行数据访问的操作，结果以列表的形式在浏览器上展示。

1.准备开发环境：Pycharm，Python3.x，MySQL，Navicat，WebStorm/Sublime/VSCode，Arduino IDE；

开发板：WeMosD１R3继承了ESP8266模块，在Arduino IDE首选项中的开发板地址粘贴以下地址:

https://github.com/esp8266/Arduino/releases/download/2.5.0/package_esp8266com_index.json

然后在开发板中点击开发板管理,输入ESP8266,点击ESP8266Community进行安装,之后点击开发板选择WeMosD1开发板.

连接各类传感器,我这里使用的是火焰传感器,人体红外传感器,温湿度传感器,一氧化碳传感器分别检测厨房的火焰,温度,人员和燃气值,使用继电器控制风扇的转动,加上蜂鸣器和LED进行报警功能.

硬件部分代码:

#include 
#include 
#include 
#include "DHT.h"

//初始化数据包和引脚
HttpPacketHead packet;
#define myPeriodic 5
#define DHTPIN 5
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

int LED = D1;      //LED
int human = D3;    //人体
int fire = D2;     //火焰
int gas_pin = A0;  //MQ-2模拟口
int gas = D6;      //MQ-2数据口
int buzzer = D8;   //蜂鸣器
int relayPin = D10;  //继电器

//配置路由器和
int sent = 0;
char OneNetServer[] = "api.heclouds.com";  //云平台网址
const char ssid[] = " ";			   //路由器名称
const char password[] = " ";		   //路由器密码
char device_id[] = " ";
char API_KEY[] = " ";	//设备api_key地址
//发送的数据
char sensor_id1[] = "温度";
char sensor_id2[] = "火焰";					
char sensor_id3[] = "燃气";
char sensor_id4[] = "人员";

//连接路由器
void connectWifi()
{  Serial.print("Connecting to " + *ssid);
 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED) {
   delay(1000);
   Serial.print(".");  
   }
 Serial.println("");
 Serial.println("Connected");
 Serial.println("");
 digitalWrite(0, HIGH);
 delay(1000);
 digitalWrite(0, LOW);
 delay(1000);
 digitalWrite(0,HIGH);
}

//发送数据给云平台
void postDataToOneNet(char* API_VALUE_temp, char* device_id_temp, char* sensor_id_temp, float thisData)
{  WiFiClient client;
 StaticJsonBuffer<250> jsonBuffer;
 JsonObject& myJson = jsonBuffer.createObject();
 JsonArray& datastreams= myJson.createNestedArray("datastreams");
 JsonObject& id_datapoints = datastreams.createNestedObject();
 id_datapoints["id"] = sensor_id_temp;
   JsonArray& datapoints = id_datapoints.createNestedArray("datapoints");
 JsonObject& value = datapoints.createNestedObject();
   value["value"] =thisData;
 char p[180];
 myJson.printTo(p, sizeof(p));
 packet.setHostAddress(OneNetServer);
 packet.setDevId(device_id_temp);
 packet.setAccessKey(API_VALUE_temp);
 packet.createCmdPacket(POST, TYPE_DATAPOINT, p);
 if (strlen(packet.content))
   Serial.print(packet.content);
 Serial.println(p);
 char cmd[400];
 memset(cmd, 0, 400);  
 strcpy(cmd, packet.content);
 strcat(cmd, p);
 if (client.connect(OneNetServer, 80)) { 
   Serial.println("WiFi Client connected ");
   client.print(cmd);
   delay(1000);
 }
 client.stop();
}

//传感器初始化
void setup() {
 pinMode(A0,INPUT);
 pinMode(LED,OUTPUT);         // LED为输出模式
 pinMode(buzzer, OUTPUT); 
 pinMode(relayPin, OUTPUT); 
 pinMode(human, INPUT); //设置人体红外接口为输入状态
 pinMode(fire,INPUT);
 Serial.begin(9600); 
 connectWifi();
}

//主循环程序
void loop() {
 int t = dht.readTemperature();
 int x = analogRead(A0);
 int gas = 5.00*(x/1023.00);
 int h = digitalRead(human);
 int f = digitalRead(fire);
 if(t>25){
    digitalWrite(LED,HIGH);
    digitalWrite(relayPin,HIGH);
    digitalWrite(buzzer,HIGH);
 }
 if(gas>280){
    digitalWrite(LED,HIGH);
    digitalWrite(relayPin,HIGH);
    digitalWrite(buzzer,HIGH);
 }
 postDataToOneNet(API_KEY, device_id, sensor_id1, t);
 delay(100);
 postDataToOneNet(API_KEY, device_id, sensor_id2, f);
 delay(100);
 postDataToOneNet(API_KEY, device_id, sensor_id3, gas);
 delay(100);
 postDataToOneNet(API_KEY, device_id, sensor_id4, h);
 sent++;
 int count = myPeriodic;
 while (count--){
   delay(1000);
 }
 delay(100);    
}

2.Flask框架进行数据库连接配置:

import os

debug = True

HOSTNAME = 'localhost'
PORT = '3306'
DATABASE = 'kitchen'
USERNAME = 'root'
PASSWORD = '123456'
DB_URI = "mysql+pymysql://{}:{}@{}:{}/{}?charset=utf8".format(USERNAME, PASSWORD, HOSTNAME, PORT, DATABASE)
SQLALCHEMY_DATABASE_URI = DB_URI

SQLALCHEMY_TRACK_MODIFICATIONS = False

SECRET_KEY = os.urandom(24)

编写主程序代码:

import urllib
import re
from flask import Flask,render_template
from flask_sqlalchemy import SQLAlchemy
from flask_wtf import FlaskForm
from flask_login import LoginManager
from wtforms import StringField,PasswordField,SubmitField
from wtforms.validators import DataRequired, EqualTo, ValidationError
from datetime import datetime

import config

#初始化Flask程序
app = Flask(__name__)
app.config.from_object(config)
db = SQLAlchemy(app)    #绑定app对象到数据库
login_manager = LoginManager(app)

#自己的设备ID和api_key
DEVICE_ID = '*****'
API_KEY = '*********'

#创建设备表
class Device(db.Model):
    __tabelname__ = 'Device'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True, nullable=False)
    temp = db.Column(db.String(10), nullable=False)
    fire = db.Column(db.String(10), nullable=False)
    gas = db.Column(db.String(10), nullable=False)
    human = db.Column(db.String(10), nullable=False)
    time = db.Column(db.DateTime, default=datetime.now())


@app.route('/')
def getData():
    #指定设备数据流url
    url = 'http://api.heclouds.com/devices/' + DEVICE_ID + '/datapoints'
    #访问该url
    request = urllib.request.Request(url)
    request.add_header('api-key', API_KEY)
    #设置HTTP的访问方式为GET请求
    request.get_method = lambda: 'GET'
    #request获取到了设备的数据流
    request = urllib.request.urlopen(request)
    text = str(request.read())
    #对字符串进行解析
    text = text[text.find("data") + 6:]
    text = re.sub('[\/]', '', text)
    text = text[text.find("value") + 7:]
    temp = text[0]+text[1]
    if text[1] == "}":
        text[1] = " "
    text = text[text.find("value")+7:]
    if text[1] == "}":
        print("燃气值: "+text[0])
        gas = text[0]
    elif text[2] == "}":
        print("燃气值: "+text[0]+text[1])
        gas = text[0]+text[1]
    else:
        print("燃气值: " + text[0] + text[1] + text[2])
        gas = text[0]+text[1]+text[2]
    text = text[text.find("value")+7:]
    status = ""
    human  = ""
    if text[0] == "1":
        status = "有火"
    elif text[0] == "0":
        status = "无火"
    text = text[text.find("value") + 7:]
    if text[0] == "1":
        human = "有人"
    elif text[0] == "0":
        human = "无人"
    else:
        human = "有人"
    print("火焰: " + status)
    print("温度: " + temp)
    value = Device(temp=temp, fire=status, gas=gas, human=human,time=datetime.now())
    db.session.add(value)
    db.session.commit()
    Device_list = Device.query.all()
    return render_template("device.html",devices = Device_list)

if __name__ == '__main__':
    db.create_all()
    app.run()

3.前端部分代码:

    
    
    
    
    
    


基于ESP8266的厨房安全监控系统
    
设备数据信息
    
            {% for device in devices %}
             
            {% endfor %}
        

        

        

            
温度
            
火焰
            
燃气
            
人员
            
时间
        

            
    温度: {{ device.temp}}  
            
    火焰: {{ device.fire}}  
            
    燃气: {{ device.gas}}   
            
    人员: {{ device.human}} 
            
    时间: {{ device.time}}  
             
        

        
    

最后的运行结果如图所示: