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NodeMcu连接阿里云平台，加BMP280模块，主灯开关控制，实现温度压强数据的上云。

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成果演示

利用按钮操作可以直接控制nodemcu的led灯的亮灭，实时显示室内的温度和压强

硬件组成

一块Nodemcu开发板，bmp280模块

注意：在连接电路的时候要注意，SCL连接GPIO5，SDA连接GPIO4，利用IIC通信将数据传送给nodemcu开发板。

代码组成

这里只列举部分代码，这些代码也是借鉴别人自己改的，完整代码在
链接：
提取码：th87


#include <ESP8266WiFi.h>   //安装esp8266arduino开发环境
#include <PubSubClient.h>  //安装PubSubClient库
#include <ArduinoJson.h>   //json  V5版本
#include "aliyun_mqtt.h"
//需要安装crypto库
#include <Wire.h>
//#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>#define LED     D4
#define WIFI_SSID        "TP-LINK_6B29"//替换自己的WIFI
#define WIFI_PASSWD      "wg15385778716.."//替换自己的WIFI#define PRODUCT_KEY      "a1QA2EMzdKC" //替换自己的PRODUCT_KEY
#define DEVICE_NAME      "esp8266" //替换自己的DEVICE_NAME
#define DEVICE_SECRET    "12Q7UFMSloyEPxtJoKxewT2li7UMXw4i"//替换自己的DEVICE_SECRET#define DEV_VERSION       "S-TH-WIFI-v1.0-20190220"        //固件版本信息#define ALINK_BODY_FORMAT         "{"id":"123","version":"1.0","method":"%s","params":%s}"
#define ALINK_TOPIC_PROP_POST     "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
#define ALINK_TOPIC_PROP_POSTRSP  "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post_reply"
#define ALINK_TOPIC_PROP_SET      "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/service/property/set"
#define ALINK_METHOD_PROP_POST    "thing.event.property.post"
#define ALINK_TOPIC_DEV_INFO      "/ota/device/inform/" PRODUCT_KEY "/" DEVICE_NAME ""    
#define ALINK_VERSION_FROMA      "{"id": 123,"params": {"version": "%s"}}"
unsigned long lastMs = 0;WiFiClient   espClient;
PubSubClient mqttClient(espClient);Adafruit_BMP280 bme; // I2C
unsigned  bme280_status;
float RoomTemp;void init_wifi(const char *ssid, const char *password)      //连接WiFi
{de(WIFI_STA);WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED){Serial.println("WiFi does not connect, try again ...");delay(500);}Serial.println("Wifi is connected.");Serial.println("IP address: ");Serial.println(WiFi.localIP());
}void mqtt_callback(char *topic, byte *payload, unsigned int length) //mqtt回调函数
{Serial.print("Message arrived [");Serial.print(topic);Serial.print("] ");payload[length] = '';Serial.println((char *)payload);// /  json数据解析网站Serial.println("   ");Serial.println((char *)payload);Serial.println("   ");if (strstr(topic, ALINK_TOPIC_PROP_SET)){StaticJsonBuffer<100> jsonBuffer;JsonObject &root = jsonBuffer.parseObject(payload);int params_LightSwitch = root["params"]["LightSwitch"];if(params_LightSwitch==0){Serial.println("led off");digitalWrite(LED, HIGH); }else{Serial.println("led on");digitalWrite(LED, LOW); }if (!root.success()){Serial.println("parseObject() failed");return;}}
}
void mqtt_version_post()//主题的发布
{char param[512];char jsonBuf[1024];//sprintf(param, "{"MotionAlarmState":%d}", digitalRead(13));sprintf(param, "{"id": 123,"params": {"version": "%s"}}", DEV_VERSION);// sprintf(jsonBuf, ALINK_BODY_FORMAT, ALINK_METHOD_PROP_POST, param);Serial.println(param);mqttClient.publish(ALINK_TOPIC_DEV_INFO, param);
}
void mqtt_check_connect()//检查mqtt服务器是否连接
{while (!ted())//{while (connect_aliyun_mqtt(mqttClient, PRODUCT_KEY, DEVICE_NAME, DEVICE_SECRET)){Serial.println("MQTT connect succeed!");//client.subscribe(ALINK_TOPIC_PROP_POSTRSP);mqttClient.subscribe(ALINK_TOPIC_PROP_SET);Serial.println("subscribe done");mqtt_version_post();}}}void mqtt_interval_post()//向mqttt服务器发送数据
{char param[512];char jsonBuf[1024];RoomTemp = adTemperature();int inte1,frac1;inte1 = (int)(RoomTemp);frac1 = (RoomTemp - inte1) * 100;int Pressure&#adPressure();//sprintf(param, "{"MotionAlarmState":%d}", digitalRead(13));sprintf(param, "{"LightSwitch":%d,"CurrentTemperature":%d.%02d,"pressure":%d}", !digitalRead(LED),inte1,frac1,Pressure);sprintf(jsonBuf, ALINK_BODY_FORMAT, ALINK_METHOD_PROP_POST, param);Serial.println(jsonBuf);mqttClient.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
}void setup()
{pinMode(LED, OUTPUT);/* initialize serial for debugging */Serial.begin(115200);Serial.println("Demo Start");// Serial.println(F("BMP280 test"));//传感器初始化if (!bme.begin(0x76)) {  Serial.println("Could not find a valid BMP280 sensor, check wiring!");while (1);}//WiFi初始化init_wifi(WIFI_SSID, WIFI_PASSWD);//mqtt回调函数mqttClient.setCallback(mqtt_callback);}// the loop function runs over and over again forever
void loop()
{if (millis() - lastMs >= 5000)  //5S{lastMs = millis();mqtt_check_connect();/* Post */        mqtt_interval_post();}mqttClient.loop();

阿里云平台的配置

STEP1 创建产品

访问以上链接登录阿里云物联网平台，若没有账户，可使用支付宝扫码快速注册

服务器选择华东 2，左侧的设备管理中找到产品。单击进入产品管理界面。在产品管理界面的右上角找到蓝色的创建产品，新建产品如图。

单击完成后等待几秒，在产品列表中将看到新创建的智慧小屋，单击查看
进入产品详情界面。

在自定义功能里选择，添加自定义功能

注意标识符必须和代码里定义的变量相同否则会出现错误，主灯开关类型是布尔型

Ø STEP2 添加设备
在左侧导航栏中找到设备，单击进入设备管理页面，单击添加设备。添加
设备如图。