接上一个项目
【DFRobot
tinkerNode NB-IoT 物联网
开发板免费试用】+第一个项目
在阿里云平台上
IoT初学者开发套件中
案例4 温湿度监测
在Arduino IDE中
点击文件->示例->DFRobot_IoTAliyun->Aliyun->SmartDHT11，如下图所示。
增加
#define BEDROOD_LIGHT D4
上次项目的灯控制。
与上次一样在阿里云平台上创建设备，根据下载Excel文件更改相应配置
选择正确板和com端口，验证发现无"DFRobot_DHT11.h"文件，
在https://wiki.dfrobot.com.cn/_SKU_DFR0067_DHT11%E6%95%B0%E5%AD%97%E6%B8%A9%E6%B9%BF%E5%BA%A6%E4%BC%A0%E6%84%9F%E5%99%A8V2网上可下载201709141149593byvtx.zip文件中包含DHT11文件包
把解包文件拷贝到ArduinolibrariesDHT11文件夹中
变更后的配置：
#include
#include
#include
#include "DFRobot_Iot.h"
#include "dht11.h"
#define DHT11_PIN D2
#define BEDROOD_LIGHT D4
/*Set WIFI name and password*/
const char * WIFI_SSID = "911";//"WIFI_SSID";
const char * WIFI_PASSWORD = "31698639";//"WIFI_PASSWORD";
/*Configure device certificate information*/
String ProductKey = "a1DP0w8Z8i";//you_Product_Key";
String ClientId = "12345";
String DeviceName = "rxgcbeEhora43tMXaFMR";//you_Device_Name";
String DeviceSecret = "e7c95a299b051eb6675337e61d416e86";//you_Device_Secret";
/*Configure the domain name and port number*/
String ALIYUN_SERVER = "iot-as-mqtt.cn-shanghai.aliyuncs.com";
uint16_t PORT = 1883;
/*Product identifier that needs to be operated*/
/*需要操作的产品标识符(温度和湿度两个标识符)*/
String TempIdentifier = "Temperature";
String HumiIdentifier = "Humidity";
String ledIdentifier = "LED_S";
/*TOPIC that need to be published and subscribed*/
const char * subTopic = "/sys/a1DP0w8Z8i/rxgcbeEhora43tMXaFMR/thing/service/property/set";//you_sub_Topic";//****set
const char * pubTopic = "/sys/a1DP0w8Z8i/rxgcbeEhora43tMXaFMR/thing/event/property/post";//******post
//增加原来的灯控制set部分
StaticJsonBuffer<300> jsonBuffer;
JsonObject& root = jsonBuffer.parseObject((const char *)payload);
if(!root.success()){
Serial.println("parseObject() failed");
return;
}
uint8_t SocketStatus1,ledStatus ;//定义局部变量
const char* ledtval = root["params"][ledIdentifier];//判断Identifier是否存在，不存在返回NULL
if( ledtval != NULL )
{
// Serial.println("------------");
ledStatus = root["params"][ledIdentifier];
Serial.print("ledStatus=");
Serial.print(ledStatus);
if(ledStatus == 1){
/*打开灯*/
openLight();
}else{
/*关掉灯*/
closeLight();
}
}}
String tempMsegled = "{"id":"+ClientId+","params":{""+ledIdentifier+"":"+(String)ledStatus+"},"method":"thing.event.property.post"}";
char ledsendMseg[tempMsegled.length()];
strcpy(ledsendMseg,tempMsegled.c_str());
client.publish(pubTopic,ledsendMseg);
pinMode(BEDROOD_LIGHT,OUTPUT);
pinMode(DHT11_PIN,INPUT);
loop()中增加
if(DHT.temperature > 31){
openLight();
}else
closeLight();
作为超过31度指示并执行的程序。
将原来程序半分钟一次变为1分钟（由60变为120）
程序如下：
DFRobot_Iot myIot;
WiFiClient espClient;
PubSubClient client(espClient);
dht11 DHT;//DFRobot_DHT11 DHT;
static void openLight(){//led控制
digitalWrite(BEDROOD_LIGHT, HIGH);
}
static void closeLight(){//led控制
digitalWrite(BEDROOD_LIGHT, LOW);
}
void connectWiFi(){
Serial.print("Connecting to ");
Serial.println(WIFI_SSID);
WiFi.begin(WIFI_SSID,WIFI_PASSWORD);
while(WiFi.status() != WL_CONNECTED){
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.print("IP Adderss: ");
Serial.println(WiFi.localIP());
}
void callback(char * topic, byte * payload, unsigned int len){
Serial.print("Recevice [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < len; i++){
Serial.print((char)payload);
}
Serial.println();
//增加原来的灯控制set部分
StaticJsonBuffer<300> jsonBuffer;
JsonObject& root = jsonBuffer.parseObject((const char *)payload);
if(!root.success()){
Serial.println("parseObject() failed");
return;
}
uint8_t SocketStatus1,ledStatus ;//定义局部变量
const char* ledtval = root["params"][ledIdentifier];//判断Identifier是否存在，不存在返回NULL
if( ledtval != NULL )
{
// Serial.println("------------");
ledStatus = root["params"][ledIdentifier];
Serial.print("ledStatus=");
Serial.print(ledStatus);
if(ledStatus == 1){
/*打开灯*/
openLight();
}else{
/*关掉灯*/
closeLight();
}
}
String tempMsegled = "{"id":"+ClientId+","params":{""+ledIdentifier+"":"+(String)ledStatus+"},"method":"thing.event.property.post"}";
char ledsendMseg[tempMsegled.length()];
strcpy(ledsendMseg,tempMsegled.c_str());
client.publish(pubTopic,ledsendMseg);
}
void ConnectCloud(){
while(!client.connected()){
Serial.print("Attempting MQTT connection...");
/*A device connected to the cloud platform based on an automatically calculated username and password*/
if(client.connect(myIot._clientId,myIot._username,myIot._password)){
Serial.println("connected");
client.subscribe(subTopic);
}else{
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void setup(){
Serial.begin(115200);
pinMode(BEDROOD_LIGHT,OUTPUT);
pinMode(DHT11_PIN,INPUT);
closeLight();
/*Connect to WIFI*/
connectWiFi();
/*Initialize the configuration of Aliyun*/
/*初始化Alinyun的配置，可自动计算用户名和密码*/
myIot.init(ALIYUN_SERVER,ProductKey,ClientId,DeviceName,DeviceSecret);
client.setServer(myIot._mqttServer,PORT);
/*Set the callback function to execute the callback function when receiving the subscription information*/
/*设置回调函数，当收到订阅信息时会执行回调函数*/
client.setCallback(callback);
/*Connect to the cloud platform*/
/*连接到Aliyun*/
ConnectCloud();
}
uint8_t tempTime = 0;
void loop(){
if(!client.connected()){
ConnectCloud();
}
/*One minute publish temperature and humidity information*/
/*一分钟上报次温湿度信息*/
if(tempTime > 120){
tempTime = 0;
DHT.read(DHT11_PIN);
Serial.print("DHT.temperature=");
Serial.println(DHT.temperature);
Serial.print("DHT.humidity");
Serial.println(DHT.humidity);
client.publish(pubTopic,("{"id":"+ClientId+","params":{""+TempIdentifier+"":"+DHT.temperature+",""+HumiIdentifier+"":"+DHT.humidity+"},"method":"thing.event.property.post"}").c_str());
}else{
tempTime++;
delay(500);
}
if(DHT.temperature > 31){
openLight();
}else
closeLight();
client.loop();
}
选择正确板和com端口，验证后上传
运行下，在MQTT连接完成后，在https://studio.iot.aliyun.com/可以在设备管理界面看到设备显示在线，
后进入点
在线调试
灯没问题后
去阿里云平台物联网平台
web编辑，编辑案例4 温湿度监测
设置好后温度显示正常，但湿度无变化为0，设备正常上传数据
阿里云平台服务不太好
但是5天后在预览时就都正常了，不知为什么。
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