一、簡介

1.這期視頻向大家介紹如何使用CW32單片機(jī)通過ESP8266連接OneNET物聯(lián)網(wǎng)平臺，發(fā)送溫濕度數(shù)據(jù)到平臺，并接受平臺的云控制。

二、所需物料

2.本實(shí)驗(yàn)使用到了CW32-48F大學(xué)計(jì)劃開發(fā)板、DHT11溫濕度傳感器模塊、ESP8266WIFI模塊及Keil5開發(fā)環(huán)境。

CW32-48F大學(xué)計(jì)劃板

DHT11溫濕度傳感器模塊

ESP8266WIFI模塊

ESP8266WIFI模塊引腳分布

實(shí)物圖

3.接線：根據(jù)原理圖，把模塊連接到開發(fā)板上

（1）ESP8266WIFI模塊：

開發(fā)板上預(yù)留了該模塊接口，通過串口向ESP8266寫入指令。

（2）DHT11模塊：開發(fā)板上預(yù)留了該模塊接口

4.（1）MQTT協(xié)議介紹：

MQTT是一種輕量級的發(fā)布/訂閱消息傳輸協(xié)議，常用于物聯(lián)網(wǎng)領(lǐng)域。它的特點(diǎn)是簡化和減少了網(wǎng)絡(luò)流量，可以高效地進(jìn)行數(shù)據(jù)傳輸。在本次應(yīng)用中，我們將使用MQTT協(xié)議進(jìn)行數(shù)據(jù)上傳。

（2）OneNET代碼介紹：

在使用OneNet平臺時，我們需要使用TCP協(xié)議進(jìn)行連接。首先需要設(shè)置好TCP協(xié)議的相關(guān)參數(shù)，然后通過POST方法將溫濕度數(shù)據(jù)上傳到OneNet平臺中。在上傳數(shù)據(jù)時需要使用OneNet平臺提供的API接口進(jìn)行數(shù)據(jù)傳輸。

注： **#define ** PROID"XXX **" ** //xxx為產(chǎn)品ID

#define ACCESS_KEY "XXX **" ** //xxx為acess_key訪問密鑰

#define DEVICE_NAME ** "** XXX" //xxx為設(shè)備名稱

三、核心代碼

main.c

int main(void)
{  
 unsigned short timeCount = 0;  //發(fā)送間隔變量  
 unsigned char *dataPtr = NULL;

 Hardware_Init();        //初始化外圍硬件
  while(DHT11_Init())    //檢測DHT11
   Delay_ms(200);
 ESP8266_Init();          //初始化ESP8266
 UsartPrintf(USART_DEBUG, "Connect MQTTs Server...rn");
 while(ESP8266_SendCmd(ESP8266_ONENET_INFO, "CONNECT")) //ESP8266聯(lián)網(wǎng)
   Delay_ms(500);
 UsartPrintf(USART_DEBUG, "NET_OKrn");  
 while(OneNet_DevLink())      //接入OneNET
   Delay_ms(500);
 OneNET_Subscribe();     //訂閱消息傳輸，允許接受下發(fā)指令
 TFTShowString(0,0,"     OneNET     ");  //界面
 TFTShowString(1,0,"  智能物聯(lián)平臺  ");
 TFTShowString(3,0,"humidity:    %");
 TFTShowString(4,0,"temperature:  C");
 while(1)
 {
   if(++timeCount >= 50)                  
   {
     DHT11_Read_Data(&temperature,&humidity);  //讀取溫濕度值  
     TFTShowNumber(3,10,humidity);
     TFTShowNumber(4,12,temperature);
     UsartPrintf(USART_DEBUG,"TEMP:%d HUMI:%drn",temperature,humidity);
     UsartPrintf(USART_DEBUG, "OneNet_SendDatarn");
     OneNet_SendData();        //數(shù)據(jù)上傳
     timeCount = 0;
     ESP8266_Clear();    //清除緩存
   }  

   dataPtr = ESP8266_GetIPD(0); //接收OneNET平臺返回的數(shù)據(jù)
   if(dataPtr != NULL)
     OneNet_RevPro(dataPtr); //確認(rèn)返回?cái)?shù)據(jù)，執(zhí)行下發(fā)命令

   Delay_ms(10);
 }
}

Onenet.c:

#define PROID      "3OB4R7cKCw"       //產(chǎn)品ID（名稱）
#define ACCESS_KEY    "n7GptYNpf9U97zHTz2ltc1Pvy4GB+0MXsU1nKel9ixc="  //產(chǎn)品訪問密鑰
#define DEVICE_NAME    "111"     //設(shè)備ID（名稱）
void OneNet_RevPro(unsigned char *cmd)
{
 char *req_payload = NULL;
 char *cmdid_topic = NULL;
 unsigned short topic_len = 0;
 unsigned short req_len = 0;
 unsigned char qos = 0;
 static unsigned short pkt_id = 0;
 unsigned char type = 0;
 short result = 0;
 char *dataPtr = NULL;
 char numBuf[10];
 int num = 0;

 type = MQTT_UnPacketRecv(cmd);
 switch(type)
 {
   case MQTT_PKT_PUBLISH:                                //接收的Publish消息

     result = MQTT_UnPacketPublish(cmd, &cmdid_topic, &topic_len, &req_payload, &req_len, &qos, &pkt_id);
     if(result == 0)
     {
       char *data_ptr = NULL;
       UsartPrintf(USART_DEBUG, "topic: %s, topic_len: %d, payload: %s, payload_len: %drn",  cmdid_topic, topic_len, req_payload, req_len);
       data_ptr = strstr(cmdid_topic, "request/");                  //查找cmdid
       if(data_ptr)
       {
         char topic_buf[80], cmdid[40];

         data_ptr = strchr(data_ptr, '/');
         data_ptr++;

         memcpy(cmdid, data_ptr, 36);                      //復(fù)制cmdid
         cmdid[36] = 0;
         snprintf(topic_buf, sizeof(topic_buf), "$sys/%s/%s/cmd/response/%s",
                             PROID, DEVICE_NAME, cmdid);
         OneNET_Publish(topic_buf, "ojbk");                    //回復(fù)命令
       }
     }
     case MQTT_PKT_PUBACK:                            //發(fā)送Publish消息，平臺回復(fù)的Ack
         if(MQTT_UnPacketPublishAck(cmd) == 0)
       UsartPrintf(USART_DEBUG, "Tips:  MQTT Publish Send OKrn");
   break;
   case MQTT_PKT_SUBACK:                                //發(fā)送Subscribe消息的Ack

     if(MQTT_UnPacketSubscribe(cmd) == 0)
       UsartPrintf(USART_DEBUG, "Tips:  MQTT Subscribe OKrn");
     else
       UsartPrintf(USART_DEBUG, "Tips:  MQTT Subscribe Errrn");
   break;
   default:
     result = -1;
   break;
 }

 ESP8266_Clear();                  //清空緩存

 if(result == -1)
   return;

 dataPtr = strchr(req_payload, ':');          //搜索':'
 if(dataPtr != NULL)          //如果找到了
 {
   dataPtr++;
   while(*dataPtr >= '0' && *dataPtr <= '9')    //判斷是否是下發(fā)的命令控制數(shù)據(jù)
   {
     numBuf[num++] = *dataPtr++;
   }
   numBuf[num] = 0;
   num = atoi((const char *)numBuf);        //轉(zhuǎn)為數(shù)值形式
   if(strstr((char *)req_payload, "light"))    //搜索"light",判斷":"后面的數(shù)值進(jìn)行控制
   {
     if(num == 1)                //控制數(shù)據(jù)如果為1，代表開
     {
       UsartPrintf(USART_DEBUG, "接收到1rn");
       //開燈
       PA07_SETLOW();
       TFTShowString(5,0,"light: ON ");
     }
     else if(num == 0)              //控制數(shù)據(jù)如果為0，代表關(guān)
     {
       UsartPrintf(USART_DEBUG, "接收到0rn");
       //關(guān)燈
       PA07_SETHIGH();
       TFTShowString(5,0,"light: OFF");
     }
   }
 }
 if(type == MQTT_PKT_CMD || type == MQTT_PKT_PUBLISH)
 {
   MQTT_FreeBuffer(cmdid_topic);
   MQTT_FreeBuffer(req_payload);
 }
}

附件：基于CW32的物聯(lián)網(wǎng)應(yīng)用源碼.zip
審核編輯：湯梓紅