簡介
本文章使用NodeMCU(ESP8266)開發板和SHTC3溫溼度傳感器接入阿里雲物聯網(IoT)平臺,並上傳讀取到的溫溼度數據。每秒讀取一次溫溼度數據,每30秒上傳一次30秒內的溫溼度的平均值。可以自己修改一下程序使用其他溫溼度傳感器。本文程序使用Arduino IDE開發。
DHT11和DHT22溫溼度傳感器數據讀取的程序:https://blog.zeruns.tech/archives/527.html
ESP8266開發環境搭建教程:https://blog.zeruns.tech/archives/526.html
SHTC3的SDA引腳接NodeMCU的D5引腳,SCL引腳接NodeMCU的D6引腳。
設置物聯網平臺
首先註冊阿里雲賬號並開通物聯網平臺:https://www.aliyun.com/product/iot?source=5176.11533457&userCode=jdjc69nf&type=copy
然後打開物聯網平臺的控制檯:https://iot.console.aliyun.com/product
接著按照圖片提示創建產品
按照圖片提示添加設備
程序源碼
需先安裝PubSubClient
、ArduinoJson
、SparkFun SHTC3
這三個庫。
然後按照下面的教程修改PubSubClient.h
按照代碼中文字提示修改參數即可。
#include <ESP8266WiFi.h>
/* 依賴 PubSubClient 2.4.0 */
#include <PubSubClient.h>
/* 依賴 ArduinoJson 5.13.4 */
#include <ArduinoJson.h>
#include <SparkFun_SHTC3.h>
/* 連接您的WIFI SSID和密碼 */
#define WIFI_SSID "路由器SSID"
#define WIFI_PASSWD "密碼"
/* 設備的三元組信息*/
#define PRODUCT_KEY "設備PRODUCT_KEY"
#define DEVICE_NAME "替換DEVICE_NAME"
#define DEVICE_SECRET "替換DEVICE_SECRET"
#define REGION_ID "cn-shanghai"
/* 線上環境域名和端口號,不需要改 */
#define MQTT_SERVER PRODUCT_KEY ".iot-as-mqtt." REGION_ID ".aliyuncs.com"
#define MQTT_PORT 1883
#define MQTT_USRNAME DEVICE_NAME "&" PRODUCT_KEY
#define CLIENT_ID "ESP8266|securemode=3,timestamp=1234567890,signmethod=hmacsha1|"
// 算法工具: http://iot-face.oss-cn-shanghai.aliyuncs.com/tools.htm 進行加密生成password
// password教程 https://www.yuque.com/cloud-dev/iot-tech/mebm5g
#define MQTT_PASSWD "參考上面password教程,算法工具生成,如果上面的教程看不懂就看文章下面"
#define ALINK_BODY_FORMAT "{\"id\":\"ESP8266\",\"version\":\"1.0\",\"method\":\"thing.event.property.post\",\"params\":%s}"
#define ALINK_TOPIC_PROP_POST "/sys/" PRODUCT_KEY "/" DEVICE_NAME "/thing/event/property/post"
unsigned long lastMs = 0;
float RH,T,RH_sum,T_sum;
unsigned char count=0;
WiFiClient espClient;
PubSubClient client(espClient);
SHTC3 mySHTC3;
void callback(char *topic, byte *payload, unsigned int length)
{
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
payload[length] = '\0';
Serial.println((char *)payload);
}
void wifiInit()
{
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWD); //連接WiFi
while (WiFi.status() != WL_CONNECTED)
{
delay(1000);
Serial.println("WiFi not Connect");
}
Serial.println("Connected to AP");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.print("espClient [");
client.setServer(MQTT_SERVER, MQTT_PORT); /* 連接WiFi之後,連接MQTT服務器 */
client.setCallback(callback);
}
void mqttCheckConnect()
{
while (!client.connected())
{
Serial.println("Connecting to MQTT Server ...");
if (client.connect(CLIENT_ID, MQTT_USRNAME, MQTT_PASSWD))
{
Serial.println("MQTT Connected!");
}
else
{
Serial.print("MQTT Connect err:");
Serial.println(client.state());
delay(5000);
}
}
}
void mqttIntervalPost()
{
char param[32];
char jsonBuf[128];
sprintf(param, "{\"CurrentTemperature\":%f}",T_sum/count);
sprintf(jsonBuf, ALINK_BODY_FORMAT, param);
Serial.println(jsonBuf);
boolean d = client.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
if(d){
Serial.println("publish Temperature success");
}else{
Serial.println("publish Temperature fail");
}
//https://blog.zeruns.tech
sprintf(param, "{\"CurrentHumidity\":%f}",RH_sum/count);
sprintf(jsonBuf, ALINK_BODY_FORMAT, param);
Serial.println(jsonBuf);
d = client.publish(ALINK_TOPIC_PROP_POST, jsonBuf);
if(d){
Serial.println("publish Humidity success");
}else{
Serial.println("publish Humidity fail");
}
}
void errorDecoder(SHTC3_Status_TypeDef message) // The errorDecoder function prints "SHTC3_Status_TypeDef" resultsin a human-friendly way
{
switch(message)
{
case SHTC3_Status_Nominal : Serial.print("Nominal"); break;
case SHTC3_Status_Error : Serial.print("Error"); break;
case SHTC3_Status_CRC_Fail : Serial.print("CRC Fail"); break;
default : Serial.print("Unknown return code"); break;
}
}
//https://blog.zeruns.tech
void setup()
{
/* initialize serial for debugging */
Serial.begin(115200);
Serial.println("Demo Start");
wifiInit();
Wire.begin(D5,D6); //初始化Wire(IIC)庫
unsigned char i=0;
errorDecoder(mySHTC3.begin());
}
// the loop function runs over and over again forever
void loop()
{
delay(1000); //延時1000毫秒
SHTC3_Status_TypeDef result = mySHTC3.update();
if(mySHTC3.lastStatus == SHTC3_Status_Nominal) //判斷SHTC3狀態是否正常
{
RH = mySHTC3.toPercent(); //讀取溼度數據
T = mySHTC3.toDegC(); //讀取溫度數據
RH_sum+=RH;
T_sum+=T;
count+=1;
}else{
Serial.print("Update failed, error: ");
errorDecoder(mySHTC3.lastStatus); //輸出錯誤原因
Serial.println();
}
Serial.print("Humidity:"); //向串口打印 Humidity:
Serial.print(RH); //向串口打印溼度數據
Serial.print("%");
Serial.print(" Temperature:");
Serial.print(T); //向串口打印溫度數據
Serial.println("C");
Serial.println("https://blog.zeruns.tech");
if (millis() - lastMs >= 30000)
{
lastMs = millis();
mqttCheckConnect();
/* 上報 */
mqttIntervalPost();
count=0;
RH_sum=0;
T_sum=0;
}
client.loop();
}
修改PubSubClient.h
找到PubSubClient.h文件,將#define MQTT_MAX_PACKET_SIZE
後的數字改為1024,將#define MQTT_KEEPALIVE
後的數字改為60
password生成教程
password生成工具:http://iot-face.oss-cn-shanghai.aliyuncs.com/tools.htm
假設你的設備三元組數據如下
設備三元組
ProductKey = a14Xib5kdYd
DeviceName = ESP8266
DeviceSecret = oLyaKqVxtRvjH284LdhqVgVUx1UPy6zq
建立MQTT連接時參數,這個信息是代碼中的CLIENT_ID,可以自己設置
clientId = ESP8266
timestamp = 1234567890
signmethod = hmacsha1
然後根據這些信息生成password的content
clientIdESP8266deviceNameESP8266productKeya15ptdU1zhPtimestamp1234567890
明文輸入content,祕鑰輸入deviceSecret,點擊hmac-sha1就可以生成password
效果圖
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