【NB-IoT 物联网开发板 TinkerNode】户外水质监测项目

#define SensorPin 0            //pH meter Analog output to Arduino Analog Input 0
#define Offset 0.00            //deviation compensate
#define LED 13
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth  40    //times of collection
int pHArray[ArrayLenth];   //Store the average value of the sensor feedback
int pHArrayIndex=0;   
void setup(void)
{
  pinMode(LED,OUTPUT);  
  Serial.begin(9600);  
  Serial.println("pH meter experiment!");    //Test the serial monitor
}
void loop(void)
{
  static unsigned long samplingTime = millis();
  static unsigned long printTime = millis();
  static float pHValue,voltage;
  if(millis()-samplingTime > samplingInterval)
  {
      pHArray[pHArrayIndex++]=analogRead(SensorPin);
      if(pHArrayIndex==ArrayLenth)pHArrayIndex=0;
      voltage = avergearray(pHArray, ArrayLenth)*5.0/1024;
      pHValue = 3.5*voltage+Offset;
      samplingTime=millis();
  }
  if(millis() - printTime > printInterval)   //Every 800 milliseconds, print a numerical, convert the state of the LED indicator
  {
        Serial.print("Voltage:");
        Serial.print(voltage,2);
        Serial.print("    pH value: ");
        Serial.println(pHValue,2);
        digitalWrite(LED,digitalRead(LED)^1);
        printTime=millis();
  }
}
double avergearray(int* arr, int number){
  int i;
  int max,min;
  double avg;
  long amount=0;
  if(number<=0){
    Serial.println("Error number for the array to avraging!/n");
    return 0;
  }
  if(number<5){   //less than 5, calculated directly statistics
    for(i=0;i<number;i++){
      amount+=arr;
    }
    avg = amount/number;
    return avg;
  }else{
    if(arr[0]<arr[1]){
      min = arr[0];max=arr[1];
    }
    else{
      min=arr[1];max=arr[0];
    }
    for(i=2;i<number;i++){
      if(arr<min){
        amount+=min;        //arr<min
        min=arr;
      }else {
        if(arr>max){
          amount+=max;    //arr>max
          max=arr;
        }else{
          amount+=arr; //min<=arr<=max
        }
      }//if
    }//for
    avg = (double)amount/(number-2);
  }//if
  return avg;
}
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//配置证书信息
String ProductKey = "Your_Product_Key";
String ClientId = "12345";
String DeviceName = "Your_Device_Name";
String DeviceSecret = "Your_Device_Secret";
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//配置产品标识符
String TempIdentifier = "Your_Temp_Identifier";
String PHIdentifier = "Your_ph_Identifier";
String TDSIdentifier = "Your_TDS_Identifier";
String GaugeIdentifier = "Your_batGauge_Identifier";
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//需要发布和订阅的TOPIC
const char * subTopic = "Your_sub_Topic";//****set
const char * pubTopic = "Your_pub_Topic";//******post
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#define Offset 0.00            //deviation compensate
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//#define TIME_TO_SLEEP_SECOND  10         /* Time ESP32 will go to sleep (in seconds) */
#define TIME_TO_SLEEP_MINUTE  5         /* Time ESP32 will go to sleep (in mimutes) */
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