sáng tạo với cảm biến TDS Sensor

CODE THAM KHẢO

#define TdsSensorPin A1

#define VREF 5.0 // analog reference voltage(Volt) of the ADC

#define SCOUNT 30 // sum of sample point

int analogBuffer[SCOUNT]; // store the analog value in the array, read from ADC

int analogBufferTemp[SCOUNT];

int analogBufferIndex = 0,copyIndex = 0;

float averageVoltage = 0,tdsValue = 0,temperature = 25;

void setup()

{

Serial.begin(115200);

pinMode(TdsSensorPin,INPUT);

}

void loop()

{

static unsigned long analogSampleTimepoint = millis();

if(millis()-analogSampleTimepoint > 40U) //every 40 milliseconds,read the analog value from the ADC

{

analogSampleTimepoint = millis();

analogBuffer[analogBufferIndex] = analogRead(TdsSensorPin); //read the analog value and store into the buffer

analogBufferIndex++;

if(analogBufferIndex == SCOUNT)

analogBufferIndex = 0;

}

static unsigned long printTimepoint = millis();

if(millis()-printTimepoint > 800U)

{

printTimepoint = millis();

for(copyIndex=0;copyIndex<SCOUNT;copyIndex++)

analogBufferTemp[copyIndex]= analogBuffer[copyIndex];

averageVoltage = getMedianNum(analogBufferTemp,SCOUNT) * (float)VREF / 1024.0; // read the analog value more stable by the median filtering algorithm, and convert to voltage value

float compensationCoefficient=1.0+0.02*(temperature-25.0); //temperature compensation formula: fFinalResult(25^C) = fFinalResult(current)/(1.0+0.02*(fTP-25.0));

float compensationVolatge=averageVoltage/compensationCoefficient; //temperature compensation

tdsValue=(133.42*compensationVolatge*compensationVolatge*compensationVolatge - 255.86*compensationVolatge*compensationVolatge + 857.39*compensationVolatge)*0.5;

Serial.print("TDS Value:");

Serial.print(tdsValue,0);

Serial.println("ppm");

}

}

int getMedianNum(int bArray[], int iFilterLen)

{

int bTab[iFilterLen];

for (byte i = 0; i<iFilterLen; i++)

bTab[i] = bArray[i];

int i, j, bTemp;

for (j = 0; j < iFilterLen - 1; j++)

{

for (i = 0; i < iFilterLen - j - 1; i++)

{

if (bTab[i] > bTab[i + 1])

{

bTemp = bTab[i];

bTab[i] = bTab[i + 1];

bTab[i + 1] = bTemp;

}

}

}

if ((iFilterLen & 1) > 0)

bTemp = bTab[(iFilterLen - 1) / 2];

else

bTemp = (bTab[iFilterLen / 2] + bTab[iFilterLen / 2 - 1]) / 2;

return bTemp;

}

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