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eBay Note: TDS probes cannot be used in water above 55 °C. The TDS probe should not be placed too close to the edge of the container, as it will affect the display. The head and lead of the TDS probe are waterproof and can be immersed in water, but the connection interface and the signal adapter board are not waterproof. Please pay attention to use. Product Features: 1. Wide voltage operation: 3.3~5.5V 2. 0~2.3V analog signal output, compatible with 5V, 3.3V two control systems 3. The excitation source is an AC signal, effectively preventing probe polarization 4. Waterproof probe for long-term immersion in water 5. compatible, easy to connect, plug and play, no soldering required Technical specifications: Signal adapter board: Input voltage: 3.3~5.5V Output signal: 0~2.3V Working current: 3~6mA TDS measurement range: 0~1000ppm TDS measurement accuracy: ±10% F.S. (25°C) Size: 42*32mm Module interface: XH2.54-3P Electrode interface: XH2.54-2P TDS probe: Number of probes: 2 Overall length: 83cm Connection interface: XH2.54-2P color: White Other: Waterproof probe Package includes: 1 x TDS signal adapter board 1 x Waterproof TDS probe 1 x Analog sensor line source code: #define TdsSensorPin A1 #define kValue 1.8 //kValue = value of calibrator TDS / measurement to get TDS #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 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*kValue; //convert voltage value to tds value //Serial.print(“voltage:”); //Serial.print(averageVoltage,2); //Serial.print(“V “); 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 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; } Contact us Return Policy Feedback Contact us For anything problem about product, price, shipping or order status, pleasecontact us via eBay message.Just contact us using the “Ask the seller a question” link on eBay. We expect positive feedback and 5 scores DSR from you. Return Policy We believe our items are so outstanding. We are convinced you will be happy with your Purchase. If you do not satisfy with our items. Please simply return to us within 30 Days in original condition. Just pay for the returned postage. Then we can issue full refund to you after the returned item arrived at our warehouse. Please include your eBay ID and item number with any email requests. Feedback * When you satisfied with our product and services please leave us positive feedback. * If you have got the package, please confirm “Delivery on time” For us. * If a problem occurs, contact us immediately with any email request. * Just contact us using the ” Ask the seller a question” link on eBay. Your Satisfaction is our Priority. Our goal is to make all our customers as happy as possible while shopping with us.

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