Analog TDS Sensor FAQ【SEN0244】

Q1:Does this sensor have a temperature sensor? How to make the temperature compensation?

A1:This TDS probe has no temperature sensor, but the temperature compensation algorithm is reserved in the sample code. The temperature variable in the sample code will default to 25 °C without a temperature sensor. You can add a waterproof temperature sensor to read the temperature,then update the temperature variable, to make automatic temperature compensation.

Q2:Is it possible to measure ppm above 1000?

A2:Sorry, the recognition range of this sensor is 0~1000ppm. If the actual TDS value in water exceeds 1000, the sensor cannot recognize it and can only output the highest value of 1000ppm.

Q3:Can the sensor be immersed in water for a long time to measure?

A3:Yes, the sensor can be immersed in water for long periods of time.

Q4:My sensor keeps outputting NAN or OVF, what should I do?

A4:Please upload the code below to clear the Epprom cache, then re-upload the Wiki example code to see if the output returns to normal.

#include <EEPROM.h>
#define TDSADDR 0x08
void setup()
{
 Serial.begin(115200);
 for(int i = 0;i < 8; i++ )
 {
    EEPROM.write(TDSADDR+i, 0xFF);// write defaullt value to the EEPROM
    delay(10);
 }
}
void loop()
{
 static int a = 0, value = 0;
 value = EEPROM.read(TDSADDR+a);
 Serial.print(TDSADDR+a,HEX);
 Serial.print(":");
 Serial.print(value);// print the new value of EEPROM block used by TDS meter. The correct is 255. 
 Serial.println();
 delay(10);
 a = a + 1;
 if (a == 8)
   while(1);
}

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