Temperature compensation missing in code

[erdinguma]

Any plans to add temperature compensation?

[erdinguma]

There are functions that call the temperature reading but the formula doesn't actually use the temperature:

float DFRobot_PH::readPH(float voltage, float temperature)
{
float slope = (7.0-4.0)/((this->_neutralVoltage-1500.0)/3.0 - (this->_acidVoltage-1500.0)/3.0); // two point: (_neutralVoltage,7.0),(_acidVoltage,4.0)
float intercept = 7.0 - slope*(this->_neutralVoltage-1500.0)/3.0;
//Serial.print("slope:");
//Serial.print(slope);
//Serial.print(",intercept:");
//Serial.println(intercept);
this->_phValue = slope*(voltage-1500.0)/3.0+intercept; //y = k*x + b
return _phValue;
}

[jpagliaccio]

When will you be adding temperature compensation? On your forum NeloKin says .. "soon". On the wiki "In order to guarantee precision, a temperature sensor such as DS18B20 is needed, to execute automatic temperature compensation."

https://www.dfrobot.com/forum/topic/315463

2023-02-24 15:40:01
For pH sensor like Gravity: Analog Industrial pH Sensor / Meter Pro Kit V2(SKU:SEN0169-V2), I have checked with the product manager, we do not have temperature calibration now. However, we will add this function soon.