I've seen an adaptation from the Gravity: Analog pH Sensor/Meter Kit V2 (SEN0161-V2) done by Greenponik here https://github.com/GreenPonik/DFRobot_ESP_PH_WITH_ADC_BY_GREENPONIK.

The only difference I see, besides some predefined constants to make calibration more convenient, is the way Greenponik says they get the “voltage”, taken from https://github.com/GreenPonik/DFRobot_ESP_PH_WITH_ADC_BY_GREENPONIK/blob/master/example/read_ph/read_ph.ino:

```cpp

voltage = ads.readADC_SingleEnded(1) / 10; // read the voltage

```

This is not actual voltage value that the board is under, just a seemingly random type of offset applied to the raw ADS1115 read. Output of board Electrical Conductivity Sensor PRO K 1 SKU:SEN0451 is max out at 3v, as per its specifications, so using 3.3v as input to ADS1115 with GAIN_ONE +4.096v should be good.

Having this into account. Is there any more elegant way to adapt the Electrical Conductivity Sensor PRO K 1 SKU:SEN0451 to work with esp32+ADS1115 besides figuring out some offset that makes real world values match with measured ones? I'm using https://github.com/cdjq/DFRobot_ECPRO library.

I feel that having adapted values of this constants is where the solution lies (https://github.com/cdjq/DFRobot_ECPRO/blob/master/DFRobot_ECPRO.h):
```cpp

#define RES2 820.0
#define ECREF 200.0
#define GDIFF (30/1.8) ← Maybe here..
#define VR0 0.223
#define G0 2 ← Or here..
#define I (1.24 / 10000) ← Or here ?
```

Please, if anyone knows the adaptation key, please share. Thank you.