EnviroDIY

2020-05-12 at 12:06 PM #14156

Participant

Thanks Chuck for getting my Sensorex RTD voltage divider output converted to °C. I plan to leave the EC as the raw value from the AtlasScientific EZO circuit. Attached is the code addition to DRWI_CitSci.ino to get the Sensorex probe data published to MonMW:

//==================================================
//   Atlas Scientific EZO
//=============================================
#include <sensors/AtlasScientificEC.h>
//create EZO Object
AtlasScientificEC atlasEC(22, 0x64, 5);

// ==========================================================================
//    calculate temperature from RTD voltage divider
// ==========================================================================
#include <sensors/ExternalVoltage.h>

const int8_t ADSPower = sensorPowerPin;  // Pin to switch power on and off (-1 if unconnected)
const int8_t ADSChannel = 2;  // The ADS channel of interest
const float dividerGain =1;  //  Default 1/gain for grove voltage divider is 10x
// const uint8_t ADSi2c_addr = 0x48;  // The I2C address of the ADS1115 ADC
const uint8_t VoltReadsToAvg = 1;  // Only read one sample
//float testVar = 2.123;

// Create an External Voltage sensor object
ExternalVoltage extvolt(ADSPower, ADSChannel, dividerGain, 0x48, VoltReadsToAvg);
ExternalVoltage_Volt sensorVoltage(&extvolt);

// Linear correction coeficients of RTD with 10K ohm voltage divider
const float TemperatureMultipiler = -30.141;  //m, Sensorex RTD
const float TemperatureConstant = 75.359;     //b, Sensorex RTD
// Create a function to calculate centigrade from the voltage
float calcTemp(void)
{
    float voltage = sensorVoltage.getValue(true);
    return voltage = TemperatureMultipiler * voltage + TemperatureConstant;
}


// ==========================================================================
//    Creating the Variable Array[s] and Filling with Variable Objects
// ==========================================================================

Variable *variableList[] = {
  new MaximDS3231_Temp(&ds3231),
  new ProcessorStats_Battery(&mcuBoard),
  new Modem_RSSI(&modem),
  new Variable(calcTemp, 1,
              "temperature", "Degree Celsius",
              "waterTemp",""),
  new AtlasScientificEC_Cond(&atlasEC),
      //  new Modem_SignalPercent(&modem),
};

//==================================================

// Atlas Scientific EZO

//=============================================

#include <sensors/AtlasScientificEC.h>

//create EZO Object

AtlasScientificEC atlasEC(22, 0x64, 5);

// ==========================================================================

// calculate temperature from RTD voltage divider

// ==========================================================================

#include <sensors/ExternalVoltage.h>

const int8_t ADSPower = sensorPowerPin; // Pin to switch power on and off (-1 if unconnected)

const int8_t ADSChannel = 2; // The ADS channel of interest

const float dividerGain =1; // Default 1/gain for grove voltage divider is 10x

// const uint8_t ADSi2c_addr = 0x48; // The I2C address of the ADS1115 ADC

const uint8_t VoltReadsToAvg = 1; // Only read one sample

//float testVar = 2.123;

// Create an External Voltage sensor object

ExternalVoltage extvolt(ADSPower, ADSChannel, dividerGain, 0x48, VoltReadsToAvg);

ExternalVoltage_Volt sensorVoltage(&extvolt);

// Linear correction coeficients of RTD with 10K ohm voltage divider

const float TemperatureMultipiler = -30.141; //m, Sensorex RTD

const float TemperatureConstant = 75.359; //b, Sensorex RTD

// Create a function to calculate centigrade from the voltage

float calcTemp(void)

{

float voltage = sensorVoltage.getValue(true);

return voltage = TemperatureMultipiler * voltage + TemperatureConstant;

}

// ==========================================================================

// Creating the Variable Array[s] and Filling with Variable Objects

// ==========================================================================

Variable *variableList[] = {

new MaximDS3231_Temp(&ds3231),

new ProcessorStats_Battery(&mcuBoard),

new Modem_RSSI(&modem),

new Variable(calcTemp, 1,

"temperature", "Degree Celsius",

"waterTemp",""),

new AtlasScientificEC_Cond(&atlasEC),

// new Modem_SignalPercent(&modem),

};