current.ino

#include <Wire.h>
#include <Adafruit_INA219.h>

Adafruit_INA219 ina219;


void setupCurrent(void) 
{
  
  // Initialize the INA219.
  // By default the initialization will use the largest range (32V, 2A).  However
  // you can call a setCalibration function to change this range (see comments).
  ina219.begin();
  // To use a slightly lower 32V, 1A range (higher precision on amps):
  //ina219.setCalibration_32V_1A();
  // Or to use a lower 16V, 400mA range (higher precision on volts and amps):
  //ina219.setCalibration_16V_400mA();

  //Serial.println("Measuring voltage and current with INA219 ...");

  for( int i = 0; i < U8_Width; i ++ )
      currentLog[i] = 100;
}

void loopCurrent(void) 
{
  float shuntvoltage = 0;
  float busvoltage = 0;
 

  shuntvoltage = ina219.getShuntVoltage_mV();
  busvoltage = ina219.getBusVoltage_V();
  current_mA = ina219.getCurrent_mA();
  loadvoltage = busvoltage + (shuntvoltage / 1000);

  smoothedCurrent_mA = (1.0-currentSmoother) * smoothedCurrent_mA + currentSmoother * current_mA;

  long now = millis();
  if( now - lastCurrentLog  > currentLogInterval)
  {
    // shift array down
    for( int i = 0; i < U8_Width - 1; i ++ )
      currentLog[i] = currentLog[i+1];

    // add new entry
    currentLog[U8_Width - 1] = smoothedCurrent_mA;  
    lastCurrentLog = now;
    setCurrentGraphDirty();
    numCurrentSamples++;
  }

}