/**********************************************
* INA219 library example
* 9 January 2016 by Flavius Bindea
*
* this code is public domain.
**********************************************/


#include <Wire.h>
#include <INA219.h>

#define SHUNT_MAX_V 0.04  /* Rated max for our shunt is 75mv for 50 A current: 
                             we will mesure only up to 20A so max is about 75mV*20/50 lets put some more*/
#define BUS_MAX_V   16.0  /* with 12v lead acid battery this should be enough*/
#define MAX_CURRENT 20    /* In our case this is enaugh even shunt is capable to 50 A*/
#define SHUNT_R   0.015   /* Shunt resistor in ohm */

INA219 monitor;

void setup()
{
  Serial.begin(57600);
  monitor.begin();
  // setting up our configuration
  // default values are RANGE_32V, GAIN_8_320MV, ADC_12BIT, ADC_12BIT, CONT_SH_BUS
  monitor.configure(INA219::RANGE_16V, INA219::GAIN_2_80MV, INA219::ADC_64SAMP, INA219::ADC_64SAMP, INA219::CONT_SH_BUS);
  
  // calibrate with our values
  monitor.calibrate(SHUNT_R, SHUNT_MAX_V, BUS_MAX_V, MAX_CURRENT);
}

void loop()
{
  Serial.println("******************");
  
  Serial.print("raw shunt voltage: ");
  Serial.println(monitor.shuntVoltageRaw());
  
  Serial.print("raw bus voltage:   ");
  Serial.println(monitor.busVoltageRaw());
  
  Serial.println("--");
  
  Serial.print("shunt voltage: ");
  Serial.print(monitor.shuntVoltage() * 1000, 4);
  Serial.println(" mV");
  
  Serial.print("shunt current: ");
  Serial.print(monitor.shuntCurrent() * 1000, 4);
  Serial.println(" mA");
  
  Serial.print("bus voltage:   ");
  Serial.print(monitor.busVoltage(), 4);
  Serial.println(" V");
  
  Serial.print("bus power:     ");
  Serial.print(monitor.busPower() * 1000, 4);
  Serial.println(" mW");
  
  Serial.println(" ");
  Serial.println(" ");
  
  delay(1000);
}