Energy meter on an Arduino Uno

// Energy meter: an INA228 on a 12 V load adds up the energy and the charge
// that flow through its shunt, the way a battery monitor counts what is
// left, and an OPT3001 reads the light falling on the solar panel that
// would charge the battery.
//
//   INA228    SDA -> SDA   SCL -> SCL   in series with the load
//   OPT3001   SDA -> A4    SCL -> A5
//
// The chip keeps the running totals itself, so the sketch only reads them:
// joules of energy and coulombs of charge (3600 coulombs is one amp hour).
//
// Things to try. Swap the lamp for another model and watch the totals climb
// faster or slower. Drag the light slider on the OPT3001.

#include <Adafruit_INA228.h>
#include <ClosedCube_OPT3001.h>

Adafruit_INA228 meter;
ClosedCube_OPT3001 light;

void setup() {
  Serial.begin(9600);
  if (!meter.begin()) {
    Serial.println("No INA228");
    while (1);
  }
  meter.setShunt(0.015, 10.0);
  light.begin(0x44);
  OPT3001_Config config;
  config.rawData = 0;
  config.RangeNumber = 0b1100;      // automatic range
  config.ModeOfConversionOperation = 0b11;  // continuous, 100 ms
  light.writeConfig(config);
  Serial.println("Energy meter");
}

void loop() {
  delay(500);
  Serial.print(meter.getBusVoltage_V(), 2);
  Serial.print(" V  ");
  Serial.print(meter.readCurrent(), 0);
  Serial.print(" mA  ");
  Serial.print(meter.readPower(), 0);
  Serial.print(" mW  ");
  Serial.print(meter.readEnergy(), 2);
  Serial.print(" J  ");
  Serial.print(meter.readCharge(), 3);
  Serial.print(" C  panel ");
  Serial.print(light.readResult().lux, 0);
  Serial.println(" lux");
}