Arduino Power Monitor

/*
 * Arduino Power Monitor
 *
 * learnelectronics
 * 18 JUL 2017
 *
 * www.youtube.com/c/learnelectronics
 * [email protected]
 */

#include <Wire.h>                                             //wire library for I2C comms
#include <Adafruit_SSD1306.h>                                 //driver for the oled
#include <INA219.h>                                           //driver for the ina219

#define OLED_RESET 4                                          //oled reset on pin 4



INA219 monitor;                                               //create instance of the INA219 called monitor
Adafruit_SSD1306 display(OLED_RESET);                         //create instance of the SSD1306 called display



void setup()   {

  monitor.begin();                                            //start the ina219
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);                  //start the oled
  display.display();                                          //show adafruit splash screen
  delay(2000);                                                //wait 2 seconds
  display.clearDisplay();                                     //clear buffer & display

}


void loop() {

  display.clearDisplay();                                     //begin each loop by clearing old data
  display.setTextSize(1);                                     //set to smallest text size
  display.setTextColor(WHITE);                                //set color to white
  display.setCursor(0,0);                                     //cursor to upper left

  display.print("shunt V: ");                                 //send title to buffer
  display.print(monitor.shuntVoltage() * 1000, 2);            //send shunt voltage to buffer in mV with 2 dec places
  display.println(" mV");                                     //send units to buffer

  display.print("shunt I: ");
  display.print(monitor.shuntCurrent() * 1000, 2);
  display.println(" mA");

  display.print("bus V:   ");
  display.print(monitor.busVoltage(), 2);
  display.println(" V");

  display.print("bus P:   ");
  display.print(monitor.busPower() * 1000, 2);
  display.println(" mW");

  display.display();                                          //show whats in the buffer
  delay(1000);                                                //wait one second before restarting the loop
}