// Suitable with 12v battery, adaptor wattage, current and voltage monitoring.
// Resistor divider network need more upgradation if voltage is higher that 15.6
// Try 0x3D OLED address if screen did not work.
// Precision of the voltage depends on the tolerance of the resistors.

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define OLED_RESET -1
Adafruit_SSD1306 display(128, 64, &Wire, OLED_RESET);

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Change the address to your's one
  display.clearDisplay();
  // Start up the library
  sensors.begin();
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 30);
  // Display static text
  display.println("F4IYT 1.00"); //Write custom text here
  display.display(); 
  delay(100);
  // Scroll in various directions, pausing in-between:
  display.startscrollright(0x00, 0x0F);
  delay(2000);
  display.stopscroll();
  delay(1000);
  display.startscrollleft(0x00, 0x0F);
  delay(1000);
  display.stopscroll();
  delay(1000);
  display.startscrolldiagright(0x00, 0x07);
  delay(1000);
  display.startscrolldiagleft(0x00, 0x07);
  delay(1000);
  display.stopscroll();
  delay(1000);
}

float Vref=5.00;
float pts=1024.0;
//5v
float R4=10000.0; // R4 10K 
float R6=10000.0; // R6 10K
//12v
float R3=100000.0; // R4 100K 
float R5=10000.0; // R6 10K
//27v
float R1=100000.0; // R4 100K 
float R2=10000.0; // R6 10K

//amp => 0.100 for 20A, 0.185 for 30A, 0.66 for 5A
// follow this link:
//https://startingelectronics.org/articles/arduino/measuring-voltage-with-arduino/
float amp=0.185;

void loop() {
  // put your main code here, to run repeatedly:
  int adc0 = analogRead(A0);
  int adc1 = analogRead(A1);
  int adc2 = analogRead(A2);
  int adc3 = analogRead(A3);
  int adc6 = analogRead(A6);
  int adc7 = analogRead(A7);
  //Gestion 27v
  float voltage0 = (adc0 * Vref) / pts;
  float voltage1 = (((adc1 * Vref)/pts)/(R2/(R1+R2)));        // resistor divider basics needed to be learn 
  float current0 = (voltage0 - 2.5) / amp;
  //Gestion 12v
  float voltage2 = (adc2 * Vref) / pts;
  float voltage3 = (((adc3 * Vref)/pts)/(R5/(R3+R5)));        // resistor divider basics needed to be learn 
  float current2 = (voltage2 - 2.5) / amp;
  //Gestion 5V
  float voltage6 = (adc6 * Vref) / pts;
  float voltage7 = (((adc7 * Vref)/pts)/(R6/(R4+R6)));        // resistor divider basics needed to be learn 
  float current6 = (voltage6 - 2.5) / amp; 


  // request to all devices on the bus
  sensors.requestTemperatures(); // Send the command to get temperatures

  // After we got the temperatures, we can print them here.
  // We use the function ByIndex, and as an example get the temperature from the first sensor only.
  float tempC0 = sensors.getTempCByIndex(0);
  float tempC1 = sensors.getTempCByIndex(1);
  float tempC2 = sensors.getTempCByIndex(2);


  //Check
  if (voltage1<0.99) {
    voltage1=0.00;
  }
  if (voltage3<0.99) {
    voltage3=0.00;
  }
  if (voltage7<0.99) {
    voltage7=0.00;
  }
  if (current0 < 0.16) {
    current0 = 0;
  }
  if (current2 < 0.16) {
    current2 = 0;
  }
  if (current6 < 0.16) {
    current6 = 0;
  }
  if (tempC0<0.00) {
    tempC0=0.00;
  }
  if (tempC1<0.00) {
    tempC1=0.00;
  }
  if (tempC2<0.00) {
    tempC2=0.00;
  }
  //if (Serial.available()>0) {
    //if (Serial.read()=='m') {
      //Courant
      Serial.print(current0);     
      Serial.print(F(","));
      Serial.print(current2);
      Serial.print(F(","));
      Serial.print(current6);
      Serial.print(F(","));
      //Tension
      Serial.print(voltage1);     
      Serial.print(F(","));
      Serial.print(voltage3);
      Serial.print(F(","));
      Serial.print(voltage7);
      Serial.print(F(","));
      //Temperature
      Serial.print(tempC0);     
      Serial.print(F(","));
      Serial.print(tempC1);
      Serial.print(F(","));
      Serial.print(tempC2);
      Serial.print(F("\n"));     
    //}
  //}
  
  //Gestion display  
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);

  display.setCursor(0,0);
  display.print("A: ");
  display.print(current0);
  display.display();

  display.setCursor(0,10);
  display.print("V: ");
  display.print(voltage1);
  display.display();

  display.setCursor(0,20);
  display.print("P: ");
  display.print(current0*voltage1);
  display.display();

  display.setCursor(60,0);
  display.print("A: ");
  display.print(current2);
  display.display();

  display.setCursor(60,10);
  display.print("V: ");
  display.print(voltage3);
  display.display();

  display.setCursor(60,20);
  display.print("P: ");
  display.print(current2*voltage3);
  display.display();

  display.setCursor(0,30);
  display.print("A: ");
  display.print(current6);
  display.display();

  display.setCursor(0,40);
  display.print("V: ");
  display.print(voltage7);
  display.display();

  display.setCursor(0,50);
  display.print("P: ");
  display.print(current6*voltage7);
  display.display();

  display.setCursor(60,30);
  display.print("T0: ");
  display.print(tempC0);
  display.display();

  display.setCursor(60,40);
  display.print("T1: ");
  display.print(tempC1);
  display.display();

  display.setCursor(60,50);
  display.print("T2: ");
  display.print(tempC2);
  display.display();

      
  delay(3000);
}