solar.c

#include <LiquidCrystal_I2C.h>

#define NUM_SAMPLES_V 30
#define NUM_SAMPLES_C 


#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Arduino.h>

LiquidCrystal_I2C lcd(0x27,20,4);


double calibration_v;
double vb;  //voltage battery
double cl;  //current load
double vp;  //panel voltage
double cp;  //panel current
double pp;  //panel power
double pl;  //load power

static const unsigned long REFRESH_INTERVAL = 1000; // ms
static unsigned long lastRefreshTime = 0;



void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  

}

void loop() {

  if (Serial.available() > 0) {
    String data = Serial.readStringUntil('\n');
  }

  calibration_v = 331;//analogRead(A0);
  vb = get_voltage(A1);
  cl = get_current(A6);
  vp = get_voltage(A2);
  cp = get_current(A3);

  pp = vp * cp;
  pl = vb * cl;

  if(millis() - lastRefreshTime >= REFRESH_INTERVAL){
    lastRefreshTime += REFRESH_INTERVAL;
    serial_send();
    update_display();
  }
  
  
}

void serial_send(){
  Serial.println("{'vb': " + String(vb) + ", 'cl': " + String(cl) + ", 'vp': " + String(vp) + ", 'cp': " + String(cp) + ", 'pp': " + String(pp) + ", 'pl': " + String(pl) + "}");
  //Serial.println(cl);
}

void update_display(){
  lcd.setCursor(0, 0);
  lcd.print("VB " + String(vb) + " CL " + String(cl));
  lcd.setCursor(0, 1);
  lcd.print("VCal " + String(calibration_v));

  
  lcd.setCursor(0, 2);
  lcd.print("VP " + String(vp) + " CP " + String(cp));

  lcd.setCursor(0, 3);
  lcd.print("PP " + String(pp) + " PL " + String(pl));
}

double get_voltage(int pin){
  int sample_count = 0;
  int sum = 0;
  while (sample_count < NUM_SAMPLES_V) {
    sum += analogRead(pin);
    sample_count++;
    delay(2);
  }
  double voltage = (((float)sum / (float)NUM_SAMPLES_V) * 5.0) / 1024.0;
  
  return voltage*(4 + calibration_v/1000); //4.587
}


double get_current(int pin){
  double sample_count = 0;
  double sum = 0.0;
    float volt_c = analogRead(pin)*5/1023.0;
    float current_T = (volt_c-2.5)/0.66;
    delay(2);
  float current = current_T;
  return current*10;
}