/*
    ************************************************************** 
    *        POWER & SWR meter on 2x16 char LCD display          *
    *                  By ON7EQ  Aug 2011                        *
    ************************************************************** 

  The circuit:
  
 * LCD RS pin to digital pin 7
 * LCD Enable pin to digital pin 8
 * LCD D4 pin to digital pin 9
 * LCD D5 pin to digital pin 10
 * LCD D6 pin to digital pin 11
 * LCD D7 pin to digital pin 12
 * LCD R/W pin to ground
 * GND to LCD VO pin (pin 3) (contrast)
 
 * pin 13 = LCD backlight control (1= backlight ON). Use an emittor follower (like BC639) to control LCD backlight (this draws about 120mA) 


 * pin 4 = connect a piezo buzzer (other end to ground) 


 * pin A0 : SWR probe FWD  voltage input (SWR bridge type 'MONIMATCH')
 * pin A1 : SWR probe REFL voltage input   

    ! Set the diode forward voltage in variable 'Diode'.  For 1SS99 or other Schottky diodes, it is around 130mV @ 0,1mA


 * pin A5 : Power Supply Voltage input  


MODE SELECT : there are 2 possibilities to select mode :
--------------------------------------------------------

1° with 3 position toggle switch:

* pin Digital 2 : 'bip' Sound Switch : when grounded -> SWR 'bip' tone mode
* pin Digital 3 : PEP mode Switch : when grounded -> PEP mode

  When switch in center position : normal power/swr mode, instant power & dBm readout
  When using a center toggle switch, Pin 5 must be connected to +5v 
  If a 3-way toggle switch is present, it will be automatically detected and the variable 'PushButton' set accordingly.

  
2° with push button for cyling modes:

* pin Digital 5 : Mode push button : when grounded (pulse), next mode is selected

When using a push button, Pins 2 and 3 must be connected to +5v ! 
! the mode is stored in EEPROM & memorized for next boot


BAND SELECT : 
-------------
It can be necessary to apply different parameters / calibration factors per band.

* pin Digital 6 : BAND push button : when grounded (pulse), next band is selected
 ! the band is stored in EEPROM & memorized for next boot

 */

// include the LCD library code:
//#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>

// include math functions
#include "math.h" 

// include EEPROM write
#include <EEPROM.h>


int a,b,c;
long volt,current,power,ah;
unsigned long msec = 0;
float time = 0.0;
int sample = 0;
float totalCharge = 0.0;
float averageAmps = 0.0;
float ampSeconds = 0.0;
long ampHours = 0;

// initialize the library with the numbers of the interface pins
//LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
LiquidCrystal_I2C lcd(0x27, 20, 4);


// *************************************************************   
// ********************  S  E  T  U  P  ************************
// *************************************************************   

void setup()
{
 
  lcd.begin(16, 2);
Serial.begin(9600);
}


void loop()

{
 for(int i=0;i<200;i++){
c = analogRead(A1);
a = analogRead(A0);
volt=volt+a;
  current=current+c;
 delay(1);
 }
 current=(current/200-514);
  if(current<1)current=0;
  current=current*7;// change the number to different value to calibrate the current sensor
   volt=volt/30;
   power=(volt*current)/1000;
 
     sample = sample + 1;
  
  msec = millis();
  
  
  
 time = (float) msec / 1000.0;
  
 totalCharge = totalCharge + (current);
  
 averageAmps = totalCharge / sample;
  
 ampSeconds = averageAmps*time;

 ampHours = ampSeconds/3600;

    Serial.print(volt);
      Serial.print("  ");
        Serial.print(current);
Serial.print("  ");
        Serial.print(power);

        Serial.print("  ");
        Serial.print(ampHours);
         Serial.print("  ");
        Serial.println(time);
        
 lcd.setCursor(6,0);
  lcd.print("V");
   b=volt%10;
   lcd.setCursor(5,0);
  lcd.print(b);
   b=(volt/10)%10;
   lcd.setCursor(4,0);
  lcd.print(b);
  lcd.setCursor(3,0);
  lcd.print(".");
   b=(volt/100)%10;
  lcd.setCursor(2,0);
  lcd.print(b);
  b=(volt/1000)%10;
 lcd.setCursor(1,0);
  if(volt>999)lcd.print(b);
 else lcd.print(" ");
  
  lcd.setCursor(14,0);
  lcd.print("A");
  
   b=current%10;
     lcd.setCursor(13,0);
  lcd.print(b);
    b=(current/10)%10;
     lcd.setCursor(12,0);
  lcd.print(b);
   lcd.setCursor(11,0);
  lcd.print(".");
   b=(current/100)%10;
     lcd.setCursor(10,0);
  lcd.print(b);
 

   lcd.setCursor(6,1);
  lcd.print("W");
   b=power%10;
   lcd.setCursor(5,1);
  lcd.print(b);
   b=(power/10)%10;
   lcd.setCursor(3,1);
  lcd.print(b);
  lcd.setCursor(4,1);
  lcd.print(".");
   b=(power/100)%10;
  lcd.setCursor(2,1);
  if(power>99)lcd.print(b);
  else lcd.print(" ");
  b=(power/1000)%10;
  
  lcd.setCursor(1,1);
  if(power>999)lcd.print(b);
  else lcd.print(" ");
//------------
  lcd.setCursor(14,1);
  lcd.print("AH");
  
   b=ampHours%10;
     lcd.setCursor(13,1);
  lcd.print(b);
    b=(ampHours/10)%10;
     lcd.setCursor(12,1);
  lcd.print(b);
   lcd.setCursor(11,1);
  lcd.print(".");
   b=(ampHours/100)%10;
     lcd.setCursor(10,1);
  lcd.print(b);
     b=(ampHours/1000)%10;
     lcd.setCursor(9,1);
  lcd.print(b);
 
  delay(100);
  
}