/*This software is provided in an “AS IS” condition,NO WARRANTIES in any form apply to this software.
 picmicrolab.com 10.5.2017
***************************************************************************************************************
Arduino LCD Bargraph Voltmeter Sketch

Input Voltage - A0; 0-5v

*/

int Bit_0 =  2;
int Bit_1 =  3;
int Bit_2 =  4;
int Bit_3 =  5;
int Bit_4 =  6;
int Bit_5 =  7;
int Bit_6 =  8;
int Bit_7 =  9;
int RS =  10;
int EN =  11;

//int BinaryValue =  0;

int VoltageBarValue = 0;
int LCD_Address = 0x80;


// the setup function runs once when you press reset or power the board
void setup() {
  // initialize I/O as output.
  pinMode(Bit_0, OUTPUT);  //Bit_0
  pinMode(Bit_1, OUTPUT);  //Bit_1
  pinMode(Bit_2, OUTPUT);  //Bit_2
  pinMode(Bit_3, OUTPUT);  //Bit_3
  pinMode(Bit_4, OUTPUT);  //Bit_4
  pinMode(Bit_5, OUTPUT);  //Bit_5
  pinMode(Bit_6, OUTPUT);  //Bit_6
  pinMode(Bit_7, OUTPUT);  //Bit_7
  
  pinMode(RS, OUTPUT);  //Bit_10
  pinMode(EN, OUTPUT);  //Bit_11
 
  InitLCD();
}

void loop() 
{
int analog_input = analogRead(A0);
ShowLCD_BarGraph (analog_input / 4.0 );//Normalize voltage full scale to 256
//to show 16 segments at Max = 5v;
}

void ShowLCD_BarGraph (int VoltageBarValue)
{
  LCD_Address = 0x80;
  while(VoltageBarValue > 0)
  {
    LCDC(LCD_Address);
    LCDD(0xff);
    VoltageBarValue=VoltageBarValue-15;
    LCD_Address++;
  }


    //-----------------Clear previous locations----
    while(LCD_Address <= 0x8f)
    {
      LCDD(0xfe);
      LCD_Address++;
    }
}

void ConvertNumToBinary(int digit)
{
//--------------BIT_0------------ 
if(bitRead(digit, 0)== 1)
digitalWrite(Bit_0, HIGH);
if(bitRead(digit, 0)== 0)
digitalWrite(Bit_0, LOW);
//-------------------------------

//--------------BIT_1------------ 
if(bitRead(digit, 1) == 1)
digitalWrite(Bit_1, HIGH);
if(bitRead(digit, 1) == 0)
digitalWrite(Bit_1, LOW);
//-------------------------------

//--------------BIT_2------------ 
if(bitRead(digit, 2) == 1)
digitalWrite(Bit_2, HIGH);
if(bitRead(digit, 2) == 0)
digitalWrite(Bit_2, LOW);
//-------------------------------

//--------------BIT_3------------ 
if(bitRead(digit, 3) == 1)
digitalWrite(Bit_3, HIGH);
if(bitRead(digit, 3) == 0)
digitalWrite(Bit_3, LOW);
//-------------------------------

//--------------BIT_4------------ 
if(bitRead(digit, 4) == 1)
digitalWrite(Bit_4, HIGH);
if(bitRead(digit, 4) == 0)
digitalWrite(Bit_4, LOW);
//-------------------------------

//--------------BIT_5------------ 
if(bitRead(digit, 5) == 1)
digitalWrite(Bit_5, HIGH);
if(bitRead(digit, 5) == 0)
digitalWrite(Bit_5, LOW);
//-------------------------------

//--------------BIT_6------------ 
if(bitRead(digit, 6) == 1)
digitalWrite(Bit_6, HIGH);
if(bitRead(digit, 6) == 0)
digitalWrite(Bit_6, LOW);
//-------------------------------

//--------------BIT_7------------ 
if(bitRead(digit, 7) == 1)
digitalWrite(Bit_7, HIGH);
if(bitRead(digit, 7) == 0)
digitalWrite(Bit_7, LOW);
//-------------------------------
}

void InitLCD()
{
delay(20);
//ConvertNumToBinary(0x30);

LCDC(0x30);
delay(5);
//-----------------
LCDC(0x30);
delay(5);
//-----------------
LCDC(0x30);
delay(1);
//-----------------
//; display clear
LCDC(0x01);
delay(1);
//-----------------
// ID=1,S=0 increment,no  shift 000001 ID S
LCDC(0x06);
delay(1);
//-----------------
//D=1,C=B=0 set display ,no cursor, no blinking
LCDC(0x0c);
delay(1);
//------------------
// dl=1 ( 8 bits interface,n=12 lines,f=05x8 dots)
LCDC(0x38);
delay(1);
//------------------


}
void LCDC(int command)
{
//RS = 0 ;EN = 0 ;
digitalWrite(RS, LOW);
digitalWrite(EN, LOW);
ConvertNumToBinary(command);
//; EN=1,RS=0
digitalWrite(RS, LOW);
digitalWrite(EN, HIGH);
delay(1);
//; EN=0,RS=0
digitalWrite(RS, LOW);
digitalWrite(EN, LOW);
delay(1);
}

void LCDD(int data)
{
//RS = 1 ;EN = 0 ;
digitalWrite(RS, HIGH);
digitalWrite(EN, LOW);
ConvertNumToBinary(data);
//; EN=1,RS=1
digitalWrite(RS, HIGH);
digitalWrite(EN, HIGH);
delay(1);
//; EN=0,RS=1
digitalWrite(RS, HIGH);
digitalWrite(EN, LOW);
delay(1);
}