#include <LiquidCrystal.h>

// LCD display
const uint8_t RS_PIN = 10;
const uint8_t EN_PIN = 7;
const uint8_t BACKLIGHT_PIN = 6; // must be one of 3, 5, 6, 9, 10, or 11 for PWM
const uint8_t D4_PIN = 5;
const uint8_t D5_PIN = 4;
const uint8_t D6_PIN = 3;
const uint8_t D7_PIN = 2;


// Connections:
// LCD pin 1 to GND
// LCD pin 2 to +5
// LCD pin 3 resistor to GND (1k seems reasonable)
// LCD pin 4 (RS) to RS_PIN
// LCD pin 5 (R/W) to GND
// LCD pin 6 (E or EN) to EN_PIN
// LCD pin 7 (D0) no connect
// LCD pin 8 (D1) no connect
// LCD pin 9 (D2) no connect
// LCD pin 10 (D3) no connect
// LCD pin 11 (D4) to D4_PIN
// LCD pin 12 (D5) to D5_PIN
// LCD pin 13 (D6) to D6_PIN
// LCD pin 14 (D7) to D7_PIN
// LCD pin 15 (A) to BACKLIGHT_PIN
// LCD pins d4, d5, d6, d7 to Arduino pins 5, 4, 3, 2
LiquidCrystal lcd(RS_PIN, EN_PIN, D4_PIN, D5_PIN, D6_PIN, D7_PIN);

void setup()
{
    pinMode(BACKLIGHT_PIN, OUTPUT);
    analogWrite(BACKLIGHT_PIN, 40); // PWM the backlight
    lcd.begin(16,2);              // columns, rows.  use 16,2 for a 16x2 LCD, etc.
    lcd.clear();                  // start with a blank screen
    lcd.setCursor(0,0);           // set cursor to column 0, row 0 (the first row)
    lcd.print("Paul MacDougal");    // change this text to whatever you like. keep it clean.
    lcd.setCursor(0,1);           // set cursor to column 0, row 1
    lcd.print("GCBM v1.0");
  
    // Start up the Serial port
    Serial.begin(9600);
    while (!Serial);
    Serial.println(F("Initialized GCBM v1.0"));
  
}

void loop()
{
    uint16_t b1 = analogRead(A0);
    float v1 = b1 * 0.011977873; // 5.06/1023*(4700+3300)/3300.0
    uint16_t b2 = analogRead(A1);
    float v2 = b2 * 0.020103072; // 5.06/1023*(10000+3300)/3300.0
    uint16_t b3 = analogRead(A2);
    float v3 = b3 * 0.035620217; // 5.06/1023*(20000+3300)/3300.0
    uint16_t b4 = analogRead(A3);
    float v4 = b4 * 0.046774392; // 5.06/1023*(27400+3300)/3300.0
    uint16_t b5 = analogRead(A4);
    float v5 = b5 * 0.05483698; // 5.06/1023*(33000+3300)/3300.0
    uint16_t b6 = analogRead(A5);
    float v6 = b6 * 0.076933002; // 5.06/1023*(47500+3300)/3300.0
    
    lcd.clear();    
    lcd.setCursor(0,1);
    lcd.print(v1);

    lcd.setCursor(5,1);
    lcd.print(v2-v1);
    
    lcd.setCursor(10,1);
    lcd.print(v3-v2);
    
    lcd.setCursor(0,0);
    lcd.print(v4-v3);

    lcd.setCursor(5,0);
    lcd.print(v5-v4);
    
    lcd.setCursor(10,0);
    lcd.print(v6-v5);
    
    Serial.print(b1);
    Serial.print(" ");
    Serial.print(b2);
    Serial.print(" ");
    Serial.print(b3);
    Serial.print(" ");
    Serial.print(b4);
    Serial.print(" ");
    Serial.print(b5);
    Serial.print(" ");
    Serial.print(b6);
    Serial.println(" ");
    
    Serial.print(v1);
    Serial.print(" ");
    Serial.print(v2);
    Serial.print(" ");
    Serial.print(v3);
    Serial.print(" ");
    Serial.print(v4);
    Serial.print(" ");
    Serial.print(v5);
    Serial.print(" ");
    Serial.print(v6);
    Serial.println(" ");
    
    
    delay(1000);
} 

/* ------------------------------------------------------------------------------- */