// include the library code:
#include <LiquidCrystal.h>
#define delay_1 800


#define b_nav 16
#define b_ok 18
#define b_back 19
#define l_charge 17
#define a_charge A6
#define a_batt A7

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 6, 2, 3, 4, 5);


//Analog volt read pin
//const int voltPin = A7;

// Variables for voltage divider
float denominator;
int resistor1 = 22000; // Values measured in circuit
int resistor2 = 2200;  // for better accuracy
// ----------------------------------------------------


// Function declarations -----------------------------------------------------------------
void volt_batt (void);           // Read and display voltage
//-----------------------------------------------------------------------------------------



void setup() {

	pinMode(b_nav, INPUT);
	pinMode(b_ok, INPUT);
	pinMode(b_back, INPUT);
	pinMode(l_charge, OUTPUT);
	lcd.begin(16, 2);
	// Print a message to the LCD.
	lcd.print("PowerTester v01");
	//Convert resistor values to division value
	//  Equation is previously mentions voltage divider equation
	//  R2 / (R1 + R2)
	//  In this case returns 0.20 or 1/5
	denominator = (float)resistor2 / (resistor1 + resistor2);

	digitalWrite(l_charge, LOW);

} // Void Setup Close

void loop() {

//	lcd.setCursor(0, 1); // bottom left
//	lcd.print("");

	if (!digitalRead(b_nav)) {
		volt_batt();
	}

	else if (!digitalRead(b_ok)) {
		digitalWrite(l_charge, !digitalRead(l_charge));
		lcd.setCursor(0, 1); // bottom left
		lcd.print("Charge is toggled");
		delay(500);
	}

	else if (!digitalRead(b_back)) {
		float voltage_c;
		float cur_c;
		//Obtain RAW voltage data
		voltage_c = analogRead(a_charge);

		//Convert to actual voltage (Calibrated by hand)
		voltage_c = (voltage_c / 1024) * 3.3;

		cur_c = voltage_c / 0.5;

		//Output to LCD
		lcd.setCursor(0, 1); // bottom left
		lcd.print("cur C =   ");
		lcd.setCursor(11,1);
		lcd.print(cur_c);

		//Delay to make LCD readable
		delay(500);
	}

	else {
		volt_batt();
	}


} // void loop close


void volt_batt(void) {

	float voltage;
	//Obtain RAW voltage data
	voltage = analogRead(a_batt);

	//Convert to actual voltage (Calibrated by hand)
	voltage = (voltage / 1024) * 3.3;

	//Convert to voltage before divider
	//  Divide by divider = multiply
	//  Divide by 1/5 = multiply by 5
	voltage = voltage / denominator;

	//Output to LCD
	lcd.setCursor(0, 1); // bottom left
	lcd.print("Batt V =  ");
	lcd.setCursor(10,1);
	lcd.print(voltage);

	//Delay to make LCD readable
	delay(500);
}