#include <LiquidCrystal.h>

#define input_1 A0

#define input_2 A1

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int AnalogValue = 0;

int PeakVoltage = 0;

float AverageVoltage = 0;

float input_A0 = 0;

float input_A1 = 0;

float output = 0;

float Resolution = 0.00488;

unsigned long sample = 0;

int threshold = 1000;

void setup()

{

lcd.begin(16,2);

Serial.begin(9600);

}

void loop()

{

PeakVoltage = 0;

for(sample = 0; sample < 5000; sample ++)

{

AnalogValue = analogRead(input_1);

if(PeakVoltage < AnalogValue)

{

PeakVoltage = AnalogValue;

}

else

{

delayMicroseconds(10);

}

}

input_A0 = PeakVoltage * Resolution;

PeakVoltage = 0;

for(sample = 0; sample < 5000; sample ++)

{

AnalogValue = analogRead(input_2);

if(PeakVoltage < AnalogValue)

{

PeakVoltage = AnalogValue;

}

else

{

delayMicroseconds(10);

}

}

input_A1 = PeakVoltage * Resolution;

output = (input_A0 - input_A1) * 100;

output = output * 4;

while(analogRead(input_A0) >= threshold)

{

lcd.clear();

lcd.setCursor(0,0);

lcd.print("Reached Maximum");

lcd.setCursor(0,1);

lcd.print("Limit!!!");

delay(1000);

lcd.clear();

lcd.setCursor(0,0);

lcd.print("Disconnect now!!");

delay(1000);

}

while(analogRead(input_A0) >= threshold)

{

lcd.clear();

lcd.setCursor(0,0);

lcd.print("Reached Maximum");

lcd.setCursor(0,1);

lcd.print("Limit!!!");

delay(1000);

lcd.clear();

lcd.setCursor(0,0);

lcd.print("Disconnect now!!");

delay(1000);

}

lcd.clear();

lcd.setCursor(0,0);

lcd.print("DIGITAL AMMETER");

lcd.setCursor(0,1);

lcd.print(output);

lcd.print(" mA");

Serial.print("Volatge Level at A0 = ");

Serial.println(analogRead(input_A0));

Serial.print("Volatge Level at A1 = ");

Serial.println(analogRead(input_A1));

Serial.println("------------------------------");

delay(1000);

}