// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
//---------------------------------------------------------------------------------------------
int analogPin = 0;//potentiometer wiper (middle terminal)connected to analog pin A5
int analogvalue = 0; // variable to store the value read
//-----------------------------------------------------------------------------------------
int digitalPin = 10;    // pushbutton connected to digital pin 7
int digitalvalue = 0;      // variable to store the read value
//-----------------------------------------------------------------------------------------
int counteranalog = 5 ;
int counterdigital = 0 ;
int previousdigitalvalue = 1 ;
//-----------------------------------------------------------------------------------------
void setup() {
  pinMode(digitalPin, INPUT_PULLUP);    // sets the digital pin 7 as input pull up
  Serial.begin(9600); // setup serial
  lcd.begin(16, 2);//lcd set up
}
//------------------------------------------potentiometer-----------------------------------------------
void loop() {
  analogvalue = analogRead(analogPin); // read the input analog pin
  float voltage = (analogvalue/204.6);//converts to readable voltage 
//----------------------------------digital counter--on/off------------------------------------ 
if (voltage<= 2.6)
{
  if (voltage == 2.5)
  {
  counteranalog++;
  lcd.setCursor(11,0);
  lcd.print(counteranalog);  
  }
}


  lcd.setCursor(0,0);
  lcd.print(voltage);
  lcd.setCursor(4,0);
  lcd.print("V");
  lcd.setCursor(11,0);
  lcd.print(counteranalog);



//------------------------------------on off switch-----------------------------------------------------
  
digitalvalue = digitalRead(digitalPin);  // read the input digital pin

if (digitalvalue == 0)
        {
        Serial.print("Switch:ON ");
        Serial.print(" ");  
        Serial.println(digitalvalue);
        Serial.print("voltage =");
        Serial.print(" ");
        Serial.println(voltage);

        lcd.setCursor(0,1);
        lcd.print("Switch:ON ");
        }
        
//----------------------------------------counter-------------------------------
if (digitalvalue == 0)
{
if (previousdigitalvalue != digitalvalue)
{
    counterdigital++;
    lcd.setCursor(11,1);
    lcd.print(counterdigital);   
}   
}
previousdigitalvalue = digitalvalue; 
//----------------------------------digital counter--on/off------------------------------------        
       
if (digitalvalue == 1)
        {
        Serial.print("Switch:OFF ");
        Serial.print(" ");  
        Serial.print(digitalvalue);
        Serial.print(" ");
        Serial.print("voltage =");
        Serial.print(" ");
        Serial.println(voltage);
        lcd.setCursor(0,1);
        lcd.print("Switch:OFF");
        lcd.setCursor(11,1);
        lcd.print(counterdigital);
        }
}