#include <LiquidCrystal_I2C.h>


LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows
const int sensor = 2;                //Sensor Pin
int current;                         //Current reading of Sensor
int count = 0;
int initial = LOW;  //Previous reading of Sensor

const int ButtonPin = 13;
int PastPress = HIGH;
int PresentPress;

int PotPin=A0;

int ReverseS = 4;
int ReverseState;

unsigned long NowTime = 0;
unsigned long PastTime = 0;
unsigned long Period = 100;

const int LED = 3;
void setup() {
  Serial.begin(9600);

  lcd.init();       // initialize the lcd
  lcd.backlight();  // open the backlight

  pinMode(sensor, INPUT);
  pinMode(ButtonPin, INPUT_PULLUP);
  pinMode(ReverseS, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
  pinMode(PotPin, INPUT);
}

void loop() {
  NowTime = millis();
  if (Period <= NowTime - PastTime) {
  PresentPress = digitalRead(ButtonPin);
    if (PastPress == PresentPress) {
      // digitalWrite(LED, digitalRead(ReverseS));
       if( analogRead(PotPin)<=512){
        digitalWrite(LED, HIGH);
        ReverseState=HIGH;
       }
       else{
         digitalWrite(LED, LOW);
         ReverseState=LOW;
       }
      current = digitalRead(sensor);
    

      if (initial != current) {  //if sensor senses change
        if (current == HIGH) {   //if being currently sensed
          initial = HIGH;
        } else {
          if (ReverseState == LOW) {
            count = count + 1;
          } else {
            count = count - 1;
          }
          Serial.println(count);  // print count to Serial Monitor

          lcd.clear();
          lcd.setCursor(0, 0);  // start to print at the first row
          lcd.print("Count: ");
          lcd.print(count);
          lcd.print("ft");

          initial = current;
        }
      }

    } else {
      count = 0;
      Serial.println(count);  // print count to Serial Monitor

      lcd.clear();
      lcd.setCursor(0, 0);  // start to print at the first row
      lcd.print("Count: ");
      lcd.print(count);
      lcd.print("ft");

      initial = current;
    }
  }
}