#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

int sw1 = 12, sw2 = 11;
int led1 = 7, led2 = 6;
int in1 = 0;

float ValueIn = 0;

#define CLK 8
#define DT 9
#define SW 10

int counter = 0;
int currentStateCLK;
int lastStateCLK;
String currentDir ="";
unsigned long lastButtonPress = 0;


void setup() {
	pinMode(CLK,INPUT);
	pinMode(DT,INPUT);
	pinMode(SW, INPUT_PULLUP);

	Serial.begin(9600);

	lastStateCLK = digitalRead(CLK);

  lcd.init(); //can use lcd.begin();
  lcd.backlight(); // on-off background
  
  //display lcd
  lcd.setCursor(0,0);
  lcd.print("PV: ");
  lcd.setCursor(12, 0);
  lcd.print("(mA)");
}

void loop() {
	currentStateCLK = digitalRead(CLK);

	if (currentStateCLK != lastStateCLK  && currentStateCLK == 1){

		if (digitalRead(DT) != currentStateCLK) {
      if(counter < 0){
        counter = 0;
      }
      else{
        counter ++;
      }
      ValueIn = 0.1 * counter;

      lcd.setCursor(0,1); lcd.print("LOW: ");
      if(ValueIn > 20){
        ValueIn = 20;
      }
      else{
        lcd.setCursor(5,1); lcd.print(ValueIn,1);
      }
		} 
    else {
			counter --;
      ValueIn = 0.1 * counter;

      lcd.setCursor(0,1); lcd.print("LOW: ");
      if(ValueIn < 0){
        ValueIn = 0;
      }
      else{
        lcd.setCursor(5,1); lcd.print(ValueIn,1);
      }
		}
	}

	lastStateCLK = currentStateCLK;

	int btnState = digitalRead(SW);

	

	delay(1);
}