#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define SCREEN_I2C_ADDRESS 0x3C
#define OLED_RESET_PIN -1
#define CLK 2
#define DT 3
#define SW 4

Adafruit_SSD1306 screen(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET_PIN);

int potenial_meter_value;
int old_potenial_value = 0;
int new_potenial_value = 0;
int rotary_encoder_baar = 0;
int currentStateCLK;
int lastStateCLK;

void lcd_data(){
  screen.clearDisplay();
	screen.setCursor(0,0);
	screen.print("Potenial Meter ");
	screen.drawRect(0,16,128,15,WHITE);
	screen.fillRect(0,16,old_potenial_value,15,WHITE);
	screen.setCursor(0,32);
	screen.print("Rotary Encoder ");	
	screen.drawRect(0,48,128,15,WHITE);
	screen.fillRect(0,48,rotary_encoder_baar,15,WHITE);	
  screen.display();	
}

void setup() {
	Serial.begin(115200);
	pinMode(CLK,INPUT);
	pinMode(DT,INPUT);
	pinMode(SW, INPUT_PULLUP); 
	lastStateCLK = digitalRead(CLK); 
	rotary_encoder_baar = 0;	
  // put your setup code here, to run once:
  screen.begin(SSD1306_SWITCHCAPVCC, SCREEN_I2C_ADDRESS);
	pinMode(A0, INPUT);
  screen.setTextSize(1);
  screen.setTextColor(WHITE); 
	lcd_data();  
}

void loop() {
	currentStateCLK = digitalRead(CLK);
	potenial_meter_value = analogRead(A0);
	old_potenial_value = potenial_meter_value /7.99;
	if(new_potenial_value != old_potenial_value){
		lcd_data();
		new_potenial_value = old_potenial_value;
	}
	
 	
	// if(potenial_meter_value == potenial_meter_value + 8)
	// delay(100);
  if (currentStateCLK != lastStateCLK  && currentStateCLK == 1){
		  
		if (digitalRead(DT) != currentStateCLK) {
			rotary_encoder_baar = rotary_encoder_baar - 16;
			if(rotary_encoder_baar == -16){
				rotary_encoder_baar = 0;
			}
		}else{
			rotary_encoder_baar = rotary_encoder_baar + 16;
			if(rotary_encoder_baar == 144){
				rotary_encoder_baar = 128;
			}
		}
		lcd_data();
		Serial.println(rotary_encoder_baar);	
	}	
	
	lastStateCLK = currentStateCLK;

  // put your main code here, to run repeatedly:

}