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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define ANALOG_PIN A0
#define POT_PIN A1
#define SCALE 4 // 4 default

int readValue = 0;
int potValue = 0;

void setup() {
   display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
   display.clearDisplay();
   display.display();
   display.setTextSize(1);
   display.setTextColor(WHITE);

   pinMode(ANALOG_PIN, INPUT);
   pinMode(POT_PIN, INPUT);
}

void loop() {
   display.clearDisplay();



   
potValue = analogRead(POT_PIN);

   for(int i=0; i<SCREEN_WIDTH; i++) {
      
      delayMicroseconds(potValue);

      readValue = analogRead(ANALOG_PIN);
      int y = map(readValue, 0, 1023, SCREEN_HEIGHT, 0);

      display.drawPixel(i, y / SCALE, WHITE);
   }


  display.setCursor(0, 0);
  display.print("Voltage: ");
  display.print(readValue * (5.0 / 1023.0)); // convert to voltage
  display.print(" V");

   display.display();
}