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

// Define the screen dimensions
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Define the I2C address for the display
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Define the analog input pin
const int analogPin = 34; // Change to the pin you are using

void setup() {
  // Start the display
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Use 0x3D if 0x3C doesn't work
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000); // Pause for 2 seconds

  // Clear the buffer
  display.clearDisplay();

  // Initialize serial communication
  Serial.begin(115200);
}

void loop() {
  // Read the analog input
  int sensorValue = analogRead(analogPin);
  // Convert the analog reading to voltage (assuming 3.3V reference)
  float voltage = sensorValue * (3.3 / 4095.0);
  // Convert voltage to millivolts
  int millivolts = voltage * 1000;

  // Display the voltage on the OLED
  display.clearDisplay();
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.print("Eng. Odeh Alamrow     Voltage (mV): ");
  display.print(millivolts);
  display.display();

  // Print the voltage to the Serial Monitor
  Serial.print("Voltage: ");
  Serial.print(millivolts);
  Serial.println(" mV");

  // Wait for a bit before the next loop
  delay(1000);
}