#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 SENSOR_PIN 34
#define BUZZER_PIN 25

void setup() {

  Serial.begin(115200);

  pinMode(BUZZER_PIN, OUTPUT);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("OLED not found");
    while(true);
  }

  display.clearDisplay();
}

void loop() {

  int sensorValue = analogRead(SENSOR_PIN);

  int glucose = map(sensorValue, 0, 4095, 70, 200);

  Serial.print("Glucose Level: ");
  Serial.println(glucose);

  display.clearDisplay();

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,10);

  display.print("Glucose:");

  display.setCursor(0,40);
  display.print(glucose);
  display.print(" mg/dL");

  display.display();

  if(glucose > 160 || glucose < 80){
    digitalWrite(BUZZER_PIN, HIGH);
  }
  else{
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(1000);
}