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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Pin Definitions
const int potPin = 34;       // Potentiometer simulating sensor
const int buzzerPin = 18;
const int redLEDPin = 19;
const int greenLEDPin = 23;
const int buttonPin = 16;

bool alertActive = false;

void setup() {
  Serial.begin(115200);

    pinMode(buzzerPin, OUTPUT);
      pinMode(redLEDPin, OUTPUT);
        pinMode(greenLEDPin, OUTPUT);
          pinMode(buttonPin, INPUT);

            // OLED Initialization
              if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
                  Serial.println("OLED failed");
                      while (true);
                        }
                          display.clearDisplay();
                            display.setTextSize(1);
                              display.setTextColor(SSD1306_WHITE);
                              }

                              void loop() {
                                int potValue = analogRead(potPin); // Range: 0-4095

                                  // Simulate sensor values from pot input
                                    int heartRate = map(potValue, 0, 4095, 50, 130);    // Simulated HR
                                      int spo2 = map(potValue, 0, 4095, 85, 100);         // Simulated SpO2

                                        display.clearDisplay();
                                          display.setCursor(0, 10);
                                            display.print("Heart Rate: ");
                                              display.print(heartRate);
                                                display.println(" bpm");

                                                  display.print("SpO2: ");
                                                    display.print(spo2);
                                                      display.println(" %");

                                                        display.display();

                                                          // Check health status
                                                            if (heartRate < 60 || heartRate > 110 || spo2 < 90) {
                                                                digitalWrite(redLEDPin, HIGH);
                                                                    digitalWrite(greenLEDPin, LOW);
                                                                        digitalWrite(buzzerPin, HIGH);
                                                                            alertActive = true;
                                                                              } else {
                                                                                  digitalWrite(greenLEDPin, HIGH);
                                                                                      digitalWrite(redLEDPin, LOW);
                                                                                          if (!alertActive) {
                                                                                                digitalWrite(buzzerPin, LOW);
                                                                                                    }
                                                                                                      }

                                                                                                        // Button to reset alert/buzzer
                                                                                                          if (digitalRead(buttonPin) == HIGH) {
                                                                                                              digitalWrite(buzzerPin, LOW);
                                                                                                                  alertActive = false;
                                                                                                                    }

                                                                                                                      delay(500);
                                                                                                                      }