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

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int pulsePin = A0; // Connect the potentiometer's middle pin to A0

void setup() {
  Serial.begin(9600);
  pinMode(pulsePin, INPUT);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Initialize the OLED display
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
}

void loop() {
  int pulseValue = analogRead(pulsePin);
  int heartRate = map(pulseValue, 0, 1023, 40, 200); // Map the potentiometer values to a range of possible heart rates

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

  delay(200);
}