   
   minutes++;
 }
+
+void stopwatch() {
+  display.clearDisplay();
+  if (stopWatchStart != -1) {
+    unsigned long stopTime = uptime - stopWatchStart; 
+  }
+}

#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

void setup() {
 Serial.begin(9600);


  display.setTextSize(4);
  display.setTextColor(WHITE);
}

void loop() {
  uptime = millis();
  demo();
}

