add some variables to play with...

src/main.cpp

@@ -6,11 +6,13 @@ void setup()
   pinMode(LED_BUILTIN, OUTPUT);
 }
 
+int a = 1000;
+int b = 100;
 void loop()
 {
   // put your main code here, to run repeatedly:
   digitalWrite(LED_BUILTIN, HIGH);
-  delay(100);
+  delay(a);
   digitalWrite(LED_BUILTIN, LOW);
-  delay(200);
+  delay(b);
 }