diff --git a/blinking-serial.ino b/blinking-serial.ino
index d7d9eac..5649c0d 100644
--- a/blinking-serial.ino
+++ b/blinking-serial.ino
@@ -9,11 +9,11 @@
 
 // this variable is defined in pins_arduino.h for DOIT ESP32 DEVKIT V1
 // int LED_BUILTIN = 02; 
-int LED_ONBOARD = 02;
+int LED = 02;
 
 void setup() {
   // put your setup code here, to run once:
-  pinMode(LED_BUILTIN, OUTPUT);
+  pinMode(LED, OUTPUT);
   //serial  monitor setup
   Serial.begin(115200);
 }
@@ -21,10 +21,10 @@ void setup() {
 void loop() {
   // put your main code here, to run repeatedly:
   Serial.print("ON");
-  digitalWrite(LED_BUILTIN, HIGH);
+  digitalWrite(LED, HIGH);
   delay(500);
   // after delay
   Serial.print(" - OFF\n");
-  digitalWrite(LED_BUILTIN, LOW);
+  digitalWrite(LED, LOW);
   delay(500);
 }