diff --git a/pio/nrf52/test01/src/main.cpp b/pio/nrf52/test01/src/main.cpp
index 51ab96f..f49cf79 100644
--- a/pio/nrf52/test01/src/main.cpp
+++ b/pio/nrf52/test01/src/main.cpp
@@ -4,9 +4,11 @@ const int ledPin = 17;
 
 void setup() {
 	pinMode(ledPin, OUTPUT);
-	digitalWrite(ledPin, HIGH);
 }
 
 void loop() {
-    // put your main code here, to run repeatedly:
-}
\ No newline at end of file
+	digitalWrite(ledPin, HIGH);
+	delay(1000);
+	digitalWrite(ledPin, LOW);
+	delay(1000);
+}