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src/main.cpp

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+#include "Arduino.h"
+
+#ifndef LED_BUILTIN
+#define LED_BUILTIN 13
+#endif
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(1000);
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);
+}