Update platformio.ini for the examples

examples/wiring-blink/src/main.cpp

@@ -0,0 +1,29 @@
+/**
+ * Copyright (C) Ivan Kravets <me@ikravets.com>
+ * See LICENSE for details.
+ */
+
+/**
+  Turns ON and OFF the Wiring compatible board LED,
+  with intervals of 1 second (1000 milliseconds)
+*/
+
+#include "Arduino.h"
+
+#ifndef LED_PIN
+#define LED_PIN 13  // Most Arduino boards already have an LED attached to pin 13 on the board itself
+#endif
+
+
+void setup()
+{
+  pinMode(LED_PIN, OUTPUT);     // set pin as output
+}
+
+void loop()
+{
+  digitalWrite(LED_PIN, HIGH);  // set the LED on
+  delay(1000);                  // wait for a second
+  digitalWrite(LED_PIN, LOW);   // set the LED off
+  delay(1000);                  // wait for a second
+}