test program for demo

Revision:
0:333c69338ddf
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Apr 16 09:05:50 2018 +0000
@@ -0,0 +1,11 @@
+#include "mbed.h"
+
+DigitalOut led1(LED1);
+
+// main() runs in its own thread in the OS
+int main() {
+    while (true) {
+        led1 = !led1;
+        wait(0.5);
+    }
+}
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