diff --git a/arduino/Blink_STM32_PC13.ino b/arduino/Blink_STM32_PC13.ino
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+++ b/arduino/Blink_STM32_PC13.ino
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+/*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+
+  Most Arduinos have an on-board LED you can control. On the Uno and
+  Leonardo, it is attached to digital pin 13. If you're unsure what
+  pin the on-board LED is connected to on your Arduino model, check
+  the documentation at http://arduino.cc
+
+  This example code is in the public domain.
+
+  modified 8 May 2014
+  by Scott Fitzgerald
+  
+  Modified by Roger Clark. www.rogerclark.net for Maple mini 25th April 2015 , where the LED is on PC13
+  
+ */
+
+
+// the setup function runs once when you press reset or power the board
+void setup() {
+  // initialize digital pin PB1 as an output.
+  pinMode(PC13, OUTPUT);
+}
+
+// the loop function runs over and over again forever
+void loop() {
+  digitalWrite(PC13, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);              // wait for a second
+  digitalWrite(PC13, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);              // wait for a second
+}