initial

Metro/examples/blinking/blinking.ino

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+/*
+ This code will blink an LED attached to pin 13 on and off. 
+ It will stay on for 0.25 seconds.
+ It will stay off for 1 second.
+ */
+#include <Metro.h> //Include Metro library
+#define LED 13 // Define the led's pin
+
+//Create a variable to hold theled's current state
+int state = HIGH;
+
+// Instanciate a metro object and set the interval to 250 milliseconds (0.25 seconds).
+Metro ledMetro = Metro(250); 
+
+void setup()
+{
+  pinMode(LED,OUTPUT);
+  digitalWrite(LED,state);
+}
+
+void loop()
+{
+
+  if (ledMetro.check() == 1) { // check if the metro has passed its interval .
+    if (state==HIGH)  state=LOW;
+    else state=HIGH;
+    
+    digitalWrite(LED,state);
+  }
+}