Adding pauses to Metro

Metro.cpp

@@ -25,7 +25,7 @@ Metro::Metro(unsigned long interval_millis)
 
 Metro::Metro(unsigned long interval_millis, uint8_t autoreset)
 {   
-	this->autoreset = autoreset; 
+	this->autoreset = autoreset;
 	interval(interval_millis);
 	reset();
 }
@@ -35,6 +35,14 @@ void Metro::interval(unsigned long interval_millis)
   this->interval_millis = interval_millis;
 }
 
+void Metro::delay(unsigned long delay_millis) {
+    this->previous_millis += delay_millis;
+}
+
+void Metro::delayFromNow(unsigned long delay_millis) {
+    this->previous_millis = millis()+delay_millis;
+}
+
 // Benjamin.soelberg's check behavior:
 // When a check is true, add the interval to the internal counter.
 // This should guarantee a better overall stability.
@@ -45,15 +53,17 @@ void Metro::interval(unsigned long interval_millis)
 
 char Metro::check()
 {
-  if (millis() - this->previous_millis >= this->interval_millis) {
+  unsigned long now_millis = millis();
+  if (this->previous_millis<now_millis
+      &&(now_millis - this->previous_millis >= this->interval_millis)) {
     // As suggested by benjamin.soelberg@gmail.com, the following line 
     // this->previous_millis = millis();
     // was changed to
     // this->previous_millis += this->interval_millis;
 
     // If the interval is set to 0 we revert to the original behavior
     if (this->interval_millis <= 0 || this->autoreset ) {
-    	this->previous_millis = millis();
+    	this->previous_millis = now_millis;
 	} else {
 		this->previous_millis += this->interval_millis; 
 	}

Metro.h

@@ -1,6 +1,6 @@
 /*
-For license and instructions, please read Readme.md.
-*/
+ For license and instructions, please read Readme.md.
+ */
 
 #ifndef Metro_h
 #define Metro_h
@@ -14,6 +14,8 @@ class Metro
   Metro(unsigned long interval_millis);
   Metro(unsigned long interval_millis, uint8_t autoreset);
   void interval(unsigned long interval_millis);
+  void delay(unsigned long delay_millis);
+  void delayFromNow(unsigned long delay_millis);
   char check();
   void reset();
 

README.md

@@ -58,3 +58,11 @@ Changes the interval in milliseconds.
 
 Restarts/resets the Metro.
 
+# void delay(long millis)
+
+delays the triggering of the next successful check() for the specified amount of milliseconds. 
+
+# void delayFromNow(long millis)
+
+delays the triggering of the next successful check() for the specified amount of milliseconds after now.
+After millis() + the specified milliseconds the Metro goes back to normal operation 

keywords.txt

@@ -14,6 +14,8 @@ Metro	KEYWORD1
 
 check	KEYWORD2
 interval	KEYWORD2
+delay KEYWORD2
+delayFromNow KEYWORD2
 
 #######################################
 # Instances (KEYWORD2)