VS Arduino - Using millis() in a class method

Mar 18^th, 2026 at 3:06pm (UTC)

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VS Arduino › › › Using millis() in a class method - out of scope

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Using millis() in a class method - out of scope (Read 6254 times)

davidbal Junior Member Offline Posts: 29 Joined: Dec 20^th, 2015	Using millis() in a class method - out of scope Jul 25^th, 2017 at 11:16am	Print Post
	When I try to use millis() in a class method e.g. void GeneralTimer::startTimer(unsigned long dur) { duration = dur; startTime = millis(); endTime = startTime + duration; } The compiler complains millis() is out of scope. I can understand why as it is a standard arduino library, but can't see a way of resolving the scope. I have seen an example here https://learn.adafruit.com/multi-tasking-the-arduino-part-1/a-classy-solution where it seems to work, although it is all defined within the class. Any tips? Regards, David


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Tim@Visual Micro Administrator Offline Posts: 12204 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Using millis() in a class method - out of scope Reply #1 - Jul 25^th, 2017 at 11:32am	Print Post
	have you included the arduino.h in your code?


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davidbal Junior Member Offline Posts: 29 Joined: Dec 20^th, 2015	Re: Using millis() in a class method - out of scope Reply #2 - Jul 25^th, 2017 at 11:59am	Print Post
	Thanks, that fixed the problem. It is quite a big project with multiple files and thought it might of already been included. But obviously not. I get the feeling that the .ino file includes that file automatically? Regards, David


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Tim@Visual Micro Administrator Offline Posts: 12204 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Using millis() in a class method - out of scope Reply #3 - Jul 25^th, 2017 at 12:21pm	Print Post
	Yes when .ino is converted to .cpp the include is added When you create new .cpp/h files using the visual micro menus the arduino.h is included for you If you create your own cpp/h files manually you will always need to include the arduino.h


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davidbal Junior Member Offline Posts: 29 Joined: Dec 20^th, 2015	Re: Using millis() in a class method - out of scope Reply #4 - Jul 25^th, 2017 at 6:56pm	Print Post
	OK Thanks..I will remember that tip... Regards, David


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