VS Arduino - Serial doesn't work in added empty c and h file

May 12^th, 2025 at 7:01am (UTC)

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VS Arduino › › › Serial doesn't work in added empty c and h file

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Serial doesn't work in added empty c and h file (Read 1042 times)

andi0000085 Newbies Offline Posts: 1 Joined: Oct 27^th, 2019	Serial doesn't work in added empty c and h file Oct 27^th, 2019 at 9:01pm	Print Post
	Hi, I want to split up the functionality in several files. So I added an "empty arduino c and h file" and added a simple Serial.println command in a function. This function I will call in the main.ino file and I always get the error "SerialUSB" undeclared. What do I have to include to get the Serial working? Thanks Error: Code (C++) test.c: In function printTest variant.h: 204:37: error: 'SerialUSB' undeclared (first use in this function); did you mean 'SerialGSM'? #define Serial SerialUSB test.c:9: note in expansion of macro Serial Serial.println("Hello3")


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Tim@Visual Micro Administrator Offline Posts: 12187 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Serial doesn't work in added empty c and h file Reply #1 - Oct 28^th, 2019 at 11:30am	Print Post
	use .cpp and .h not .c and .h. Ensure you add the #include "Arduino.h" to the code


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