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  • No problems. Compile to check your code.

        


        

          

            
            
            

              
            

            

            
            
            
            
            
            

            
            
          

          

          

            
            
            
          

        


        

          

            

            

            
            
            
          

          
        


        

          

            Running
            
            
            

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    Compile settings
    
      
    Code is compiled for free on GitHub Actions (about 15 s – 2 min per build), or on a compile server you host (seconds).
    
      
    
        GitHub Actions (free)
        
        
        
    
          Create a fine-grained token:
          Repository access → Only select repositories → that repository; Permissions → Actions and Contents: Read and write.
          The token is stored only in this browser. Other people: fork the repo and use your fork.
        
    
      
    
      
    
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    Add a board
    
      
      
      
      
    
        
        
      
    
      
    Find FQBNs with arduino-cli board listall or in the core's boards.txt. Custom boards compile on GitHub Actions; the core is installed and cached on first use.