how can i use a Arduino Pro Mini and HC12 for a schematic drawing.
i am unable to get any in the system.
Please read:
https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a in particular the section headed:
Include relevant information to demonstrate or illustrate your question or point
and the documents that it links to in particular:
2.3) How to create findable footprints and searchable symbols Open the Editor > Library then search for HC-12 (not HC12) and find:
also search for Arduino Pro Mini and find:
Don't forget to check all symbols and footprints against the original manufacturers datasheets:
http://www.elecrow.com/download/HC-12.pdf Sorry but I do not know where there is a properly dimensioned drawing for the Arduino Pro Mini.
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Brand new interactions and interfaces.
Smooth support for design sizes of over 3W
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More rigorous design constraints, more
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For enterprises, more professional users.
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The process supports design scales of 300
devices or 1000 pads.
Supports simple circuit simulation.
For students, teachers, creators.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Please read:
https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a
in particular the section headed:
Include relevant information to demonstrate or illustrate your question or point
and the documents that it links to in particular:
2.3) How to create findable footprints and searchable symbols
Open the Editor > Library then search for HC-12 (not HC12) and find:
also search for Arduino Pro Mini and find:
Don't forget to check all symbols and footprints against the original manufacturers datasheets:
http://www.elecrow.com/download/HC-12.pdf
Sorry but I do not know where there is a properly dimensioned drawing for the Arduino Pro Mini.