I found a blog that show me how to make an Arduino alarm but i can't understand the schematic https://cdn.instructables.com/ORIG/FGV/4M3N/IW6PLRU0/FGV4M3NIW6PLRU0.pdf because I just started using arduino. Can some of you show me the schematic that i can understand perhaps using tinkercad. Thanks.
No. That link is to a perfectly good and completely unambiguous schematic.
If there are specific items or symbols that you do no understand, ask about them.
But srsly, learn how to read a schematic! It is the language of communication for electronic designs.
You can probably find information on the internets that will match your learning style.
a7
alto777:
But srsly, learn how to read a schematic!
To that end: Electronic Circuit Symbols - Components and Schematic Diagram Symbols
And many others besides.
alto777:
No. That link is to a perfectly good and completely unambiguous schematic.
I agree, but it is the type that lacks component values because it is accompanied by a BOM (bill of materials). You need to go there to identify some of the components.
Yes, a decent-looking schematic except for the bad foul-up with R1 and R2. 
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