When autorouting in EasyEDA, the router takes my ground from my other sensor, to a resistor for a buzzer, and then goes to gnd. is this normal?
It is not uncommon, GND is GND. I usually use wider traces for GND & Vcc, but autoroute does not i guess. I never use autoroute.
I have used 36.5 mm traces
but it all goes to the same place
That is why I route by hand. You should be able to adjust the trace to what you want.
but will it work?
Will what work?
The gnd and 5v if it is passing through all components before reaching end.
It should work just fine. Run your DRC (Design Rules Check) on both the schematic and layout. It should show any problems.
Ok. I just started hand routing, but thanks. I will start auto router for all non-essential connections!
Right on!
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Also, for LED's what polarity do you put a resistor on?
And what about for a buzzer? (piezo)
The LED does not care, it is up to you and how you want it to look. The same goes for orientation but keeping chips the same direction makes assembly easier.
so it will work either polarity? on either positive on buzzer or led or negative on buzzer and led?
You used a 36 mil traces, not a mm.
I don't think so.
Run ERC check. I expect the number of errors found will be significant. Your routing does not look good overall.
How do you define an essential connection ?
Same advice as here: Arduino Shield Schematics Showcase - #14 by rsmls
You need an electronics 101 course. I'm sure something is available online; e.g. this would be a possible start: https://www.electronics-tutorials.ws/dccircuits/dcp_1.html
You asked "what polarity do you put a resistor on", a resistor is a non polarized device and can be connected in either direction. A LED is polarized and the current must flow in one direction, if it is backwards normally it will just not light.
I am sorry to say I feel you are not quite ready to start the project at this point. We have no idea of your skill set or what resources you have available to you. I would suggest you start with some of the tutorials that are on line, sorry to say some are not so good but many are very good. Start by learning the basics, you will need to control outputs as well as interpret inputs such as reading a switch, receiving a message etc. Start with the LED, they are not expensive and there is even one on most of
the Arduinos. At this point you should have also found several tutorials on basic electronics that you have gone through. You should acquire a copy of the Arduino Cookbook (Arduino Cookbook : Free Download, Borrow, and Streaming : Internet Archive) and go through that. I have no clue as to how fast you will learn this but it will probably take a few months. You can also go on line at this link: https://www.youtube.com/c/CodeBeauty There is a lot of material in small bytes (bites).
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Oh, i already have the code, just need the pcb. also i meant what pin should i connect the resistor to on the led? I know a resistor is non polarized
I ran it and corrected the mistakes, that were caused by autorouter.