Hello all! Is this correct? I want to use a 3.7V battery that should supply a buzzer, a sensor module and the processor. The circuit functions when the switch is on, turning on the led and supplying the microcontroller with 3.7V through VCC. I’m not sure if i should use 100n coupling capacitor or if it works this way. A voltage regulator is not needed.
With the release of Kicad V6 this site has been getting quite busy and we are getting a little more strict about restricting the content to Kicad related stuff.
Given the question you are asking I think this site will be very informative and more suited to what you are looking for at this point. (Too your point though. Needed? Probably not.) Good luck and enjoy the ride. 
https://www.eevblog.com/forum/index.php
You might also consider:
Many are entering electronics through this medium and the site was also a great place for a lot of elementary electronics knowledge in general.
Sorry but I’m not a beginner. And second of all, I didn’t know that here should be posted only software related questions. Always that one reply that sparks the joy. Thank you however.
While eeschema is a nice schematic capture and editing tool which can be used without any intention to produce a PCB, your question is one of circuit design, which is outside of the scope of this forum, which concentrates on the KiCad software, otherwise the forum would be unmanageable.
Besides eevblog, you might also consider Electrical Engineering Stack Exchange for your question.
From my end I think the 220 ohms resistor should be connected between the ground and the LED and not where it is currently connected
Technically, it doesn’t really matter WHICH way around you put the LED & resistor… often it comes down to convenience… eg if you need to cross several tracks, you can neatly do that with the resistor.
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‘Technically’ - it’s a broad term and there are technical reasons that the way of connecting matters (at least I think so).
When in DIN rail case I place LED instead of one terminal block screw I assume that ESD from user finger can reach that LED so in such case I always connect LED directly to GND and rotate it such way so that grounded pin be the first one found by ESD. I also construct that LED driving circuit that way that even ESD reach its second leg it will be limited and blocked (serial diode) to not reach my VCC.
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