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You should leave enough space between pins. Many premade schematic symbols pack the device pins as
tightly as possible.
While this minimizes the area of a symbol, it also
makes the circuit more difficult to read as you have
connections converging fr
A Schematic Diagram is intended to be the documentation of a circuit. So I highly recommend including any simple equations that may be used. This includes LED current calculations, filter corner frequencies, etc.
If the circuit yo use is copied from a datasheet, you can put the reference on the schematic so that someone else can check it later.
You should indicate UART direction.
Since UART lines are not always clear which way they
are flowing, add a little arrow next to each line to
show the direction is cecessary.
What you need to remember is that do not pack too much stuff on a page. People may start
complaining if your schematic is fourty pages but the
alternative is having rats nest of confusing wiring
between parts. Break up the schematic into logical
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