Transforming a schema into a pcb

[1.21Gigawatts]

@juleiin

Yes it is okay for what I need.

You have actually applied 5V through a 5K resistor using the LEDs you intend to use? This will result in less than 1ma through the LED.

@juleiin

but is there any tool to draw the contours and draw landmarks to set the position of the components

FreeCad is the MCad of choice for most on people on this forum.

Mechanical alignment in Pcbnew

Designing a PCB with accurate mechanical position of components is critical to aligning with mount holes, front panels & heatsinks etc… Using CorelDrawX4 as my mechCAD, it has guidelines to assist placing graphic objects accurately, The method below of using “guidelines” in Pcbnew . You cant snap specifically to the guidelines (maybe in a future version) but placing vias & components is visually simple & accurate. Mechanical CAD import in Kicad: Kicad imports older DXF version & this has so…

[Rene_Poschl]

@juleiin

But I would like you to explain how to use a transistor because I never did…

Something like this could do the trick.
R1 might be a bit overkill. (with it and R2 you could divide down the voltage at the gate of Q1. The bss205 i typically use can handle gate voltages of 12V so for it you would not need R1 at all. (R1 can be 0 ohm in that case.))

R2 is there to reliably turn off the transistor while your micro controller (uC) has not yet initialized its pins. (might not really be necessary in your application.)

[Piotr]

@1.21Gigawatts

This will result in less than 1ma through the LED.

I only asked not argue as recently I used bright green LEDs for which I have to give 0.5mA to make them not be too bright.

[juleiin]

I Tried it and the brightness was ok to me.

I tried to import a dxf file but nothing appears.

And is there a possibility to lock some components and then auto-route while letting the possibility for other components to be placed anywhere ?

Thanks

[PCB_Wiz]

@juleiin

does it have to be without crossing lines

The tie dots you can see show the connections. Generally avoided is a tie dot on a cross ( ie T is ok) but you have avoided that.

@juleiin

Cleaner ?

Cleaner is always good.
Extra corners make it harder to scan, and crazy loops (!) like on the bottom left LEDs are easily avoided.
Where lines are similar, (as in those 3 leds) run them adjacent parallel, and use the saved space to spread the others to clearer scan.
You can do quite a bit of corner-reduction on that SCH

@juleiin

Do we care about the positions of the components ?

Not really, but placement ‘broadly similar’ to the PCB design makes things easier to find.
Usually that means in small clusters of parts, the numbering order is similar.
Tends to happen naturally, but can need some manual help…

[paulvdh]

KiCad itself does not care about the “neatness” of the schematic.
Humans do, but some care more then others.

This is probably one of your first KiCad projects.
If you are OK with how the schematic looks and just want to make a PCB, then go on with it.

If you want to make comprehensible schematics that you and others can easily read / modify / maintain, then learn to use GND / Vcc symbols and local labels.

Euhm, do you have a connector as a power entry point, or are you suing the power from the arduino board?