Gerber PCB for Arduino UNO and NANO

[x7l7j8cc]

Dont know if someone will be interested, but i designed 2 PCB for both Arduino UNO and NANO.
This is my first time doing this. Hoping will be appreciated.

Note: Any suggestion are Welcome.

Preview (i previewed the PCB in Black Color):
PSXMemCardUino for UNOr3
PSXMemCardUino for NANO

Downloads:
Gerber_PCB_PSXMemCardUino_2021-03-29.zip
Gerber_PCB_PSXMemCardUino_NANO_2021-03-29.zip

[Pro-Tweaker]

Hello,

Thank you very much for this design.

Isn't the MP1584 a step-down regulator ? How can it make 7.5v with 5v input ?
I may not understand correctly this part of the design, only analysed the images for now.

Is it possible to include the BOM (espacially the custom mp1584 board and the switches) ?

Thank you,

PT

[x7l7j8cc]

The MP1584 is a Step-Up/Down Regulator so you can put an input voltage of 4.5v to 28v and regulate by the Trimmer to any voltage between 0.8v to 20v with a max Current of 3A.
You can buy it on amazon at (on my country) 8.99€ for 6pz, the precise model is MP1584EN.

R1 and R2 are resistance, and the correct value are written on the board itself (you can see it on the preview image), R1 is 100ohm and R2 is 470ohm.
for the UNO board you can select the voltage for that pin buy putting a 2-DIP Switch or by shorting the voltage you want with a jumper wire or just leaving it open (if not necessary).

The PCB connect to the Arduino with Pin Header (for NANO you can choose male or female ):
-- for UNO just solder the Male Pin Header, and connect Arduino UNO and this Shield by pin headers.
-- for NANO you have 2 choices:
(A) solder the Male (or female) Header on the NANO and the Female (or Male) to the Board (example: Male Header on Arduino and Female on Board OR Female Header on Arduino and Male on Baord.
(B) solder a male Header on the Board, and then solder the Arduino to that pins (cut the extra long pin).

I hope that I have explained myself well :)

[Pro-Tweaker]

Thank you very much for the extra details.

But for If you read the documentation of the chip it says:

The MP1584 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET.

Also here:

This DC-DC step down module is based on MP1584EN chip, this is capable of driving a 3 A load and converts input voltage between 4.5 V to 28 V into smaller voltage between 0.8 V to 20 V. 

Are you sure about that part ?

Thanks,

PT

[x7l7j8cc]

Ive attached an image of the product, the trimmer is used to step-up or step-down the voltage.
i think they used the description of a similar product.
and in the note you copied there is:

and converts input voltage between 4.5 V to 28 V into smaller voltage between 0.8 V to 20 V.

[Pro-Tweaker]

I also found this image:

Very confusing indeed,