Hi,
I would really appreciate if I could get a review and suggestions for my schematic design containing ATmega328p IC, USB to UART (CH340G), some basic interfaces like button, RGB LED's, Buzzer etc.
I am attaching the Schematic Design.pdf
Thanks in advance!

 

REVIEW:
It would take me half a day to figure out what is connected to what and whether it is correct in your diagram, even if I knew what it was supposed to do. On its own, a diagram like that is more like a wiring list than a functional diagram. There is no information indicating the flow of data and control.
SUGGESTION:
The would convey much more information and be easier to comprehend if it was broken down into interconnected functional circuits like the attached:
Regards, Keith

 

Thanks @Keith for the reply.
I have already broken down my schematic into functional blocks. But, can you help me with review of USB to UART part as I am using CH340G for the first time.
Thanks.

 

Thanks @Keith for the reply.
I have already broken down my schematic into functional blocks. But, can you help me with review of USB to UART part as I am using CH340G for the first time.
Thanks.

I have not used the CH340G but if you have connected it correctly, the functionality will depend entirely on the bootloader you are using.
Keith

 

I have not used the CH340G but if you have connected it correctly, the functionality will depend entirely on the bootloader you are using.
Keith

Okay. Thank you.

 

Hi,
I would really appreciate if I could get a review and suggestions for my schematic design containing ATmega328p IC, USB to UART (CH340G), some basic interfaces like button, RGB LED's, Buzzer etc.
I am attaching the Schematic Design.pdf
Thanks in advance!

It looks ok
advice:
replace the diode (polarity protector) with a fet (lower resistance and dropout).
place ferrits in mpu power lines.
place filters in ref lines.
place an auto fuse in the USB power line.
Picbuster.

 

It looks ok
advice:
replace the diode (polarity protector) with a fet (lower resistance and dropout).
place ferrits in mpu power lines.
place filters in ref lines.
place an auto fuse in the USB power line.
Picbuster.

Thanks @Picbuster for the advice. Can you please tell me the purpose for placing a fuse or polyfuse on USB power lines?.

 

Thanks @Picbuster for the advice. Can you please tell me the purpose for placing a fuse or polyfuse on USB power lines?.

A shortcut in that part of the (external) system will not bring the total to a halt.
I always use 200mA assuming that power supply can handle it.
Picbuster

 

A shortcut in that part of the (external) system will not bring the total to a halt.
I always use 200mA assuming that power supply can handle it.
Picbuster

Thanks for the advice.
My query is solved.