Advice on Schematic

Projects General Guidance
1

Hello all! I am building a custom PCB with the ATmega2560. The schematic contains

  • Fingerprint Sensor Header x2
  • Camera Header x1
  • Logic Converter x2
  • External Clock x1
  • Reset Button x1
  • ISCP Header x1
  • Serial UART x1

I have tried my best to incorporate everything that is needed in a general schematic (besides power it is left off on purpose). I am hoping to find out if anyone notices any improvements that I might have missed? Thank you for your time it is much appreciated!

Attached is the schematic. I've also uploaded it to IMGUR: Imgur: The magic of the Internet

1518×1101 191 KB

Schematic.PNG
Schematic.PNG1518×1101 191 KB

2

I haven't studied in detail, but I guess you have already made some sort of prototype before getting to the stage of PCB design.

The only quick comment I have is about the ICSP header (I think that is what you meant by ISCP). The reset pin connection looks non-standard.

3

You don't need a 1M resistor in parallel with the quartz crystal.

4

6v6gt:
I haven't studied in detail, but I guess you have already made some sort of prototype before getting to the stage of PCB design.

The only quick comment I have is about the ICSP header (I think that is what you meant by ISCP). The reset pin connection looks non-standard.

Yes, I've made a prototype using an Arduino Mega. Everything works well on the breadboard. Thank you for the catch about ISCP! I got the reset pin connection from Jeremy Blum's book: " Exploring Arduino Tools and Techniques for Engineering Wizardry"

aarg:
You don't need a 1M resistor in parallel with the quartz crystal.

Thank you I appreciate the feedback. I am happy to hear that.