Hello everyone.
I'm making my first electronics project that will (hopefully) end up as a PCB. It's a Serial to Ethernet Gateway that uses an Atmega328p (Arduino) and a WizNet WIZ811MJ (W5100) Ethernet board. I was hoping to get some review and critique of my circuit before I go and buy parts.
Here is some info on it...
I expect about 12VDC as input with regulators providing 5V and 3.3V on the board. The Atmega will have a dip switch for config settings and LED's for status. There is also a MAX232 for RS-232 level conversion.
I believe that I have everything wired and selected correctly, but since this is my first try at producing a PCB, I'd like a review.
I'm a little concerned that I might have selected the wrong cap values or types, so please let me know.
Also, for the WIZ811MJ board, there are 3 4.7k resistors pulling up unused inputs. Could I take the three unused inputs, tie them together, and then connect them to a single 10k resistor and then to 3.3V? Would that also work?
Finally, I wasn't sure, but do I need to add some kind of cap from the Atmega chip's reset pin to ground? I believe that this might be unneeded, but I wasn't sure.
Thanks for any help!
I'm making my first electronics project that will (hopefully) end up as a PCB. It's a Serial to Ethernet Gateway that uses an Atmega328p (Arduino) and a WizNet WIZ811MJ (W5100) Ethernet board. I was hoping to get some review and critique of my circuit before I go and buy parts.
Here is some info on it...
I expect about 12VDC as input with regulators providing 5V and 3.3V on the board. The Atmega will have a dip switch for config settings and LED's for status. There is also a MAX232 for RS-232 level conversion.
I believe that I have everything wired and selected correctly, but since this is my first try at producing a PCB, I'd like a review.
I'm a little concerned that I might have selected the wrong cap values or types, so please let me know.
Also, for the WIZ811MJ board, there are 3 4.7k resistors pulling up unused inputs. Could I take the three unused inputs, tie them together, and then connect them to a single 10k resistor and then to 3.3V? Would that also work?
Finally, I wasn't sure, but do I need to add some kind of cap from the Atmega chip's reset pin to ground? I believe that this might be unneeded, but I wasn't sure.
Thanks for any help!
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