First Standalone PCB

Forum 2005-2010 (read only) Hardware Development
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Hello,

I recently downloaded Eagle and completed my first standalone board schematic for a simple RGB Led lamp, Arduino to be preprogramed on my Diecimila board.

If anyone could spare the time to look over the schematic and make me aware of errors or even provide suggestions for a better way to do things I would greatly appreciate the input as this is my first schematic, circuit, and soon homemade PCB.

I am mostly concerned with the power supply and ATMEGA168 aspects.... I am fairly confident I can properly hook up a LED. ;D.

EDIT: See schematic below

Thanks for your time.

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Hi Todd,

This bulletin board software does not upload images so you need to link to a url that is publicly available (you could upload to a page here for example: http://www.flickr.com/)

Your image link is to a local directory on your computer so not accessible via this thread.

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O.K., thanks mem. I'll try that now.

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Took me a day but here it is.
See anything i should add, remove, change, ect.

Thanks

827×706 50.8 KB

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Great job with Eagle!

I suggest you connect the reset pin through something like a 10k resistor to +5v

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I'm not sure you have the power jack set up right; looks like you have Vin shorted to Gnd, and the "battery" position connected to the rest of your circuit. But I haven't used that type of jack, so I'm not sure...

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I'm not sure you have the power jack set up right; looks like you have Vin shorted to Gnd, and the "battery" position connected to the rest of your circuit. But I haven't used that type of jack, so I'm not sure...

i think you're right, but am not too sure either.
@personman:
i suspect the 9V- jack to open the switch so that external power will disconnect the internal power (batteries).

i'd guess:
1- GND (battery & external)
2- V+ Battery
3- V+ external

but you should double check this with a real part in hands and not rely on the eagle library part.

What kind of resonator do you plan to use? the connection does not look like for a crystal osc thats on an arduino, so i thought i'd ask :slight_smile:

kuk

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The resistor isnt needed, but RESET should definitely be connected to +5v otherwise you might get intermittent resets.

As for the power jack there are 3 connections being: +V, GND, and SWITCH. That 3rd pin is to detect when the power has been plugged in or not. Otherwise it is just tied to ground. I dont use that part myself but I think the order should be:

  1. +VIN
  2. GND
  3. GND

If you look at the part itself, it should be something like:

.___.
| |
| O |
| O
|O|

The top two should go to GND and the bottom connects to +V.... on most center positive power supplies (which is sort of a standard for arduino and related boards). YMMV, depending of course on what part you are actually using.

Cheers,
B

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As far as the power jack, i was, and still am not sure myself if it's correct but the Arduino Eagle reference file had power connected to the second pin. I will definitely look into it further prior to etching.

@ KuK:
For this one i am using a ceramic resonator.

@ bwevans:
To expand my knowledge base is the resistor not required because i will not be using this board to upload programs, i guess I'm asking if using a resistor is a preference for some people, or a requirement in other applications.

Thank you all for taking the time to give my schematic a once over and give feedback.

Personman

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To expand my knowledge base is the resistor not required because i will not be using this board to upload programs, i guess I'm asking if using a resistor is a preference for some people, or a requirement in other applications.

The resistor is needed I you want to reset the board manually or use ICSP for programming. If you are not supporting either you can just connect reset to +5v.

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O.K. cool, Thanks again mem.

I will make the revisions then all i need is some enchant and time.
I'll be sure to post a pic when I'm done. :wink:

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