Pages: [1]   Go Down
Author Topic: Custom 'Duino: Stripboard ATmega644  (Read 2030 times)
0 Members and 1 Guest are viewing this topic.
B0100111001000011, USA
Offline Offline
Edison Member
*
Karma: 0
Posts: 1503
I'm confused.  Wait, maybe not..
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Well, this is my first thread in the Exhibition area, and I hope it's a good one smiley.

I caught some ATmega644s on eBay for a steal, so I just had to make something.  I've been working for a few days on putting this together;  It's not exactly pretty, but it certainly works well!

It's the ATmega644 (no, not the ATmega644p that the Sanguino uses), and is running a modified version of the Sanguino bootloader (I didn't modify it, it comes with Sanguino software).  I've tested all the I/Os, and the work.

As you can see by the second picture, I arranged most of it so I could avoid using too many wires and just bridge the connections to make it work.  I also used many component leads for short connections.  It's running at 16 MHz, and has onboard Power and Pin 0 Debug LEDs.

Without further ado, here are some pictures (the first one with labels smiley):




This soldering job isn't winning any awards, but at least I managed to get everything working the first time! smiley
Logged

North Yorkshire, UK
Offline Offline
Faraday Member
**
Karma: 104
Posts: 5531
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Nice smiley I need to do some more stripboard/protoboard arduinos...

Great that it worked first time for you. I now have 2 boards with either the 644 or 644P (in DIP and SMD respectively) and they are great to have the extra hardware serial and the extra digital pins. I didn't make either of them though (well I put one together - duino644). The extra space is an added bonus but so far none of my projects have gone over the 328s 32k (30k useable), most of them are under 20k  smiley-wink

Mowcius
Logged

Netherlands
Offline Offline
Full Member
***
Karma: 0
Posts: 132
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Very nice smiley. Looks like something I would be able to pull of, which is inspiring because that's not the case with everything I see around here smiley-wink.
Logged

B0100111001000011, USA
Offline Offline
Edison Member
*
Karma: 0
Posts: 1503
I'm confused.  Wait, maybe not..
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Thanks guys!

Yeah, it wasn't too difficult, but an important step is planning.  You need to lay everything out on the board, make sure it will fit, and visualize the wiring.  If you don't think you can wire through a small gap, or are afraid you'd accidentally bridge some connections, try rearranging until you get a manageable structure.

I made a few mistakes in my design:
  • The chip is between components, so it's very difficult to remove
  • I forgot to connect the external power's ground, so that won't work until I do
  • I need to clean off the excess flux.  I read somewhere that it's a little conductive, like water, and can short things out.  I've discovered that even with the jumper removed, the power LED is still glowing dimly, telling me that this is true.
[/list]
Logged

Netherlands
Offline Offline
Full Member
***
Karma: 0
Posts: 132
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Don't you need a crystal? (Newbie question smiley-wink)
Logged

MD, USA
Offline Offline
God Member
*****
Karma: 2
Posts: 663
A jack of all trades and a master of none!
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Great work. The solder job is pretty good for a perf board.

If i'm not mistaking the little green box below the reset button is the crystal. Not all crystals are packaged in a metal casing. I have a few 455kHz crystals that have a yellow/orange plastic packaging.

Logged

SE USA
Offline Offline
Faraday Member
**
Karma: 41
Posts: 3783
@ssh0le
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Don't you need a crystal? (Newbie question Wink)

the brown dot at the bottom of the socket is a resonator, which is doing the job of the crystal and the 2 capacitors

Good work btw TchnclFl
Logged


0
Offline Offline
Edison Member
*
Karma: 8
Posts: 1411
Arduino rocks
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Be careful with placing ICs on the carpet, that gets lots of static electricity which may damage the chips.
Logged

B0100111001000011, USA
Offline Offline
Edison Member
*
Karma: 0
Posts: 1503
I'm confused.  Wait, maybe not..
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Great work.

Thanks! smiley

Quote
If i'm not mistaking the little green box below the reset button is the crystal.

Actually, that's a green LED.  But you're right, they're not standardized.

Quote
Good work btw TchnclFl

Thank you ;D.

Quote
Be careful with placing ICs on the carpet, that gets lots of static electricity which may damage the chips.

Wow I never even thought of that, thanks for the tip!
Logged

Pages: [1]   Go Up
Jump to: