Arduino Forum

Development => Other Hardware Development => Topic started by: tormentor on Nov 27, 2011, 01:54 am

Title: Single-sided Arduino-Leonardo board
Post by: tormentor on Nov 27, 2011, 01:54 am
  Hello. Here is my attempt to create single-sided Arduino-Leonardo clone, with possibility of DIY-photoresist production. Designed in KiCAD. Dual LDOs (3.3V and 5V), additional connectors for RS232, I2C, SPI/ISP.
  Project repository: https://bitbucket.org/edartuz/ul_arduino_leonardo
Title: Re: Single-sided Arduino-Leonardo board
Post by: tormentor on Nov 29, 2011, 02:07 pm
Almost done, used 16 jumper wires:
Title: Re: Single-sided Arduino-Leonardo board
Post by: graynomad on Nov 29, 2011, 03:53 pm
Quote
used 16 jumper wires:

C'mon, you can do better :)

Where did you get a schematic to copy, I thought they weren't released yet.

______
Rob
Title: Re: Single-sided Arduino-Leonardo board
Post by: tormentor on Nov 29, 2011, 04:14 pm
Quote
Where did you get a schematic to copy, I thought they weren't released yet

most info here:
http://arduino.cc/forum/index.php/topic,78781.180.html
http://arduino.cc/forum/index.php?topic=78639.0

I don't think its far from official design, so final changes will be small
Title: Re: Single-sided Arduino-Leonardo board
Post by: graynomad on Nov 29, 2011, 04:26 pm
OK, no wonder I didn't see it, my Spanish is a little weak so I tend to skip that forum :)

______
Rob
Title: Re: Single-sided Arduino-Leonardo board
Post by: 32teeth on Nov 30, 2011, 10:37 pm

Almost done, used 16 jumper wires:


ISP header for bootloader?
Title: Re: Single-sided Arduino-Leonardo board
Post by: tormentor on Nov 30, 2011, 10:52 pm
yes
Title: Re: Single-sided Arduino-Leonardo board
Post by: westfw on Dec 01, 2011, 07:04 am
I think you should move your traces further apart.  In most cases (ie the traces going to the digital IO pins), you have plenty of room...
Title: Re: Single-sided Arduino-Leonardo board
Post by: CrossRoads on Dec 01, 2011, 07:11 am
The 2nd link has built in google translate (click the UK flag)
Title: Re: Single-sided Arduino-Leonardo board
Post by: fm on Dec 01, 2011, 08:53 pm
Hi chaps,

since you've been following the Spanish thread I thought I would share with you the last events. The boards have arrived and are going to be beta tested by the vinciDuino team.

The boards look great. Currently waiting for components to arrive.

You can find all the information about the board: https://bitbucket.org/fmalpartida/vinciduino/wiki/Home (https://bitbucket.org/fmalpartida/vinciduino/wiki/Home)
Released under CC SA-BY.

I will keep you posted.

Title: Re: Single-sided Arduino-Leonardo board
Post by: CrossRoads on Dec 02, 2011, 03:00 am
Looks nice.
Title: Re: Single-sided Arduino-Leonardo board
Post by: frank26080115 on Dec 03, 2011, 08:26 am
please use thermal pads on the ground plane
Title: Re: Single-sided Arduino-Leonardo board
Post by: CrossRoads on Dec 03, 2011, 02:38 pm
??frank ?? Looks like its covered with ground plane on both sides.

Maybe could have used some more around the regulator, IC2.
Title: Re: Single-sided Arduino-Leonardo board
Post by: frank26080115 on Dec 03, 2011, 09:07 pm

??frank ?? Looks like its covered with ground plane on both sides.

Maybe could have used some more around the regulator, IC2.


http://en.wikipedia.org/wiki/Thermal_pad_(electronics)
Title: Re: Single-sided Arduino-Leonardo board
Post by: fm on Dec 03, 2011, 11:17 pm
Thanks CrossRoads.
Title: Re: Single-sided Arduino-Leonardo board
Post by: CrossRoads on Dec 04, 2011, 12:12 am
Not getting what you think is the problem frank.
Title: Re: Single-sided Arduino-Leonardo board
Post by: fm on Dec 05, 2011, 06:57 pm
The vinciDuino board is up and running beautifully:
- UART working
- USB working
- I2C operational
- ISP
- digital IO, well I've only tested D13.
- all supplies are good (external unregulated, USB, and UART).

Little picture from the vinciDuino board saying its first hello world!
Title: Re: Single-sided Arduino-Leonardo board
Post by: tormentor on Apr 09, 2012, 08:31 pm
...
Title: Re: Single-sided Arduino-Leonardo board
Post by: Chagrin on Apr 10, 2012, 01:39 pm

Not getting what you think is the problem frank.


The ATMega32U4 has a thermal pad on its underside.

Oddly the datasheet makes no reference to it whatsoever except for the footprint drawing which shows that it is present.
Title: Re: Single-sided Arduino-Leonardo board
Post by: CrossRoads on Apr 10, 2012, 10:12 pm
http://www.atmel.com/Images/7766S.pdf
See sections 7.2 & 7.1.

The exposed pad only applies to the QFN44 (quad flat no-lead package) and not the TQFP44 (thin profile plastic quad flat package) as used on the previous post.