Arduino Forum

Development => Other Hardware Development => Topic started by: JeonLab on May 29, 2011, 06:14 pm

Title: Introducing new JeonLab mini v1.3
Post by: JeonLab on May 29, 2011, 06:14 pm
Since I introduced the JeonLab mini v1.0 (http://jeonlab.wordpress.com/2011/03/16/jeonlab-mini-v1-0-pcb/), I thought I could make it smaller and breadboard friendly.  So I designed a new version.  

This is yet another minimalist Arduino compatible board which means there are only core components: ATmega328p with Arduino bootloader, resistors for the reset pins and LEDs (power and d13), and a capacitor for auto-reset when you upload your sketch through external FTDI interface.  

I found there is enough space for resistors or capacitors between the PCB bottom and the breadboard because of the height of the header plastic part.  So I arranged those 3 resistors and a capacitor at the bottom layer so that only ATmega328p, ceramic resonator, and 2 LEDs can be compactly arranged on the top layer.  This fits very well on a mini breadboard.

It looks like this.
(http://farm4.static.flickr.com/3169/5763371317_0a2bed2be4.jpg) (http://www.flickr.com/photos/7746495@N07/5763371317/)
JeonLab mini v1.3 assembled 1 (http://www.flickr.com/photos/7746495@N07/5763371317/) by DS2DYS (http://www.flickr.com/people/7746495@N07/), on Flickr

An example with external power (+5V, but it runs at about 3-5V).
(http://farm6.static.flickr.com/5224/5763371395_568ffeb6e7.jpg) (http://www.flickr.com/photos/7746495@N07/5763371395/)
JeonLab mini v1.3 testing (http://www.flickr.com/photos/7746495@N07/5763371395/) by DS2DYS (http://www.flickr.com/people/7746495@N07/), on Flickr

You can upload your sketch with FTDI breakout board (e.g. Sparkfun).
(http://farm4.static.flickr.com/3448/5763919200_37e10fde8a.jpg) (http://www.flickr.com/photos/7746495@N07/5763919200/)
JeonLab mini v1.3 on bread board with FTDI (http://www.flickr.com/photos/7746495@N07/5763919200/) by DS2DYS (http://www.flickr.com/people/7746495@N07/), on Flickr

Its pin arrangement:
(http://farm3.static.flickr.com/2703/5765561096_37f8683cb5.jpg) (http://www.flickr.com/photos/7746495@N07/5765561096/)
JeonLab mini 1.3 pins (http://www.flickr.com/photos/7746495@N07/5765561096/) by DS2DYS (http://www.flickr.com/people/7746495@N07/), on Flickr

More detail and examples will be posted on my blog (http://jeonlab.wordpress.com/2011/05/27/new-jeonlab-mini-v1-3/).

Thanks.
Title: Re: Introducing new JeonLab mini v1.3
Post by: wortelsoft on Jun 01, 2011, 06:59 pm
Nice one!

Very handy for breadboard usage.

Title: Re: Introducing new JeonLab mini v1.3
Post by: CrossRoads on Jun 01, 2011, 07:09 pm
Why not use wirewarap header type sockets with Rs & Cs mounted between the DIP legs so the assembly can be 3/10 wide instead of 5/10?
Got me curious as to if that would fit or not now.
Title: Re: Introducing new JeonLab mini v1.3
Post by: JeonLab on Jun 01, 2011, 07:11 pm

Nice one!

Thank you!


Very handy for breadboard usage.

Yes, indeed!  I'm quite satisfied with this design. :-)
Title: Re: Introducing new JeonLab mini v1.3
Post by: JeonLab on Jun 01, 2011, 07:18 pm

Why not use wirewarap header type sockets with Rs & Cs mounted between the DIP legs so the assembly can be 3/10 wide instead of 5/10?
Got me curious as to if that would fit or not now.

That (wire-wrap DIP socket with long legs) was first thing came to my mind when I designed this, but they were quite expensive (the cheapest one I could find from Digikey was over $5.00).  I wanted to make it inexpensive and ended up with this design.  If you want 3/10, there is so called one-chip Arduino I remember.

Thanks.
Title: Re: Introducing new JeonLab mini v1.3
Post by: CrossRoads on Jun 01, 2011, 08:11 pm
I was thinking of the pins that I found at MarcoSpecialties, and also Gravitech.us (shorter legs).
Something like $1.90 for 20 pins, or maybe 32. I have used a lot of them as sockets for promini's with "interconnect" pins added as the promini leads (also from gravitech.us).

One-chip Arduino - the Solarbotic Ardweeny, with the components mounted on a board installed on  the chips back.