This time I try to make the SIO2SD in micro version, and I like to think that I succeeded! As is, the size is identical to that of SDrive micro.
As regards the construction I have followed closely the design of original "version 2" schematic from SIO2SD wiki, but redesigned to a smaller pcb with smd parts.
The sd socket is push-push type, and the lcd screen is green backlighted with 2x16 characters mini display. Sorry for the green color, but is the only one I found available in this dimension, and at this price also!
Now the heart of the device the ATmega32A microcontroller, is the latest and optimized one with minimal consumption against the previous ATmega32-16. You can read for the migrating in the above link.
The 5 button have the same place and meaning as the original SIO2SD in its wiki page.
Internally a ISP connector exist for any update with a programmer. Alternative can be the same with the procedure of "Shift" + "K3" buttons.
The pull up resistor for the maximum 127Kb/s high speed, exist also in circuit.
The device is programmed with the latest firmware 3.1RC2, and work perfect with 3.5 fast loader.
Now about the plastic enclosure.
Because of the lcd display, isn't possible for me with conventional tools to make the hole. The result at least in my eyes is not acceptable, and of course, besides taking a long time to make. For that I addressed this in a local company with a cnc router, and which to arrive at a reasonable price, need to make minimum 50 enclosures.
If you do like what you see and want to order one, as we all understand to be able to order materials should have at least 40 preorders...
The final price for this number of devices can be at 50 euros for each one.
Last the plastic enclosure of device shown in the photos, is hand made and used as a Demo. For that reason have some imperfection in the cut of the hole for the lcd. The final one if ever exist, will be flawless cut for all holes from professional cnc router.
Thank you all for your time.
Edited by santosp, Sun Apr 29, 2012 12:24 AM.