1. the size of the device is very large for a pocket device (compared to the very small functionality it offers)... I think you should somehow make a single board design
In case the appearance is deceiving, it's 6x6x2 cm in size, and appear really small to me,as shown below.
Which size is too large?
Thickness?
Or overall size?
Basically, it is limited by the sizes and clearances that i can etch at home and hand-solder.
The X-Y size is defined by the 6x6 cm size of the solar panel i use, and these aren't common enough to have much choice.
I don't see much options to thin it down - the space between the screen and the board is occupied by the battery, which would have to go somewhere else in a single board design, adding exactly the same additional thickness.
May be possible to get it at most 30% thinner with better case design and a flatter battery, but nothing like jaromir's one.
You could also use an on-board NAND flash, and eliminate the microSD slot, and communicate through a microUSB with a PC...
Ignoring for a moment how evil this option is, i don't think it's going to save any space anyway, since the size of a NAND chip and a microusb port is larger than the size of an microsd card slot.
2. The case must be more presentable, more refined.
Totally agree, case design is not on my list of skills, so i just did a bounding box with holes in it.
Well, it keeps the debris and weather out.
3. The LCD screen: I would go for a bigger screen (with better resolution), maybe a color screen...
That screen is cheap and abundant, and quite low power as well.
I'd love to get some Sharp memory or e-ink screens (
http://www.adafruit.com/category/63_150 ), but i'm on the wrong side of the planet for them.
Time ago I tried to make something similar
Nice one!
Isn't it too small for practical use?
It would be better to write more about it, though I understand it is not that simple, if English is not your first language. Short video would be fine, worth of thousand words.
Interesting idea.
So, just make a video of how it operates?
Easy to do, needs no language...
By the way, you could get more feedback after inserting popular wankwords like "arduino", "eco-whatever", "social", "art", "green-whatever", "community", "motivation", "cloud" and so on.
Read your books off the grid with this eco-friendly device using only the green solar power (red and blue gets reflected), motivating you to enlarge your imagination, reach for the clouds, and make good art?
...I'm not too good at marketeese, am i?