|Re: uWatch kits - expression of interest.|
Message #10 Posted by Alejandro Paz (Germany) on 29 Apr 2008, 7:00 a.m.,
in response to message #1 by DaveJ
Dave, it is simply: Great !
For me that I'm struggling to build my own calculator (an HP-15 clone) it is great to see how you solved some of the problems I found myself (I made 2 prototypes):
How to power the LCD
- Your charge pump is interesting (I used a DC-DC converter and powered everything from the same 5V source).
- The keyboard: Those small keys with enough surface to be actually pressed make it more compact, avoiding the moulded plastic top of most calcs, a great idea. (I wanted moulded keys, but they can not be made so easily). And the plate above the keyboard, it is actually a PCB with cut holes, great and thin!.
- No actual cabinet, that reduces size, weight and makes the circuit visible for increased geek factor ! (together with the 2 connectors!
Did you use binary fp or BCD ? (I use BCD, for the AVR): Do not answe I found it in your description.
Edited: 29 Apr 2008, 7:04 a.m.