RPN scientific Casio Calc watch...



#2

Whilst playing with my uWatch, and thinking about the Phoenix 35S project I wondered would it be possible to modify a current Casio 4 function calculator watch into a scientific calculator version.



So I got myself a cheap Casio CA-56 calc watch and took it apart.



It actually looks quite do-able. Both the LCD and keypad are held in place by a plastic mould, and both are connected via zebra strips.
The PCB is 0.5mm and looks to be easily duplicated. With enough room for a small thin LCC package.


Front panel would be an issue though.



Comments about the pointlessness of such a project invited! :->

Dave.


#3

Quote:
Comments about the pointlessness of such a project invited! :->

Dave:

If you want a pointless watch project then please do a refit of the Casio AT-550G. This is an amazing watch from the early 1980's. It has both an analog and a digital display. It is also a 4-function calculator.

Nothing special about that you say? Well, this watch does _not_ have a keyboard. You draw the digits and math functions on the face of the watch with your finger!

-- Rich


#4

Quote:

Dave:

If you want a pointless watch project then please do a refit of the Casio AT-550G. This is an amazing watch from the early 1980's. It has both an analog and a digital display. It is also a 4-function calculator.

Nothing special about that you say? Well, this watch does _not_ have a keyboard. You draw the digits and math functions on the face of the watch with your finger!


Thanks, I didn't know about that watch, I'll have to do a Google...



I've already thought of a touch screen version, and a voice recognition version too.


Somehow though I don't think voice recognition would be very popular...

Dave.


#5

I use a watch to represent the time. I have long been an accuracy freak. Not content with setting a watch I use the watches equipped to receive the NIST time transmissions. The Casio simply sets itself, but it is solar rechargeable. The other from Zeit Germany not only corrects itself, but measures the needed rate corrections and applies them digitally. When out of the country I simply reset the time zone and it stays spot on for a month. I am disappointed in the timekeeping ability of the 50G, I think I'll keep my watch. The Casio goes to sleep, with a blank face if left in the dark for a bit. Sam


#6

Quote:
I use a watch to represent the time. I have long been an accuracy freak. Not content with setting a watch I use the watches equipped to receive the NIST time transmissions. The Casio simply sets itself, but it is solar rechargeable. The other from Zeit Germany not only corrects itself, but measures the needed rate corrections and applies them digitally. When out of the country I simply reset the time zone and it stays spot on for a month. I am disappointed in the timekeeping ability of the 50G, I think I'll keep my watch. The Casio goes to sleep, with a blank face if left in the dark for a bit. Sam

Then you'll be pleased to know that the uWatch allows the user to program in a value to adjust the clock rate. Tweak to your hearts content!

It's going to vary with temperature though, so best to leave the watch on your wrist to keep the temp fairly stable.



Perhaps I should have added a high stability TXCO oscillator though. It's only got a regular watch crystal at present :-(

Dave.

#7

Quote:
You draw the digits and math functions on the face of the watch with your finger!

And Richard really does mean "draw". This isn't one of the ones that has specific rectangles to touch for the digits and symbols. Rather, it recognizes strokes in a manner similar to "Graffiti" on PalmOS.

Pretty f*&#ing amazing for a watch from 1983 or so, IMNSHO.

#8

Quote:
Whilst playing with my uWatch, and thinking about the Phoenix 35S project ...

Any news about the latter?

#9

Quote:
Any news about the latter?

Not from my side I'm afraid.

I was thinking about a LED version for a while there, I think that would be really nice.

Jeff has done a lot of work that started
here




He has done some excellent reverse engineering to make DXF files of the existing PCB and mounting holes etc, so it's relatively easy for anyone at this point to make a new PCB for the 35S.

Dave.


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