RPN Integer Calculator from Smart Response PE

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The surplused (eBay) device contains a microcontroller, a keyboard, and a mono graphic screen and screams to be hacked!

Ray Burne

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Visuals & Notes
07/07/2023 at 01:10 • 0 comments

Refer to https://hackaday.io/project/191791-stop-watch-x10-from-smart-response-pe/log/220989-visual-notes
I decided to not use a traditional switch. Rather, I thought having the calculator automatically turn on when picked-up and used then power-off completely when put down.
The use of a single rechargeable, LiFePO4 cell provided the space needed to construct the dummy-cell with a mercury switch.
Conversion back to 2xAA alkaline cells only takes seconds.