Regular Member
Joined: 27/09/2022
Location: CanadaPosts: 64
| Posted: 04:38pm 28 Mar 2024 |
I think this is an admirable challenge but adding an external keyboard will make this quite large. If this is for your own use and enjoyment then that is great. The challenge is keeping the cost reasonable to get something you can't get by other commercial means.
I have a few HP calculators HP48G, 35S, and their keyboards are quite nice but the display is limited. Using button keys are quite effective for a project like the following
https://obsolescence.wixsite.com/obsolescence/kim-uno-summary-c1uuh
https://obsolescenceguaranteed.blogspot.com/2022/12/the-2-apple-1.html
where you are emulating a Computer with a limited display.
I also use a HP48 app on my smart phone(all on screen keys and display). The disadvantage is the high cost of the phone to get the good display(and portability). One app that I remember using was on a Palm Pilot that was interactive and could draw curves on the screen, but you could enter your own formulas in algebraic notation.
I have used the 3.97 inch IPS display on the STMF4 board that Disco4now is supporting. It has the 800x480 display so might be a better display to combine the keyboard with display that could keep the size down.
It appears from what you indicated your program environment for the F77 is using the Arduino platform so it might be possible to port that to the STM rather than the RP2040.
At any rate I am enjoying following the progress and I will be interested to see how it develops.
Edited 2024-03-29 04:06 by okwatts