• Day 5 : Ext. UART & some GFXs

    Franck GALLIAT • 03/11/2023 at 17:56 • 0 comments

    Hi, for today we have ...

    I started to use my Aux UART (for DOWNLoad / UPLoad binary files w/ a computer), keeping UsbUART to debug/program calculator native code.

    Then I re-used my good old .BP4 file format (for 16greyshades pictures) to display pictures on SSD1322 (256x64x4bpp display)

  • Internal Diagram

    Franck GALLIAT • 02/09/2023 at 17:23 • 0 comments

    The inner diagram with both MCUs (AT328P / RP2040) & both power system

  • Day4 : Battery Party

    Franck GALLIAT • 02/09/2023 at 16:21 • 0 comments

    Hi, today I finally mounted a battery pack, it's a rechargable NI-MH 4xAA 1.2v.

    It provide a 4.8v @2400mAh, enough to power the 2x screens, 2x MCUs, keyboard ...

    so now, system can be both power by USB connector / 4.8v battery

  • Day3 : enclosure is ready

    Franck GALLIAT • 01/28/2023 at 19:37 • 0 comments

    January 2023, 25th : 

    The build is ready to be enclosed. there is less room that I imagined.

    I had to forget a lot of ideas such as mounting MCU on removable cards to change the CALC behavior (WiFi, dumb terminal, calculator....)

  • Day2 : unsoldering & experiments

    Franck GALLIAT • 01/28/2023 at 19:34 • 0 comments

    During January 2023 :

    unsoldering much as possible original parts

    & start to experiment existing wirings..

  • Day1 : unboxing

    Franck GALLIAT • 01/28/2023 at 19:31 • 0 comments

    December 2022, 31th

    received the non-working Unit in pretty good looking state.

    I still work on software part w/o be sure of screen size, keyboard map... that I will be able to re-use.