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Day 5 : Ext. UART & some GFXs
03/11/2023 at 17:56 • 0 commentsHi, 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)
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Internal Diagram
02/09/2023 at 17:23 • 0 commentsThe inner diagram with both MCUs (AT328P / RP2040) & both power system
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Day4 : Battery Party
02/09/2023 at 16:21 • 0 commentsHi, 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
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Day3 : enclosure is ready
01/28/2023 at 19:37 • 0 commentsJanuary 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....)
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Day2 : unsoldering & experiments
01/28/2023 at 19:34 • 0 commentsDuring January 2023 :
unsoldering much as possible original parts
& start to experiment existing wirings..
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Day1 : unboxing
01/28/2023 at 19:31 • 0 commentsDecember 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.