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Tag Archives: MCU
ARM36: Bubble LEDs
(AI translated. Orginal article from 2022.06.15) Antique LED Indicator, probably from some Soviet calculator. Its imperfection is charming: The symbols are tiny (hence the plastic lenses), the brightness is minimal (at saving currents). But it’s charming in its own way. … Continue reading
Anything with palm and BT (Bluetooth)
(AI translated from 2022.05.24.) There isn’t much time to write anything properly, so here are a few random photos: Oh dear, those are “keemkės”! Russian and Soviet palladium with platinum. This is some kind of coaxial splitter. Probably powerful. This … Continue reading
ARM35: LCD and FSMC on STM32Fxxx
(AI translated from 2022.05.02) Short prehistory: we collected some PCBs with STM32F103 chips and an unknown LCD. The LCDs were of two types, and the PCBs were also of several variants. Some had another STM32 BGA chip and ROM/RAM chips. … Continue reading
Purple pill STM32F PCB
(AI translated, original post from 2022.04) Do you remember, I wrote about the remnants? About the mountain of STM32F103VBT chips with slightly bent legs? So, I made an experimental board. I wired ALL the pins to 0.1″ connectors. I also … Continue reading
Shortage of Chips, You Say?
(AI translated, from March 25, 2022) A good person reported that they brought some chips. But somehow there was no time—work piled up. After a few days, I went and saw the remnants…. It even squeezed my heart… STM32F103VBT6: Medium-density … Continue reading
AVR103: Graphics module VFD GU140×16
(AI translated) Lithuanian airports disposed of some equipment, and there were devices with VFD screens (the devices themselves were specific, with very strange software). At least I got the VFD screens: Noritake Itron GU112x16G-7806A V3. I think the software is … Continue reading
HUB08 LED board (matrix) display protocol and interface to STM32F103
HUB08 LED display control protocol explained. Continue reading
Printer from calculator, part 2
Continued from part 1. The printer from the calculator is a neat toy, but we want a real USB printer. So, using my new STM32F103 CubeMX USB printer class for communication with the host computer and some tricky INT based … Continue reading
Printer from calculator, part 1
In a pile of e-waste I found a printing calculator, Citizen CX-123II. It is a regular calculator (with some wicky calculations), but with a printer- all output from the screen are hard-copied to paper roll. It can print only numbers … Continue reading
ARM:0018 STM32CubeMX hack – printer class device
This article is about printer class device for STM32F103 and STM32CubeMX. Somehow there is NO printer device class example in whole internet. There ar CDC or HID examples copied from same STM32CubeMX example with minimal explanation, few of mass storage … Continue reading