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Tag Archives: DIY
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
LM2596* modules from China
(AI translated) For my latest collection exhibit, I decided to upgrade the power supply – to create something like the LM2596 from an overclocked 7805… Before the postal service went crazy, I bought the cheapest PCBs with counterfeit LM2596ADJ from … Continue reading
My 484 enemies
I have 484 enemies… Solder balls, 0.55mm diameter. Just testing my first 4 layer PCB with some second hand FPGA chips. I am using old solder paste to build new balls… but with bad result. Two pins are missing (from … 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
ARM:0017 – go to sleep clock
This is a “gamers” clock. It sits near the monitor and shows the real time and time computer is on. This is achieved using USB as power supply. Also, the same USB port is used to set the clock. Battery … Continue reading
ARM:0015 STM32CubeMX screen libraries, part 2
Continued from Part 1. There are lots of different LCD or OLED screens in the market. Typically, it is possible to define 3 types of screens according to interface type: I2C, SPI and parallel data bus. There are also analog … Continue reading
ARM:0014 STM32CubeMX libraries for sensors and screens
In fact, any new program written for MCU is only copy-paste from older projects. Not real copy paste, but using the same libraries and subroutines. For some upcoming bigger project, I decided to use STM32 microcontroller, this means, I need … Continue reading
ARM:0013 STM32CubeMX – USB HID keyboard
Now we will build a USB keyboard. This project is based on STM32CubeMX canned example, HID mouse (see previous article). But we will change mouse to keyboard. Both devices are from the same HID class. First we need to change … Continue reading
Thing to know: Z80 CPU clock
I just only want to send notes to myself. Z80 CPU clock must be 5Vpp and pure TTL levels sometimes are too low for good and stable CPU work. Even this old CPU is very stable at 5Vpp clock, meanwhile … Continue reading
AM modulation, schematics, lots of transistors and perfect modulation
I was testing various AM radios and noticed that I don’t have a proper AM source. The AM broadcasting station in my region is very scarce and weak. Also, I wanted more options for radio receiver testing. I thought that … Continue reading