Category Archives: Anything

Unsorted stuff. Regular blog posts.

ARM:0011 STM32CubeMX – Pin interrupts

Posted on June 5, 2020 by Administrator

Next tutorial- interrupts, keyboard (PS2 input) and USB COM port. I have a small keyboard in my stash. It was from some flop device made by Amstrad. This keyboard has a 4 pin connector and I had hoped that it … Continue reading →

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ARM:0009a – bug in CubeMX makefile

Posted on June 2, 2020 by Administrator

First you generate code, then you regenerate code, do make and… > “make.exe” all make.exe all -C .. make.exe[1]: Entering directory ‘F:/MyDoks/elektronika/ARM/daiktas-cube/SINGLE_UART’ Makefile:118: *** missing separator. Stop. make.exe[1]: Leaving directory ‘F:/MyDoks/elektronika/ARM/daiktas-cube/SINGLE_UART’ make.exe: *** [makefile:3: all] Error 2 > Process Exit … Continue reading →

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ARM:0010 STM32CubeMX- USB 2 COM dongle

Posted on May 29, 2020 by Administrator

This article is also an introduction, but this time a bit more practical- USB to serial port (COM) dongle. This tutorial will show how to create USB devices from “canned” software using only STM32CubeMX. For this example I used some … Continue reading →

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ARM:0009 STM32CubeMX tool from STM MCUs

Posted on May 27, 2020 by Administrator

There will be several posts about using the cheapest MCU board from China. So called Bluepill- PCB containing STM32F103C8T6 microcontroller, USB connector and some small elements. For a few bucks/euros we have upto 72MHz CPU, 64Kb of ROM and up … Continue reading →

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Collecting horses in Fallout 4

Posted on April 18, 2020 by Administrator

Due to a virus outbreak I was burning my time: It is some type of fetish.

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Repair of the Atari 2600 jr

Posted on April 18, 2020 by Administrator

I found PCB from the classic 2600 JR. It was forcefully removed from the case maybe using a hammer. The PCB is bent, some parts torn out and missing switches. PCB was cracked and several traces were broken. I repaired … Continue reading →

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Thing to know: Z80 CPU clock

Posted on April 17, 2020 by Administrator

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 →

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AM modulation, schematics, lots of transistors and perfect modulation

Posted on March 28, 2020 by Administrator

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 →

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Simple Sinewave generator

Posted on March 27, 2020 by Administrator

There is simple and good way to generate quite pure sine wave: This circuit is not very simple, but results are quite fine: output is pure sine wave. From the other side, this schematics have some minuses: it is hard … Continue reading →

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ZX LCD

Posted on March 26, 2020 by Administrator

After building ZX Spectrum clone in CPLD I ported hardware code to another project and this is a bit simpler, but it uses some mono LCD from old copy machine. Now I used only one CPLD, but I added an … Continue reading →

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