Exposure unit
for expose PCB by UV light
BananaPi sigle board computer
Banana Pi is an open source hardware project lead by GuangDong BiPai technology co., LTD.
Radiation monitor with BananaPi Zero.
Screenshot of Grafana data interpretation of radiation meter
Load dependent speed controller of the mini drill
The basic equipment of every electrical engineering or model maker's workshop
DPS with soldered components
view of the mounted printed circuit board exported from CAD
Reflow oven
for soldering SMD prited circuits board
Reflow oven
also suitable for drying solid materials
RC433 for HomeAsistant
remote controler for garage door from HomeAssistant

Large fonts in micropythone on ESP32

          Micropython as a means of creating embedded system programs is becoming increasingly popular and gaining popularity. Often the limiting factor is the size of the operating memory or flash memory. Therefore, various images of the micropython system often have limited functionality by omitting some functions. Very often these are image and letter fonts that take up a lot of memory. Such a case is the image of micropython used for the popular esp32 series microcomputer in combination with the LVGL library.


screenshot LK-20

The described library helps solve this problem and the illustrative image shows a screen of a laboratory source using this library.

Zywall USG300 cert. error

I got my hands on a Zywall USG300 VPN router. It had been unused for a long time and was lying in a depository. I found a use for it, but a problem arose. When trying to log in via the web interface, it returned an error: ERR_SSL_VERSION_OR_CIPHER_MISMATCH

VPN router USG300

Micropython for ESP12E nodemcu Lolin V0.9

           The Espressif ESP8266 is a low-cost, high-performance wireless SOC that provides endless possibilities for integrating WiFi functionality into other systems.It can control input and output like Arduino, but the special thing is that it contains a built-in WiFi adapter.

Solution for problem with ESP modules contained CH340 chip

          Occured problem with modules fitted by the CH340 chip. This chip serves as a converter between serial interface and USB.

Very often we can meet this chip on Chinese-made modules, in my case it is quite regularly on products based on popular ESPxx processors from  Espressif Systems company.

Driver for PL2303HX USB adapter with Windows 11 operating systems

           One of the most used personal computer interfaces for connecting other devices is the serial interface. Modern computers contain at most one serial port, while laptops do not have a single one, due to the robustness of the classic RS232 connector. Therefore, a popular solution for equipping a computer with a serial interface is a serial port to USB interface adapter.

This solution offers the flexibility of the electrical parameters of the serial input, output, compared to the standard RS232 interface, where the level of electrical signals ranges from -15V to +15V.

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