I own the radio clock on the title picture. I’ve used it for some time but it annoyed me because it drifted a lot (several seconds a day). It’s synchronized to power network frequency but it doesn’t work well in my case and I hate to adjust the clock over and over again. So I decided to sync it automatically using esp8266. Continue reading Old radio clock upgraded to NTP
Category Archives: Projects
ST-Link clone as STM32 dev board
Last time I played with this device, I only uploaded gnuk token software and it was done. This time I wanted to try some developement in Arduino framework. Continue reading ST-Link clone as STM32 dev board
DIY reflow fail
I wanted to try reflow soldering in kitchen owen. I had two boards – one with working ESP12 module (left) and one with working base board (right):
ESP32 NTP OLED clock
As a first project with my new ESP32 module with OLED display I chose to build OLED clock. I thought I’ll just find some existing code, upload it and it’s done. There are a few such projects for ESP8266 in NodeMCU. So I started with NodeMCU upload. Continue reading ESP32 NTP OLED clock
WiFi enabled sprinkler controller
This project took me a year to finish but finally it’s done. What I wanted is to build an automatic IoT sprinkler controller from cheap parts. This is my story.
$2 USB crypto token for use with GPG and SSH
If you are interrested in security devices this post may be for you. Recently I’ve found a software which makes a GPG security device out of a STM32. It’s called Gnuk. You just need a compatible board, programmer, flash the firmware and you are ready to go. I was just hoping to find some cheap device to flash to play with it.
Continue reading $2 USB crypto token for use with GPG and SSH
OrangePI: H264 HW encoding with ffmpeg
New version of Lenkeng HDMI over IP extender – LKV373A (Update 6. sep 2019)
Last week I’ve got the new version of Lenkeng HDMI extender – LKV373A. This version states incompatibility with previous version and usage of new HDbitT protocol so I was wondering what did Chinese engineers invent this time.
This blog is a log of my findings as they went through time. If you want a short review of the device watch this video from OpenTechLab (thank you!):
If you want to know more, just read the blog.
Continue reading New version of Lenkeng HDMI over IP extender – LKV373A (Update 6. sep 2019)Multicast over “stupid” networks
IP multicast is an interesting technology. It’s main purpose is to
save network bandwidth as much as possible – traffic is sent to hosts
which asked for it only (as opposed to broadcast). On the other
side, you need smarter (manageable) switches and separate and
non-trivial configuration on both routers and switches. Even more
complicated it is when you try to make it work over VPN. Continue reading Multicast over “stupid” networks
Yet another IoT thermostat
Hi all,
this post will be about my homemade IoT thermostat. 
The goal was to not install any cables (because I live in a rented flat), to go really cheap and to be able to set the temperature from anywhere. I’ll also give you some tips you should think about when building your own. Let’s get started.