I bought 2 cheap 433Mhz receiver modules from aliexpress for comparison. Continue reading Cheap 433Mhz receivers comparison
Category Archives: Projects
Old radio clock upgraded to NTP
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
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