From 3b63c5139ca9a34fa79bc2eb132ecfd71897dc7e Mon Sep 17 00:00:00 2001 From: Sadeep Madurange Date: Sun, 2 Nov 2025 15:12:54 +0800 Subject: wip: Unix desktop. --- _archive/desktop-unix.md | 31 ++++++++++++++++ _archive/desktop-unix/dotfiles.tar.gz | Bin 0 -> 6397999 bytes _archive/desktop-unix/linux.png | Bin 0 -> 206255 bytes _archive/desktop-unix/openbsd.png | Bin 0 -> 318897 bytes _archive/my-first-pcb.md | 64 -------------------------------- _archive/my-first-pcb/back.jpeg | Bin 34023 -> 0 bytes _archive/my-first-pcb/back_design.jpeg | Bin 31946 -> 0 bytes _archive/my-first-pcb/front.jpeg | Bin 28997 -> 0 bytes _archive/my-first-pcb/front_design.jpeg | Bin 32174 -> 0 bytes _archive/my-first-pcb/gerber_back.zip | Bin 48217 -> 0 bytes _archive/my-first-pcb/gerber_front.zip | Bin 49605 -> 0 bytes _archive/my-first-pcb/source.tar.gz | Bin 6660 -> 0 bytes 12 files changed, 31 insertions(+), 64 deletions(-) create mode 100644 _archive/desktop-unix.md create mode 100644 _archive/desktop-unix/dotfiles.tar.gz create mode 100644 _archive/desktop-unix/linux.png create mode 100644 _archive/desktop-unix/openbsd.png delete mode 100644 _archive/my-first-pcb.md delete mode 100644 _archive/my-first-pcb/back.jpeg delete mode 100644 _archive/my-first-pcb/back_design.jpeg delete mode 100644 _archive/my-first-pcb/front.jpeg delete mode 100644 _archive/my-first-pcb/front_design.jpeg delete mode 100644 _archive/my-first-pcb/gerber_back.zip delete mode 100644 _archive/my-first-pcb/gerber_front.zip delete mode 100644 _archive/my-first-pcb/source.tar.gz (limited to '_archive') diff --git a/_archive/desktop-unix.md b/_archive/desktop-unix.md new file mode 100644 index 0000000..875e362 --- /dev/null +++ b/_archive/desktop-unix.md @@ -0,0 +1,31 @@ +--- +title: Unix-like operating systems +date: 2025-09-21 +author: Wickramage Don Sadeep Madurange +thumbnail: linux.png +layout: post +--- + +The year 2020 transformed my personal computing experience. In March 2020, I +stumbled upon Arch Linux and discovered that I could customize my desktop +environment to look and work any way I liked. I exercised that newfound freedom +to create a Matrix-themed setup: + +![Arch Linux](linux.png) + +The system employs the X display server and the i3 window manager. The terminal +emulator used is Urxvt. The translucent effect is achieved with the help of the +Xcompmgr compositor. This sort of setup was popular among minimalist Linux +users. + +In February 2024, I switched to an OpenBSD system with Xenocara (the OpenBSD +build of X display server) as the display server and i3 as the window manager: + +![OpenBSD i3](openbsd.png) + +Unlike Linux, OpenBSD includes a coherent desktop environment out of the box. +Except for the window manager, for which I prefer a tiling one, I'm now using +the default OpenBSD setup. For the window manager, I use dwm from the Suckless +team. + +Files: [dotfiles.tar.gz](dotfiles.tar.gz) diff --git a/_archive/desktop-unix/dotfiles.tar.gz b/_archive/desktop-unix/dotfiles.tar.gz new file mode 100644 index 0000000..c6774c4 Binary files /dev/null and b/_archive/desktop-unix/dotfiles.tar.gz differ diff --git a/_archive/desktop-unix/linux.png b/_archive/desktop-unix/linux.png new file mode 100644 index 0000000..40bc33b Binary files /dev/null and b/_archive/desktop-unix/linux.png differ diff --git a/_archive/desktop-unix/openbsd.png b/_archive/desktop-unix/openbsd.png new file mode 100644 index 0000000..d7489f7 Binary files /dev/null and b/_archive/desktop-unix/openbsd.png differ diff --git a/_archive/my-first-pcb.md b/_archive/my-first-pcb.md deleted file mode 100644 index 7750f20..0000000 --- a/_archive/my-first-pcb.md +++ /dev/null @@ -1,64 +0,0 @@ ---- -title: My first PCB -date: 2025-07-14 -author: Wickramage Don Sadeep Madurange -layout: post ---- - -In 2023, I started tinkering with DIY electronics as a hobby. Until now, I've -been using development boards like the Arduino Uno and ESP-32-WROOM so that I -can focus on the software. Recently, I decided to step outside of my comfort -zone and design a PCB from scratch for a door lock I'm working on. - -The lock comprises two subsystems: a fingerprint sensor in front of the door -and a servo connected to the physical lock behind the door. The fingerprint -sensor authenticates the person and signals the servo behind the door to unlock -the door over an encrypted RF channel. - - - - - - - - - - -
- Design (front) -

Footprint (front)

- 		- PCB (front) -

PCB (front)

-
- Design (back) -

Footprint (back)

- 		- PCB (back) -

PCB (back)

-
- -The PCBs have two layers. A copper region serves as the ground plane. The 0.3 -mm wide 1 oz/ft2 copper traces can carry up to 500 mA (the tracks -connecting the power source and the linear regulators have a width of 0.5 mm). -Both subsystems were functional. I was able to control the servo reliably using -the fingerprint sensor. - -The designs aren't without flaws, however. The main shortcoming of the circuits -is that they draw significant amounts of quiescent currents despite employing -sleep modes. The linear regulators were a poor choice as they dissipate too -much heat. The fingerprint sensor and the servo draw 13.8 mA (3.3 V) and 4.6 mA -(5 V) respectively, as long as they are connected to the power supply. - -Although the circuit didn't draw more than 200 mA without a load, the servo -under load could draw up to 600 mA. I'm sailing too close to the wind with 0.3 -mm copper traces. Instead, 0.4 mm wide 2 oz/ft2 traces would have -been safer. - -I'm working on improving the design to reduce idle current consumption and -extend the battery life. Despite its deficiencies, this was my first PCB -design, and I'm glad that it worked as well as it did. Custom PCB design marks -an important milestone in my DIY electronics journey. - -Files: [gerber_back.zip](gerber_back.zip), [gerber_front.zip](gerber_front.zip), - [source.tar.gz](source.tar.gz) diff --git a/_archive/my-first-pcb/back.jpeg b/_archive/my-first-pcb/back.jpeg deleted file mode 100644 index f458e69..0000000 Binary files a/_archive/my-first-pcb/back.jpeg and /dev/null differ diff --git a/_archive/my-first-pcb/back_design.jpeg b/_archive/my-first-pcb/back_design.jpeg deleted file mode 100644 index b6c0f5d..0000000 Binary files a/_archive/my-first-pcb/back_design.jpeg and /dev/null differ diff --git a/_archive/my-first-pcb/front.jpeg b/_archive/my-first-pcb/front.jpeg deleted file mode 100644 index 2b2931f..0000000 Binary files a/_archive/my-first-pcb/front.jpeg and /dev/null differ diff --git a/_archive/my-first-pcb/front_design.jpeg b/_archive/my-first-pcb/front_design.jpeg deleted file mode 100644 index f81f09c..0000000 Binary files a/_archive/my-first-pcb/front_design.jpeg and /dev/null differ diff --git a/_archive/my-first-pcb/gerber_back.zip b/_archive/my-first-pcb/gerber_back.zip deleted file mode 100644 index 26659ad..0000000 Binary files a/_archive/my-first-pcb/gerber_back.zip and /dev/null differ diff --git a/_archive/my-first-pcb/gerber_front.zip b/_archive/my-first-pcb/gerber_front.zip deleted file mode 100644 index 864334e..0000000 Binary files a/_archive/my-first-pcb/gerber_front.zip and /dev/null differ diff --git a/_archive/my-first-pcb/source.tar.gz b/_archive/my-first-pcb/source.tar.gz deleted file mode 100644 index c31aa22..0000000 Binary files a/_archive/my-first-pcb/source.tar.gz and /dev/null differ -- cgit v1.2.3