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. --- _site/archive/desktop-unix/dotfiles.tar.gz | Bin 0 -> 6397999 bytes _site/archive/desktop-unix/index.html | 75 ++++++++++++++++++ _site/archive/desktop-unix/linux.png | Bin 0 -> 206255 bytes _site/archive/desktop-unix/openbsd.png | Bin 0 -> 318897 bytes _site/archive/index.html | 8 +- _site/archive/my-first-pcb/back.jpeg | Bin 34023 -> 0 bytes _site/archive/my-first-pcb/back_design.jpeg | Bin 31946 -> 0 bytes _site/archive/my-first-pcb/front.jpeg | Bin 28997 -> 0 bytes _site/archive/my-first-pcb/front_design.jpeg | Bin 32174 -> 0 bytes _site/archive/my-first-pcb/gerber_back.zip | Bin 48217 -> 0 bytes _site/archive/my-first-pcb/gerber_front.zip | Bin 49605 -> 0 bytes _site/archive/my-first-pcb/index.html | 109 --------------------------- _site/archive/my-first-pcb/source.tar.gz | Bin 6660 -> 0 bytes 13 files changed, 79 insertions(+), 113 deletions(-) create mode 100644 _site/archive/desktop-unix/dotfiles.tar.gz create mode 100644 _site/archive/desktop-unix/index.html create mode 100644 _site/archive/desktop-unix/linux.png create mode 100644 _site/archive/desktop-unix/openbsd.png delete mode 100644 _site/archive/my-first-pcb/back.jpeg delete mode 100644 _site/archive/my-first-pcb/back_design.jpeg delete mode 100644 _site/archive/my-first-pcb/front.jpeg delete mode 100644 _site/archive/my-first-pcb/front_design.jpeg delete mode 100644 _site/archive/my-first-pcb/gerber_back.zip delete mode 100644 _site/archive/my-first-pcb/gerber_front.zip delete mode 100644 _site/archive/my-first-pcb/index.html delete mode 100644 _site/archive/my-first-pcb/source.tar.gz (limited to '_site/archive') diff --git a/_site/archive/desktop-unix/dotfiles.tar.gz b/_site/archive/desktop-unix/dotfiles.tar.gz new file mode 100644 index 0000000..c6774c4 Binary files /dev/null and b/_site/archive/desktop-unix/dotfiles.tar.gz differ diff --git a/_site/archive/desktop-unix/index.html b/_site/archive/desktop-unix/index.html new file mode 100644 index 0000000..7d2ed15 --- /dev/null +++ b/_site/archive/desktop-unix/index.html @@ -0,0 +1,75 @@ + + + + + Unix-like operating systems + + + + + Unix-like operating systems + + + + + + + + + +
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+ + + +
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+

UNIX-LIKE OPERATING SYSTEMS

+
21 SEPTEMBER 2025
+
+

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

+ +

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

+ +

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

+
+

by Wickramage Don Sadeep Madurange

+
+
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MY FIRST PCB

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14 JULY 2025
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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)

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- Design (back) -

Footprint (back)

- 		- PCB (back) -

PCB (back)

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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_front.zip, - source.tar.gz

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by Wickramage Don Sadeep Madurange

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