Reverse engineering the controls for a laser fume extractor, that you don‘t own. Or how to automate fans for the beambox


This blog is

  • a general insight into some low-tech reverse engineering that can be done by a python-savvy sysadmin
  • Information for anyone who might like to make their own fan controller

Now, let’s get to it

About a year ago I bought a laser cutter, as one does.

After a lot of online „reasearch“ I ended up ordering a Flux3DP beambox 40W, a 40W desktop laser cutter, capable of doing most things I want to.
After having this thing for a year I love it, easy to use and it has some great features.

The way I have it set up personally, I require an assisting fan for the exhaust, so when I want to use it I need to remember to turn on that fan. Which is something I frequently forget to do. read more

Beer, Math and API’s


In this blog we will be looking at statistics and information about happy hour prices in Reykjavík, Iceland.
I know the formatting is a bit off, I really should make my blog a bit more modern.

So, let’s just jump right into it.The Reykjavík Grapevine is an Icelandic free alternative magazine written in English. They made an app, called appy hour.
……. a few years ago, seems that they made it in 2012 originally and I just learned about it now

This app has information about happy hours in Iceland, when they start, end, prices and more and when looking for cheap beer it is a great tool, sortable either by closest bar or cheapest happy hour offer.
Me seeing all this interesting data I couldn’t just use the app, I had to explore the data. Didn’t take long to find what server the app is contacting and downloading the JSON containing all the data. I just pulled one local copy to work with, I have no need to query this information, I’ll be using the app when seeking beer in the future. read more

Iceland and HTTPS

A few weeks back a comment on a programmers group on Facebook left me wondering about how many Icelandic websites really use HTTPS so I did the only logical thing, spent hours and hours finding out.

I wanted to answer 2 questions with this, which I believe I have.

1: What percentage of .is urls are using HTTPS
2: What Cert authorities are they using.

Those not interested in the method can skip “The Code” section and go straight to the graphs and data

The Code

I started by scraping some lists of .is urls and managed to get about 300 urls which I didn’t think was enough. So I ended up paying 5$ or so for a list with 17398 .is urls. Then I got to writing some software to do something with it. read more

D&D Math, how should I roll ?

For quite some time there has been a discussion in my board game group whether is better:

Scenario A: (The 47 Method)

  • Roll 4 * 6 sided dice
  • Pick the 3 best dice that were rolled
  • This generates a a total from 3 to 18

Perform this task 7 times, pick the 6 best sets.

Scenario B: (The 56 Method)

  • Roll 5 * 6 sided dice
  • pick the 3 best dice that were rolled
  • this generates a total from 3 to 18

perform this task 6 times

The benefits of each one is clear, with scenario A you can remove 1 terribly rolled set but with scenario B you have a better chance of getting good sets but take the risk of getting a terrible set you can’t get rid of.

We are perfectly aware that we could google this but where is the fun in that ? read more

AI Þing

[Icelandic Post]

Mig hefur lengi langað að gera Alþingi effektískara (í djóki) með því að innleiða gervigreind.

Neural Network sem semur frumvörp, sem kýs um frumvörp og svo kýs nýtt þing og fyrsti partur er tilbúinn. Ég get skrifað frumvörp.

Til að byrja þurfti ég sample texta af frumvörpum, tók stutta stund að búa til dirty scraper í bash sem safnaði saman öllum frumvörpum sem hafa verið skrifuð

[Er þessi kóði fallegur ? nei ….. En virkar hann ? ójá ] read more

Custom dancing santa

It’s been way too long since I wrote something here

It’s not that I haven’t been doing strange projects, just haven’t been documenting them well.

But now, the season is upon us and I am writing this Christmas tutorial on how to customize your dancing Santa junk 😀

Dancing Santa’s are much more fun when they play gothic Christmas anthems or dirty parodies, so. Let’s get to the how part

Things used:

Cheap Dancing Santa
DFR0299 (Mp3 Module)
Speaker module (explained better below)
Relay or transistors
Basic stuff everyone with a soldering iron should have read more

Reprogramming the DT-xEM for use with HID readers

Recently started a new job, large building and every door locked with HID RFID readers and everyone has a RFID keycard around their neck to open the doors.

I already had the Dangerous Things xEM ATA5577 microchip in my left arm (EM400 emulation) but I bought an unwritten ATA5577 chip from

I did the initial tests on the cyberize chip, still in the packaging and when I got that working I decided to try to write it to my DT chip.

While the standard readers managed to read both chips very well the keypad readers had a very hard time reading the chip, even though it wasn’t even inside me. read more

Interclock: A subdermal clock concept design.

I’ve had this idea in the back of my head for quite a while now, a small clock, placed under the skin and shows the time by shining light through it. To avoid draining the battery and causing excess heat the time should only be displayed when you tell it to.
I decided to approach the trans-dermal input with a very simple but functional idea, magnetic activation using a reed relay…….Anyone willing to put a clock inside their body, has probably already inserted a magnet into a finger read more

My RFID procedure

Earlier this year I had 2 RFID chip implanted into my hands, one ATA5577 125KHz and one NFC implant.

It was quite painful but totally worth it, here is the video of the procedures

There was of course a lot of prep work associated with it, marking the correct location, sterilizing and so on that is not shown, this should NEVER be done without proper research and preparation.


Using an NFC implant to unlock an Android phone

So, this is a short tutorial on how to unlock a smartphone running Android 5.0 or latest without installing any extra software. It is the method I use to unlock my Android phone with my Dangerous Things xNT chip

This tutorial is written based on my LG phone, I do believe that other brands have slightly diffirent settings menus. If anyone is willing to recreate this tutorial on a diffirent brand I would be happy to include it

Step 1: Make sure NFC is enabled

Step 2: navigate to settings, display, lockscreen read more