Category Archives: Hobby

Leather straps for a painting easel

Doing a project using leather is something I do not often enough.
So I’m always looking for new ideas/projects.

This weekend, I made some straps for portable painting easels.
Keeping the poles of the tripod together with multiple straps and a longer leather strip allows for easy carrying on your back.

A simple project, I need some challenge next time!

My leather strip cutter I made in 2011.

Tiny animator for stop-motion

I was working on a RP2040 HID project, but I needed some components I didn’t have … right now .. again ..

So I made something else ..

A tiny animator for stop motion animations using my webcam, python and OpenCV.

For claymotion or lego or whatever.

The program displays your webcam with the previous snapshot overlayed, so you can position everything relative to your previous snapshot.

Difference between two shots.

Press B to take a frame.

Just a proof of concept using a (BAD) webcam. (Don’t look at my hand )

CODE (short but you need OpenCV)

import  cv2
from datetime import datetime
# black is just a start empty image .. 
cap = cv2.VideoCapture(0)

while True: 

    dim = (800,600)
    img1 = cv2.resize(img, dim, interpolation = cv2.INTER_AREA)
    vid1 = cv2.resize(vid, dim, interpolation = cv2.INTER_AREA)

    cv2.imshow('overlay', result)
    if(cv2.waitKey(10) & 0xFF == ord('b')):
            now =
            current_time = now.strftime("%d_%m_%Y_%H_%M_%S")
            filename = '%s.png' % current_time
            if not cv2.imwrite(filename, vid1):
                raise Exception("Could not write image")

Pressing B fills your directory with PNG’s
like 24_10_2023_00_01_01.png (date formatted)

convert to GIF

convert -delay 10 -loop 0 24*.png animation.gif

GLABios for Laser XT/3

In previous post :

I mentioned a 2 ROM setup because the 8086 is 16bits instead of 8.
So I was wondering that maybe a recompile was needed, or the data being split over two roms (odd/even)

The guy from GLABios was so kind to build me two interleaved roms.

So while working on a padded bench, I tested the ROMs.

Working outside .. on the padded bench

Back to the roms, it didn’t work!

But I missed a detail in the technical manual (the bold text)

In Turbo XT /2 and Turbo XT /3, there are two 28-pin sockets for ROM,
both of them are occupied by 2764 which stored the BIOS. The contents
of the two 2764 are identical.
One of them contribute the ODD Byte to the system and the other EVEN Byte. Together they support 16 Bit BIOS

I don’t know why this is how it works, but when I flashed two the same 28C64’s it worked!
(I also tought that is was strange that both original roms had the same markings.

It workes!

Only remarks/observations:

  • There was a longer wait time before the CF Card was detected/accessed
  • GLABios mentions 8088 in the splashscreen, but the machine is a 8086


GLABios was not updated for displaying 8086 yet.
Error 1701 was the (old spinning) harddisk not being connected.

Nice .. harddisk infomation like size, rom address and CHS

8086 sideway scroller ‘n stuff

Today I was working on my own brew ISA card (wirewrapping).
Did some mini modeling stuff.
Sorted some pipetunes.
And played around with my 8086.

Got it on a desk now, and replaced the harddisk with the CF card.
Also got an old SoundBlaster working, so i wanted to see what of my old code could still run.
Apparanty most code was compiled for 386/486 🙁
So i recompiled some stuff.
Below a horizontal scroller example.

Meanwhile i got my new fans in for my NUC (Kodi player, it was making a hell of a noise due to bad ball bearings.

Planxty Irwin Concertina Notation

While working on a harmony for Irmgard and me in Musescore, i tought it would be nice to have it also in another notation.

Above a Musescore screenshot.

When using below button assignment, we can easily rewrite above into another notation.

Write musescore as MusicML/mxl Music xml.

Install xml2abc from

python INPUTFILE.mxl

My abc file

T:Planxty Irwin
V:1 treble nm="Henri" snm="H"
|: d | B2 d | c2 A | F2 A | G3/2 d/ B | A G F | G3/2 A/ B | D2 E | F2 d | B2 d | c2 A | F2 A |
 G3/2 d/ B | A G F | G3/2 A/ B | e d c | B2 d | B3/2 c/ B | B G B | c3/2 d/ c | c A F | G d e |
 c d e | d3/2 c/ A | d c A | B c d | c B A | F G A | G3/2 d/ B | A G F | G3/2 A/ B | e d c | B2 :|

Using below bash script you can convert this to PDF WITH concertina notations.
WARNING: I didn't include all keys (yet).
NOTE: Easy to adjust to other notations.
if [ $# -lt 2 ]; then
    print "script orgname convertname"
    exit 1
: > parced
cat $1 | awk '/^\|/ {exit} {print}' > header
cat $1 | grep "|" | tr -d '[0-9]:/'> parse
cat parse | while read ; do 
echo $REPLY
echo -n "w: "

for word in $(echo $REPLY) ; do

	if [ "$word" == "|" ] ; then echo -n " | " 
	elif [ "$word" == "D" ] ; then echo -n " 2 ";
	elif [ "$word" == "G" ] ; then echo -n " 3 ";
	elif [ "$word" == "B" ] ; then echo -n " 4 ";
	elif [ "$word" == "d" ] ; then echo -n " 5 ";
	elif [ "$word" == "g" ] ; then echo -n " 6 ";
	elif [ "$word" == "b" ] ; then echo -n " 7 ";
	else echo -n " * "
echo ""

echo -n "w: "

for word in $(echo $REPLY) ; do

	if [ "$word" == "|" ] ; then echo -n " | " 
	elif [ "$word" == "F" ] ; then echo -n " 2 ";
	elif [ "$word" == "A" ] ; then echo -n " 3 ";
	elif [ "$word" == "c" ] ; then echo -n " 4 ";
	elif [ "$word" == "e" ] ; then echo -n " 5 ";
	elif [ "$word" == "f" ] ; then echo -n " 6 ";
	elif [ "$word" == "a" ] ; then echo -n " 7 ";
	elif [ "$word" == "E" ] ; then echo -n " 4' ";  # <============ example 2nd row
	else echo -n " * "
echo ""

) >> parced
cat header parced > $abc
abcm2ps -x -O - "$abc" | ps2pdf  -sPAPERSIZE=a4 - "$(echo  $abc | cut -f2 -d/ | sed 's/abc/pdf/g')"

Example output (Harmony part)

Making a leather seat for a man-cave

Made a little design in blender.
A friend needed a seat in his man-cave, the same one I fitted with the mobile phone charging station, and wled ledstrings.

It is for below some stairs.
It’s a piece of wood (leftovers), some leather I still had lying around.
Scaffolding tubes, foam, some decorative nails and stage-tape.

Laser cutting a door sign

I’ve got a nice stone slate, perfect for a door sign.

I wanted to paint our names and house number. But now that i’ve got a lasercutter, lets do that.

I’m going to use the design i’ve used for the Folkband Bags, and add some stuff.

First test on the back of the slate

Using a Sculpfun S9, Power 100 and speed 100mm/s

I will add the final result to this page