Category Archives: Hobby

SG90 servo Arm generator in OpenScad

SG90 Servo
Adjust the arm lenght using the slider, export to STL and print!

Openscad can be found here

Openscad source

sliderWithMax =40;  // [80]

	difference() {
		union() {
				difference() {

					hull() {
						circle(d=6,$fn = 100);
						translate([sliderWithMax-2,0]) circle(d=4,$fn = 100);

					translate([4,0]) for (i=[0:sliderWithMax/2-3]) translate([i*2,0]) circle(d=1,$fn = 100);
			cylinder(d=6.7, h=3.8, $fn=100);
		translate([0,0,-1]) cylinder(d=2.5, h=3.8+2, $fn=100);
		translate([0,0,-1]) cylinder(d=4.7, h=1+1, $fn=100);	
		translate([0,0,3.8-2+1]) cylinder(d=4.7, h=2+1);	

Old and new computer games

Only the ones i’ve played recently or having good memories playing it.
Only noteworthy games

Pyramid Mummy pharaoh thingy ??? One of the first games i remember.
(Besides Pong on a “pong-only” system)

I’ve played a Mummy game in Black/White on a XZ81 or ZX Spectrum, one of the first Computers i had access to. (Richard)
But i can´t find/remember the name.

The Sentinel (1986)

In The Sentinel, the player takes the role of a Synthoid, a telepathic robot who has to take control of a number of surreal, checkered landscapes of hills and valleys, by climbing from the lowest spot, where the hunt begins, to the highest platform, over which the Sentinel looms.

The Synthoid itself cannot move across the level; instead it can look around, accumulate energy by absorbing the objects that are scattered across the landscape, create stacks of boulders, generate inert Synthoid shells and transfer its consciousness from one of these clones to another.

Kings Quest II? (1985)

Played this with my friend Richard on his Atari ST

Few years later, same kind of Game Engine:

Leisure suit larry in the land of the lounge lizards

The Myst series (1993-)


The player races a vehicle against several other computers controlled competitors in various settings, including city, mine, and industrial areas. The player has a certain amount of time to complete each race, but more time may be gained by collecting bonuses, damaging the competitors’ cars, or by running over pedestrians. Unusually for a racing game, checkpoints do not extend the time limit.

7th Guest

The 7th Guest is an interactive movie puzzle adventure game, produced by Trilobyte and originally released by Virgin Interactive Entertainment in April 1993. It is one of the first computer video games to be released only on CD-ROM. The 7th Guest is a horror story told from the unfolding perspective of the player, as an amnesiac. The game received a great amount of press attention for making live action video clips a core part of its gameplay, for its unprecedented amount of pre-rendered 3D graphics, and for its adult content. In addition, the game was very successful, with over two million copies sold. It, alongside Myst, is widely regarded as a killer app that accelerated the sales of CD-ROM drives.

DOOM and Quake

Many many hours i’ve spend playing doom with Mandy on my first network (1995?)
Quake was my Graphics Card Checker, i never made it to level two!


Shadow of the Beast, Super Frog ,The Sentinel, Game of Thrones and Dr Mario

And dual player Stunt Car Racer. We played this before there were networks, using a serial cable!

Simulators and more

I used to have Microsoft Flightsim (the old version) , but my main operating system is Linux so i switched to XPlane (Windows, linux and Mac) See other posts about Flightsims

VR games

We bought VR glasses.
Besides viewing movies in 3D, playing with Blender in 3D, Xplane flightsimulator there are some games i sometimes play.

I expect you to die, WWI Warplanes, Green Hell and Mass Exodus Redux. The last one is great fun together with a PC player.

Android games

Tried several games, non stuck.
I enjoyed “SpaceTeam” the most.
Current (dorment on my phone) : Mekorama, BinaryGrid2 (Yes Nerd), Dice me and 2 Player Reactor (those last two, for playing with friends while traveling)

Arcade games

I only knew Galaga, on a table version in Germany (We played there with the Concord Pipe Band)
The other one was
Hyper Olympics by Konami ( Snackbar “Lunch” when attending school LTS Deventer )

PC Games (Recent)

Uboot, Xplane Flightsimulator,Keep talking and nobody explodes

Switch Games (Recent)

Limbo, Unravel Two, Death Squared,Machinarium,Degrees of Separation, Guacamelee 2
Mostly Co-op

Sidetrack … pinball

I really like the Terminator pinball game.
There is one in Zwolle at
(This one i played when i was a soldier in 1992)
I have some test setups for Virtual Pinballs, but its not the same.

“Recent” old Skool games

1942 –

Metal Slug series –

Escape case work in progress

UPDATE: 20230214 more work done

Making a frame in a aluminum case, using rivets and nut rivets.

The nut rivet tool (suggestion by Duncan) is a superb addition in my tool shed!

There is place for 4 modules in this “test” case. I need to move the holes for the rivet-nuts, because the modules should go in every position.
(Also 4 rounded corners)

Module example


Alumium squares instead of these wooden temporary pieces.
Making a buildin power connector like this.
Think of something to place in the lid!

UPDATE: Didn’t go for this solution.

UPDATE: 20230214

Mobile Raspberry Access Point with Mqtt and a display

UPDATE: 20230214 / 20230224

Install Bullseye on a SDCard

Enable wifi country code using raspi-conf
(While you at it, enable I2C for the display)

Install and configure an Access Point

# As root
apt update
apt upgrade
apt install hostapd
apt install dnsmasq
systemctl stop hostapd
systemctl stop dnsmasq

cat <<EOF > /etc/hostapd/hostapd.conf

cat <<EOF >> /etc/dnsmasq.conf

cat <<EOF >> /etc/dhcpcd.conf
interface wlan0
nohook wpa_supplicant
static ip_address=
static routers=
static domain_name_servers=

sed -i s/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/g /etc/sysctl.conf

mkdir /etc/nftables
cat <<EOF > /etc/nftables/nft-stat-ap.nft
flush ruleset

table inet ap {
        chain routethrough {
                type nat hook postrouting priority filter; policy accept;
                oifname "eth0" masquerade

        chain fward {
                type filter hook forward priority filter; policy accept;
                iifname "eth0" oifname "wlan0" ct state established,related accept
                iifname "wlan0" oifname "eth0" accept

chmod +x /etc/nftables/nft-stat-ap.nft
cat /etc/nftables.conf | grep nft-stat-ap.nft || echo 'include "/etc/nftables/nft-stat-ap.nft"' >> /etc/nftables.conf

systemctl unmask hostapd
systemctl enable hostapd
systemctl enable nftables


UPDATE: 20230214

Now in its case, added two buttons and one led.

UPDATE : 20230224 mqtt config

apt-get install mosquitto mosquitto-clients

vi /etc/mosquitto/conf.d/remotemqtt.conf
per_listener_settings true
# internal mqtt
listener 1883
allow_anonymous true
# connection over the internet
connection bridge-01
address remoteserver:8883
bridge_cafile /etc/mosquitto/certs/ca.crt
bridge_keyfile /etc/mosquitto/certs/remoteaccesspoint.key
bridge_certfile /etc/mosquitto/certs/remoteaccesspoint.crt
topic escape/# both 0
remote_username remoteuser
remote_password remotepass

########## remote server config

cd /etc/mosquitto
mosquitto_passwd passwords remoteuser

cd /etc/mosquitto/certs
./ client remoteaccesspoint

copy ca.crt remoteaccesspoint.key and remoteaccesspoint.crt to accesspoint

pid_file /var/run/
persistence true
persistence_location /var/lib/mosquitto/
#per_listener_settings true
# Plain MQTT protocol
listener 1883
allow_anonymous true
# End of plain MQTT configuration
listener 8883
cafile /etc/mosquitto/certs/ca.crt
certfile /etc/mosquitto/certs/webserver.fash.lab.crt
keyfile /etc/mosquitto/certs/webserver.fash.lab.key
allow_anonymous false
password_file /etc/mosquitto/passwords
# End of MQTT over TLS/SLL configuration
listener 9001
protocol websockets
# End of plain Websockets configuration
# WebSockets over TLS/SSL
listener 9883
protocol websockets
cafile /etc/mosquitto/certs/ca.crt
certfile /etc/mosquitto/certs/webserver.fash.lab.crt
keyfile /etc/mosquitto/certs/webserver.fash.lab.key
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
connection bridge-01
address extramqttserver:1883
topic lscspm1/# both 0
topic owntracks/# both 0
topic escape/# both 0

log_type all

Controlling Display and MQTT messages examples

python3 -1 "line 1" -2 "line 2"


# requires
import RPi_I2C_driver
from time import *
import sys, getopt

#python3 fix
unichr = chr 

mylcd = RPi_I2C_driver.lcd()
# test 2                  1234567812345678

def main(argv):
   line1 = ''
   line2 = ''
      opts, args = getopt.getopt(argv,"h1:2:",["txt1=","txt2="])
   except getopt.GetoptError:
      print (' -1 <line1> -2 <line2>')
   for opt, arg in opts:
      if opt == '-h':
         print (' -1 <line1> -2 <line2>')
      elif opt in ("-1", "--txt1"):
         line1 = arg
      elif opt in ("-2", "--txt2"):
         line2 = arg

   mylcd.lcd_display_string(line1, 1)
   mylcd.lcd_display_string(line2, 2)
if __name__ == "__main__":

Print internal and external ip

myip=$(/usr/sbin/ifconfig eth0 | grep "inet " | awk '{ print $2 }')
extip=$(curl -s
python3 -1 "i $myip" -2 "e $extip"

mosquitto health tester

timeout 1 mosquitto_sub -t '$SYS/#' -C 1 | grep -v Error || exit 1

Button press shutdown

raspi-gpio get 27  | grep level=0 >/dev/null 
if [ $? == 0 ] ; then

python3 -1 "shutting" -2 "down"
/usr/sbin/halt -p

Cleaned-up minimal mqtt poster

#include <WiFi.h>
#include <PubSubClient.h>

const char* ssid = "ssidname";
const char* password = "ssidpass";
const char* mqttServer = "";

WiFiClient espClient;
PubSubClient client(espClient);

void initWiFi() {
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {

void setup() {
  Serial.print("RRSI: ");
 if (client.connect("testmodule")) {

 client.publish("escape/testclient", "connected");
    } else {
            Serial.println("Mqtt not connected");


void loop() {



Don’t know what game to buy?
Head over to

Ratings, wiki, manuals, reviews, forum and more
Get you own collection list online

Our list is here

My top 5 games (at the moment) are:

  • Uboot
  • Memoir ’44
  • Monster Slaughter
  • Lord of the Rings
  • Codenames Duet

U-BOOT: The Board Game is a fully cooperative, real-time tabletop game of WW2 submarine warfare. It allows 1 to 4 players to assume the roles of the Captain, the First Officer, the Navigator, and the Chief Engineer on board of a type VIIC U-boat. The game is driven by a companion app, allowing for an unprecedented level of realism, as well as a challenging enemy A.I. which will push your skills to the limit. The action unfolds both on the strategic and the tactical scale, always demanding teamwork, efficient crew management, and quick situation assessment.

Uboot game with own 3D printed submarine with leds

Memoir ’44 is a historical boardgame where players face-off in stylized battles of some of the most famous historic battles of World War II including Omaha Beach, Pegasus Bridge, Operation Cobra and the Ardennes. The game includes over 15 different battle scenarios and features a double-sided hex game board for both beach landings and countryside combat. Each scenario mimics the historical terrain, troop placements and objectives of each army. Commanders deploy troops through Command and Tactic cards, applying the unique skills of his units — infantry, paratrooper, tank, artillery, and even resistance fighters — to their greatest strength.

Monster Slaughter is a tactical game inspired by horror movie classics, where each players takes control of a family of three monsters: father, mother and child, each with their own stats and family power. Their objective is to scour the cabin looking for five guests, find their hiding spot and “take care” of them! Each victim hides in a pile of cards that monsters must search through to find them, gathering items and traps as they do. Once revealed, a guest’s miniature is put on the board and can be attacked!

However, each player has secretly set a killing order for these guests, and killing them in order is worth more points. They can use their item cards to defend the guests against other monsters or scare the victims away to other rooms, so the guests die in a more favorable order!

Monster Slaughter

Some DIY own build games are:
Shogi (Japanese Chess)
Crokinole (Canadian game)

Started on a mobile over the internet Escape room experiment

I’ve been working on some modular gadgets which can be combined to make a complete puzzle.

I like games like Keep-talking-and-nobody-dies. (Which is a computer game, but you have to play it with multiple persons and a physical “manual” Great fun!)

And i like real escape rooms.
There are some puzzle “rooms” you can buy in the game store, it is okay but many are for single use only.

I’ve been following some people on youtube, i saw some great ideas but not a remote over the internet using physical knobs and switches.

This is a RFID reader with an old Amico Esp8266 Arduino. It sends RFID information to the MQTT broker

Some other tools ‘n knobs .. and stuff

I want to use Adhoc Wifi and a Mqtt/Nodered setup which uses a mqtt over the internet to get people (and their knobs) connected

I already got a lot of test schematics

Left part of the “connect the wires puzzle” right a solenoid electrical lock)

Schematic for the MQTT enabled RFID module

ESP8266 <-> RC522
D8            SDA
D5            SCK
D7           MOSI
D6           MISO
GND           GND
D1            RST
3V3           3V3


Below will write the RFID id to “rfid/id” and resets this when you remove the tag to “rfid/id = 0”

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <PubSubClient.h>
#include <MFRC522.h>

#define SS_PIN D8
#define RST_PIN D1

MFRC522 mfrc522(SS_PIN, RST_PIN);
unsigned long cardId = 0;

WiFiClient net;
PubSubClient client(net);

const char* mqtt_server = "MQTTBROKER";
const char* ssid = "MYSSID";
const char* password = "MYWIFIPASSWD";

void setup() {

  WiFi.begin(ssid, password);

  client.setServer(mqtt_server, 1883);

void reconnect() {
  while (WiFi.waitForConnectResult() != WL_CONNECTED) {
    WiFi.begin(ssid, password);

  while (!client.connected()) {
    String clientId = "NodeMCUClient-";
    clientId += String(random(0xffff), HEX);

    if (!client.connect(clientId.c_str(), "rfidclient", "...")) {

void loop() {

  if (!mfrc522.PICC_IsNewCardPresent()) {

  if (!mfrc522.PICC_ReadCardSerial()) {

  cardId = getCardId();

  char buffer[10];
  sprintf(buffer, "%lu", cardId);
  client.publish("rfid/id", buffer);

  uint8_t control = 0x00;

  do {
    control = 0;
    for (int i = 0; i < 3; i++) {
      if (!mfrc522.PICC_IsNewCardPresent()) {
        if (mfrc522.PICC_ReadCardSerial()) {
          control |= 0x16;

        if (mfrc522.PICC_ReadCardSerial()) {
          control |= 0x16;
        control += 0x1;
      control += 0x4;

  } while (control == 13 || control == 14);

  client.publish("rfid/id", "0");


unsigned long getCardId() {
  byte readCard[4];
  for (int i = 0; i < 4; i++) {
    readCard[i] = mfrc522.uid.uidByte[i];

  return (unsigned long)readCard[0] << 24
    | (unsigned long)readCard[1] << 16
    | (unsigned long)readCard[2] << 8
    | (unsigned long)readCard[3];

Schematics used for the Solenoid lock

Software is a mqtt example from the internet which toggles a PIN on the arduino.

Magic Mirror no more .. lets reuse the display

I never look in the mirror, so why do i need one?
The mirror foil was already ugly in the corners.
There were bumps.
Never finished a proper interface

This one was made using a touch screen, so there are always fingerprints you could see

I’m going to use the display for an in-house small Escape Room idea i have.

Only the time part still worked, but i could not find the right cables for the touch part. The buttons displayed are meaningless anyway 🙂
Just a mockup

Mirror part was done using a Safety/One way mirror foil.
Cut a part as large as you screen, spray a little water and stick it on.

At some point i displayed Dashticz on there.
Apparently i started playing with a magic mirror setup in 2015, according some timestamps of code on my fileserver.

Automatic photo sorting with Gps location lookup

We take a lot of pictures, with our Nikon camera and our mobile phones.

(Apparently in 2019 5544 pictures)

Some stats

757 20190803 - on a single day (Holiday)

Average pictures per month
locate "/2019/" | egrep -i "photoalbum|gsm" | egrep -i "mp4$|jpg$" | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}' | cut -c-6 |sort | uniq -c | sort -n | awk '{ sum += $1; n++ } END { if (n > 0) print sum / n; }'

Besides android pictures being automatically uploaded to our nextcloud, I’m using some apps and scripts to get pictures and movies stored on my fileserver. (bash scripts/andftp)

For sorting those media files, i made a sorting script.
(Today I added a location sorting addition using GPS information stored in the exif information.

  • jpg and jpeg (add your own extentions)
  • mp4 and mov (for mobile and nikon)
  • Sorts by camera model/year/date/location
  • tries to extract date from filename when not found in exifinfo
  • Sorts whatsapp media
  • Sorts Raw


pip3 install reverse_geocoder
You need python3, exiftool, exiftime and mediainfo

copy below python script in ~/bin/

( need more info? change last print entry admin1/admin2)
[{‘lat’: ‘-39.45556’, ‘lon’: ‘173.85833’, ‘name’: ‘Opunake’, ‘admin1’: ‘Taranaki’, ‘admin2’: ‘South Taranaki District’, ‘cc’: ‘NZ’}]

import reverse_geocoder as rg
import sys


coordinates = (lat,lon)

results = # default mode = 2

#print (results)

for entry in results:
    print(entry['name'] + "(" +  entry['cc'] + ")")

And a bash script /usr/local/bin/

#set -x


rawcnt=`ls | grep -i  nef$ | wc -l`
if [ "$rawcnt" = "0" ] ; then
echo "no raw"
mkdir raw 2>/dev/null
ls | grep -i nef$ | while read ; do mv $REPLY raw ; done

ls | egrep -i "jpg$|jpeg" | while read ; do 
	getmodel=$(exiftool "$REPLY" |grep "Make " | awk '{ print $3 }')
	if [ "$getmodel" != "" ] ; then 
	echo "$REPLY" | grep WA0 >/dev/null && getmodel=whatsapp/

	gpsinfo=$(exiftool -c "%+.6f" "$REPLY" |grep "GPS Position" | cut -d":" -f2 | tr -d ' ' | sed s/,/\ /g)
	if [ "$gpsinfo" != "" ] ; then 
		location=$(python3 $reversepath $gpsinfo | grep -vi load | sed s/\(NL\)//g)
	dater=$(exiftime "$REPLY" 2>/dev/null | egrep "Created|Digitized" | sed s/Digitized/Created/g | tail -1  | cut -c 16-19,21,22,24,25)
	if [ "$dater" = "" ] ; then 
#		echo "Trying from filename"
		dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}-[[:digit:]]{2}-[[:digit:]]{2}')

		if [ "$dater" = "" ] ; then 
#			echo "Trying from filename - maybe without dashes"
			dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}')

	if [ "$dater" != "" ] ; then 
		year=$(echo $dater | cut -c-4)
		mkdir -p "${getmodel}$year/${dater}/$location"
		mv "$REPLY" "${getmodel}${year}/${dater}/$location"
		mkdir -p "${getmodel}unknowndate/$location"
		mv "$REPLY" "${getmodel}unknowndate/$location"

ls | egrep -i "mov$|mp4$" | while read ; do 
	getmodel=$(exiftool "$REPLY" |grep "Make " | awk '{ print $3 }')
	if [ "$getmodel" != "" ] ; then 

	echo "$REPLY" | grep WA0 >/dev/null && getmodel=whatsapp/
	gpsinfo=$(exiftool -c "%+.6f" "$REPLY" |grep "GPS Position" | cut -d":" -f2 | tr -d ' ' | sed s/,/\ /g)
	if [ "$gpsinfo" != "" ] ; then 
		location=$(python3 $reversepath $gpsinfo | grep -vi load | sed s/\(NL\)//g)
	dater=$(mediainfo "$REPLY" | grep Encode | tail -1 | cut -f2- -d:  | cut -f3 -d" " | sed s/-//g)
	if [ "$dater" = "" ] ; then 
#		echo "Trying from filename"
		dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}-[[:digit:]]{2}-[[:digit:]]{2}')

		if [ "$dater" = "" ] ; then 
#			echo "Trying from filename - maybe without dashes"
			dater=$(echo $REPLY | grep -Eo '2[[:digit:]]{3}[[:digit:]]{2}[[:digit:]]{2}')

	if [ "$dater" != "" ] ; then 
		year=$(echo $dater | cut -c-4)
		mkdir -p "${getmodel}$year/${dater}/$location"
		mv "$REPLY" "${getmodel}${year}/${dater}/$location"
		mkdir -p "${getmodel}unknowndate/$location"
		mv "$REPLY" "${getmodel}unknowndate/$location"

Example running in a directory with mixed media

# Raw images get moved into a RAW directory
no raw

# Samsung phone detected with date and GPS location
mkdir -p samsung/20220717/Hilversum
mv 20220717_133453.jpg samsung/20220717/Hilversum

# OnePlus phone
mkdir -p OnePlus/20021208/Voorburg
mv IMG_20190109_091825.jpg OnePlus/20021208/Voorburg

# Realme (Added country when not NL)
mkdir -p realme/20220607/Isle of Islay(GB)
mv IMG20220607213630.jpg realme/20220607/Isle of Islay(GB)

# Whatsapp has no date embedded so it get it from filename
Trying from filename
Trying from filename - maybe without dashes
mkdir -p whatsapp/20221021/
mv IMG-20221021-WA0000.jpg whatsapp/20221021/

# Nikon without GPS
mkdir -p NIKON/20220613/
mv DSC_1423.MOV NIKON/20220613/

# Whatsapp video without exif
mkdir -p whatsapp/20170528/
mv VID-20170528-WA0006.mp4 whatsapp/20170528/

# No camera name detected in exif from mobile movie
mkdir -p 20190114/Maarssen
mv VID_20190114_142455.mp4 20190114/Maarssen

# Location in mp4
mkdir -p 20220607/Lamlash(GB)
mv VID20220607155044.mp4 20220607/Lamlash(GB)


./realme/2022/20220607/Isle of Islay(GB)/IMG20220607213630.jpg

You could automate this using incrond
apt-get install incron
add your user to /etc/incron.allow
incrontab -e

/fileserver/mediain/ IN_CREATE /usr/local/bin/
Coping a file in the directory, auto sort and move to correct location

cd /home/user/media

Workshop Cyanotype

The cyanotype (from Ancient Greek kuáneos, “dark blue” and túpos, “mark, impression, type”) is a slow-reacting, photographic printing technique. It produces a cyan-blue print used for art as monochrome imagery applicable on a range of supports, and for reprography in the form of blueprints. For any purpose, the process usually uses two chemicals: ferric ammonium citrate or ferric ammonium oxalate, and potassium ferricyanide, and only water to develop and fix. Announced in 1842, it is still in use.

This technique was also used as a method of copying drawings.
For example buildings and schematics. While making copies of drawings with the exact dimensions of the original, making the result untemperable was another big plus. ( You could not move/redraw walls for example on the copy)

I’ve printed a photo on transparant sheets to experiment with.
(Next time, i’ll take a larger size, and fix the contrast.

The most interesting ones i’ve made today: