This year i used safe fireworks.
A ledstrip ( about 600 leds ) controlled by an arduino.
Only problem is .. there is no sound, but i managed to fix that 🙂
Tag Archives: funny
Rubber duck debugging, Pair Programming and more
Why “rubber ducking’’? While an undergraduate at Imperial College in London, Dave did a lot of work with a research assistant named Greg Pugh, one of the best developers Dave has known. For several months Greg carried around a small yellow rubber duck, which he’d place on his terminal while coding. ( From “The Pragmatic programmer” page 95)
Why rubber ducking?
A very simple but particularly useful technique for finding the cause of a problem is simply to explain it to someone else or even a object. Explain out loud (or in your mind to the duck) what each line of code is doing.
Often while doing so, you will see the problem.
Why Pair Programming?
It is no secret, i like working on a problem alone. Let me do my ‘thing’. But i like the idea of Pair Programming, why?
- Differences in thinking, gives alternative solutions
- 4 eyes principle, typo’s will be seen
- When working with a novice:
- Teaches the new guy
- Give the other space to ask stupid questions, maybe they are NOT!
- The knowledge of the new code is now known to > 1 person!
Making Art using 220V
I have a rol of printer paper that was used by an old 8bit computer. I forgot which one, one out of my collection.
I dont think it is thermal paper, maybe the printer uses electricity just like the movie clip you see below. (Well .. not using 220V directly on the paper maybe) 🙂
Work video-call joke
Using OBS and chromakey (greenscreen)
Stupid bagpipe tricks
Playing two chanters at the same time.
Made a bagpipe octopus
I think it was Burns Night 2005. We took one pipebag, took the drones out. And added one blowpipe and three chanters.
We were struggling to play the damn beast with 4 people.
A picture should exist somewhere, add it when found.
Smallpipe adaptor for two chanters.
Xmas tree lights in the drones
I’ve seen some do this, but never with xmas balls also.
Playing the THX sound
Alternative playing
Above in the movie with two chanter you can see tape.
You can tape other notes, for accidentals.
I’ve started a set with our folkband with my hands reversed.
(Left on the bottom part of the chanter, right hand toppart)
After playing amazing grace, I switched hands every few bars.
Playing high A gracenote with tophand index finger.
Play a tune and slide bottomhand over your top hand down.
Tape or block the bottom sound holes.
Playing with the holes on the inside
CPU / Memory analog meters
Today i used some analog meters to display cpu load and memory usage.
Using below 12 bit DAC (MCP4725 ) and a Wemos Mini
Usage: (Anything you can come up with, if you got a value, you can display it)
curl http://IP/specificArgs?dac_value=$(grep 'cpu ' /proc/stat | awk '{usage=($2+$4)*1000} END {print usage }' |cut -f1 -d.)
Arduino code
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <Wire.h>
#include <Adafruit_MCP4725.h>
#define MCP4725 0x62
unsigned int adc;
byte buffer[3];
Adafruit_MCP4725 dac;
char dac_value_tmp[6] = "0";
int dac_value = 0;
ESP8266WebServer server(80); //Web server
void setup() {
Wire.begin();
Serial.begin(115200);
WiFi.begin("accesspoint", "accesspointpass");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Waiting to connect…");
}
Serial.print("IP address: ");
Serial.println(WiFi.localIP()); //Print IP
server.on("/genericArgs", handleGenericArgs);
server.on("/specificArgs", handleSpecificArg);
server.begin(); //Start the server
Serial.println("Server listening");
dac.begin(0x60); // The I2C Address
}
void loop() {
uint32_t dac_value;
int adcValueRead = 0;
float voltageRead = 0;
server.handleClient();
}
void handleGenericArgs() { //Handler
String message = "Number of args received:";
message += server.args(); //Get number of parameters
message += "\n";
for (int i = 0; i < server.args(); i++) {
message += "Arg nº" + (String)i + " –> ";
message += server.argName(i) + ": ";
message += server.arg(i) + "\n";
}
server.send(200, "text/plain", message);
}
void handleSpecificArg() {
String message = "";
if (server.arg("dac_value")== ""){ //Parameter not found
message = "dac_value Argument not found";
}else{
message = "dac_value = ";
message += server.arg("dac_value"); //Gets the value of the query parameter
int dac_value = server.arg("dac_value").toInt();
Serial.print("DAC Value: ");
Serial.print(dac_value);
buffer[0] = 0b01000000;
buffer[1] = dac_value >> 4; //Puts the most significant bit values
buffer[2] = dac_value << 4; //Puts the Least significant bit values
Wire.beginTransmission(MCP4725); //Joins I2C bus with MCP4725 with 0x61 address
Wire.write(buffer[0]); //Sends control byte
Wire.write(buffer[1]); //Sends the MSB to I2C
Wire.write(buffer[2]); //Sends the LSB to I2C
Wire.endTransmission(); //Ends the transmission
}
server.send(200, "text/plain", message); //Returns the HTTP response
}
Resistor depends on the range of your analog meters
Fun with Xrandr
xrandr is an official configuration utility to the RandR (Resize and Rotate) X Window System extension. It can be used to set the size, orientation or reflection of the outputs for a screen.
Someone broke my screen at a hackers event. The terminal was really hard to read with the black parts, so i tilted the screen
Quiet friday at work, playing with my little trusty 2530p.
I’m using xmonad, so i don’t need any fancy work laptop.
Another quiet friday at work, working from home, i turned all monitoring displays upside-down, sideways, or rotated them every so much seconds.
While this is a lot of fun to use, i used this to get my monitorsetups exactly the way i wanted, at home or at work.
Different screen sizes, height differences .. no problem.
A fun tool to use is:
https://github.com/qurn/xrandr-keystone-helper
Some scripts:
# VGA off xrandr --output VGA1 --off # examples xrandr --output LVDS1 --mode 1280x800 --output VGA1 --mode 1280x1024 --pos 0x1280 --left-of LVDS1 xrandr --output LVDS-1 --mode 1280x800 --output SVIDEO-1 --mode 1920x1080 --pos 0x0 --left-of SVIDEO-1 xrandr --output LVDS-1 --mode 1280x800 --pos 0x1920 --output VGA-1 --mode 1920x1080 --pos 0x2200 --right-of LVDS-1 --output DVI-I-1-1 --mode 1920x1080 --pos 0x0 --left-of LVDS-1 # zoomthingy xrandr --output VGA1 --mode 1920x1080 --panning 1920x1080 xrandr --output VGA1 --mode 640x480 --panning 1920x1080+2910+0 --scale 1x1 # fix detection xrandr --setprovideroutputsource 1 0 # add mode xrandr --addmode DP-1 1440x720 # transform (see also terminal picture above) xrandr --output LVDS --mode 1366x768 --panning 1166x768 --transform 1,0,-200,0,1,0,0,0,1 # Funky stuff for f in `seq 1 9` ;do echo xrandr --output LVDS1 --transform 0.5403,-0.8$(echo -n $f)41,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do echo xrandr --output LVDS1 --transform 0.5403,-0.8$f41,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.1$(echo -n $f)5403,-0.8$(echo -n $f)41,0,0.841,0.5403,0,0,0,1.5 ; sleep 2; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.4$(echo -n $f)5403,-0.8$(echo -n $f)41,0,0.5$(echo -n $f)841,0.5403,0,0,0,1.5 ; sleep 1; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.4$(echo -n $f)5403,-0.8$(echo -n $f)41,0,0.5$(echo -n $f)841,0.5$(echo -n $f)403,0,0,0,1.5 ; sleep 1; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.4$(echo -n $f)5403,-0.8$(echo -n $f)41,0,0.$(echo -n $f)841,0.5403,0,0,0,1.5 ; sleep 2; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.5403,-0.8$(echo -n $f)41,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.5403,-0.8$f41,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.5$(echo -n $f)403,-0.8$(echo -n $f)41,0,0.8$(echo -n $f)41,0.5$(echo -n $f)403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.5$f403,-0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.5$f403,-0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1; done for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.$(echo -n $f)5403,-0.8$(echo -n $f)41,0,0.841,0.5403,0,0,0,1.5 ; sleep 2; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 for f in `seq 1 9` ;do xrandr --output LVDS1 --transform 0.$f403,-0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5; done ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.1,0.1,0,0.1,1,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform -0.11038,0.993888,0,-0.99388,-0.11038,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform -0.11,0.99,0,-0.99,-0.11,0,0,0,1 xrandr --output LVDS1 --transform 0.15425,0.988,0,-0.988,0.15425,0,0,0,1 xrandr --output LVDS1 --transform 0.2,-0.2,0,0.2,0.2,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5,-0.5,0,0.5,0.5,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5,0.5,0,0.5,1,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.54030,-0.841,0.841,0.54030,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.54030,-0.841,0.841,0.5403,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,0.1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,1.1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0.1,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform -0.5403,-0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,-0.841,0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,-0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,0.841,0,0.841,0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,1 --scale 2x2; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0,0,2 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0,0.1,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0,0.841,0.5403,0.1,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0.1,0.841,0.5403,0,0,0,1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0.1,0.841,0.5403,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.5403,-0.841,0.841,0.5403,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.1,30,0.1,0.9,-80,0,0,0.8 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.9,0,0.9,0.9,0,0,0,1 --scale 1.1x1.1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.9,0,0.9,0.9,0,0,0,1 --scale 1.5x1.5 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.9,0,0.9,0.9,0,0,0,1 --scale 2x2 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.9,0,0.9,0.9,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 0.9,-0.9,-0.1,30,0.1,0.9,-80,0,0,0.8 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 1.1,1.1,0,1.1,1,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1 xrandr --output LVDS1 --transform 2.1,2.1,0,2.1,1,0,0,0,1 ; sleep 5 ; xrandr --output LVDS1 --transform 0,0.10,-124,0,1.24,0,0,0.000316,1 --scale 1x1
Password fun and tips
See my other bofh page
Never ask me to reset your password, i you are to stupid to remember or not using a passwordsafe … I WILL give you a new password, and you WILL remember not having to ask me again. 🙂
On this day i drew some example pictures for colleages.
Okay .. now some tips to create uniq passwords for every site in you head.
Want to type faster and not using mouse? .. Press home!
Type website
dirkjan (press home)
(press right) s
(press right) e
(press right) c
(press right) r
(press right) e
(press right) t
dsierckrjeatn <- your passwordOwn made clock
We made our own nerdy clock.
We took a big clock and covered the backplane with modeling grass.
It took about 5 containers to fill the backplane enough to get it nicely filled.
The lettering near the pictures are the RGB representation of the color used in our office.
Lets see if you can decode them all. (use password clock to view solutions!)
Laptop chalkboard
I got bored and attacked my work laptop with a belt sander!
After getting rid of the embedded logo, i took a can of black chalkpaint.
