so this is an interview question for a programmer:

swap two variables without a temporary variable

well

a=3

b=5

a=a+b

8=3+5

b=a-b

3=8-5

a=a-b

5=8-3

a=5

b=3

greetz WV

cool, its still as simple as the last time I tried, well lets see what all leads from here :)

greetz WV

Life Hack #3127: DIY Airconditioner

hate the heat or do something about it... I chose latter :D

greetz WV

first real print test

-hardware works on long runs... check
-software is stable for now... check
this looks actually ok to me. now some better coding and the results are actually usable (just 6 layers here) :D

greetz WV

3D Printer Prints...

finally...

greetz WV

Yay, hacking phones...

this time with a Sony Ericsson Xperia Arc S lt18i

this gets fun with time

greetz WV

Its alive!

First test of my gear belt driven bridge :D

greetz WV

Voltage Measuring over USB

yay, with a simple resistor divider I can measure the temperatur of my sensor (variable resistor), this way Ill be able to make a better heating controller :D

greetz WV

3D Printer over USB

finally I had time to rewrite my software for the stepper motor controller card, so now I can use it over my USB IO board/expansion board. Now all that is left to do, is the additional stepper controller (my circuit), but I guess I forgot to buy some parts for it, so it will take a while... and then yeah, build the damn mechanics!

greetz WV

Expansion Board IO

Here a demo of using my Expansion Board for IO

greetz WV

Expansion Board

yay, finished my expansion shield for my IO board, so now I have access to data0-7 and strobe on parallelport! this way I can do usually LPT bitbanging or in my case control a stepper motor card!

greetz WV

And done! added the other 12 pinouts, some hotglue to the usb port and made some "feet" out of the hotglue... works 1A!

greetz WV

USB 4 All

finally all parts arrived, and I could solder the first time this year :D this is my all-in-one-IO circuit, after sprut's USB4All circuit and firmware (source) also wrote a little testprogram to flip a LED on/off

greetz WV