antima55 | adventures in reality

CAT | diy

Mar/10

19

fascinating stuff seen today

cardboard recordsleeve:

analog video feedback - painting with light:

optical microphones:

a technology where you make light into sound primitively and all analog.
heres some links:
http://ericarcher.net/devices/sound-cameras/
http://micah.navi.cx/2010/02/simple-optical-microphonepickup/
http://silentlight.blogspot.com/search?updated-max=2008-12-02T00:42:00Z&max-results=10
and using it in a dj/musician environment:
http://www.umatic.nl/tonewheels.html

diy rfid reader:


my diy vj controller using theremin

its now cripled away and defunct. but it was a fun project.

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today i thought why not use a slide scanner as back on your favorite analog cameras to make them digital. thios would also give high mega pixel.

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Mar/10

5

LED diy lcd projector

ive always thought of lcd projectors as based on an overhead projector with full size lcd monitor screen.

but recently i realized there is another way to do it.
using a small lcd monitor sub 3″ and equipment salvaged from a slide projector plus an ultra brite LED you can make an ok projector for relatively small money.

here is an instructables on how to do just that:
http://www.instructables.com/id/DIY-Multimedia-LED-Projector/step2/Materials-and-Tools/

when building such a device you have to get your hands on some ultra bright leds.
for example a 50 w LED
or a 100W LED

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Mar/10

1

diy variable resistors


for a recent project i needed a lot of linear an rotary variable resistors.
since money is running low i figured it could be nice to make them myself.

for a short experiment i recommend the following instructable:
Make-a-Pencils-Lead-Potentiometer-Experimentation

The best wire to use is nichrome. You may be able to buy a reasonable quantity at a reasonable price someplace on-line. At a hardware store, you can probably buy steel, brass and aluminum wire. For a given wire wire diameter and length, aluminum wire has about 1.6 times the resistance of copper. Brass has about 3-1/2 to 5 times the resistance. Steel will have 10 or 12 times the resistance, but the variation may be wider than that. Stainless steel will have about 40 times the resistance of copper, but may be more difficult to find. Nichrome has about 60 times the resistance of copper.

For example, 100 feet of 18 gauge copper wire will have a resistance of about 0.64 ohms. 100 feet of 18 ga nichrome wire will have a resistance of 40 ohms. 100 feet of 18 ga steel wire will have a resistance of 6 or 8 ohms.

If you want to get a little bit of high resistance wire for little or no cost, take apart an old toaster. The wire may break easily if you try to straignten it out or bend it.
- source

heres a wiki on nichrome
and here is an ebay.com search for nichrome

Alternatively
draw a semicircle with conductive ink or paint
and construct a metallic wiper that wipes over the semi-circle

add two terminals to each end of the semi-circle and you have a variable resistor (a cermet potentiometer look alike)
-source

conclusion:
find a cheap highly resistive strong material and cut shapes in halfcircles for rotary inputs and lines for linear.
make some sort of arm to decide the resistance.
maybe this list can help me.
apparently nichrome is used for heating wire in the foam cutting industry. so it shouldn’t be so hard to find :-)

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Feb/10

28

arduino vhs project case

today i made a project case for my arduino. i was getting too tired of having the arduino and breadboard allways jumping around because of being not mounted on stuff. so i took a look around and stuffed a breadboard plus arduino inside a vhs case:

i also stuffed a stepper motor inside so i could use the whole case for learning to program stepper motors in a steady environment.
it works like a charm and feels ok too, plus there is a lot of space unused inside where maybe a small usb cord plus some solid core jumper wires could be placed there.
to close the case it needs a piece of ellastic wire like a hair string or something.
here is some pictures to show it in function:

picture above shows the outer of the case with an arrow attached to the stepper motor and a paper sticker attached as scale.

here is a picture showing the entire project box:

here is a short tutorial on how to redo this project:

  1. find a vhs case
  2. drill holes like this
  3. place arduino, breadboard and if you have a stepper motor lying around over the holes
  4. put metal wire from the holes over the hardware to hold ‘em down. twist the ends of wire together
  5. hook the arduino up with some programming and do something physical :-)

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