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Apr
11
2007
0

RFIDr Final Project

Project Documentation

Written by Nathan in: Academic, Cool Stuff, MPM22A - Hardware |
Mar
03
2007
1

My Improv LED Necklace

For my physical computing class we were given 2 weeks to make a device that took an input action, gave it a context and then produced an output. We had a list of possible inputs, contexts and outputs and I chose to have dancing as my input, a necklace as my context and colour as my output. I made an necklace of flashing LEDs that turned on and off as the person wearing it danced back and forth. So using the two circuits previously posted (the reindeer antlers and the christmas bulb necklace) I took components and knowledge I learned by ripping the apart and applied it to this project.

I started by sketching out my circuit in a very informal way.

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Written by Nathan in: Academic, Design, MPM22A - Hardware |
Jan
31
2007
1

DIY GPS Device

This is what I really want to do for my geo-spatial class final project (or my Physical Computer) but right now the likely hood of it happening is mighty low b/c ebay auctions can sometimes be tough to win. So what it is a GPS device that normally hooks up to your computer but what you can do to it is mod it so that it doesn’t need a laptop to function. So essentially it becomes an independent tracking device that you can eventually off load the data onto a computer and using the XML files put it into google earth or any mapping software you like. I can dream…

[Link - DIY GPS Device]

Written by Nathan in: Academic, MPM22A - Hardware |
Jan
27
2007
1

LED Necklace

LED Necklace bulbs
So I’m currently working on a short “improv assignment” for my physical computing class and for a long time there’s always been this really cheesy LED christmas light necklace around my house that we’ve always worn for jokes around christmas time. As part of the assignment we have to choose an action, an object and a result from a list we’ve been given and one of the objects we can work with is a necklace. Since the christmas light necklace died this past christmas I thought I’d take it apart and see how it functions so that I could incorporate it into the assignment. I’m thinking I want to try and add more LEDs to it and in a few more colours as well.

LED Necklace Batteries
The most difficult part of the assignment is going to be the power supply. We haven’t really learned how to do battery power supplies yet, I’ve had a fair amount of experience growing up however with using batteries and what not on homemade devices. I might also try and merge the blinking reindeer antlers I took apart earlier as well.

LED Necklace Switch

The necklace itself is made of two thin black wires and a piece of black string spun together. Some of the light bulbs don’t flash and are just plastic while about five are bulbs with LEDs inside of them. Now what makes this wearable is the size of the housing for the components. It’s just a small silver cylinder housing the three 392 silver oxide cell batteries, a small switching device and the controlling circuit board.
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The circuit board is a small circle board with the switch and LEDs soldered on. There’s also a black blob of some kind which I’m guessing holds the oscillator which makes the necklace flash. I think I’m going to try and use the circuit board in my improv assignment or maybe use the controller device from the flashing reindeer antlers.

Written by Nathan in: Academic, Cool Stuff, MPM22A - Hardware |
Dec
26
2006
1

Flashing Reindeer

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I found this extra pair of flashing LED reindeer antlers so being in the true spirit of Christmas I tore them apart to see what was inside. After about 15 minutes of hacking with scissors I managed to cut through the thick sweat shop grade glue (and a wire! oops…) and dug out the six red LEDs.
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The lights were controlled with a printed circuit that had a battery and a switching device that the user would squeeze in order to turn them on and off. What I found most interesting about the circuit was the simple plastic casing around the printed circuit board with a tab to give the user a nice interface to interact with.
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When using the antlers this little plastic case is really what makes the circuit usable, the fact that the user can squeeze it, feel a nice click and then the button returns to its normal state. This is what’s most important for the user…does it turn on and off? This is something to take into important consideration next semester when I’m working on physical computing assignments.

Written by Nathan in: Academic, Cool Stuff, MPM22A - Hardware |
Nov
24
2006
0

Using a 555 chip to turn a 2nd 555 on & off

In my software & hardware production class we’ve recently been experimenting with 555 chips. They act as timers that allow you to use them as oscillators (in our application) and when you mix them with LEDs and some speakers you can have a lot of fun making weird sounds and clicks. Here are two pictures of a 555 chip hooked up to a second 555 chip which turns it on and off allowing for a secondary kind of oscillation. I’ve got it hook up with a pot (variable resistor) that allowed me to modify the pitch or speed of the oscillation depending on where it was hooked up. One of the challenges I had with this circuit was finding the right size of capacitor to use to get a nice tone instead of just clicking. I found that the 220uf, the 0.1uf and the 10uf capacitors gave a nice tone that could be adjusted with the potentiometer. I also experimented with replacing the pot with a photo-resistor that allowed me to wave my hands above it and adjust the sound.

It would be interesting if you had several of these all tuned to the proper pitch and you could wave your hands over them like you would crystal glasses to create a song or just a bunch of interesting musical tones.

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Written by Nathan in: Academic, MPM22A - Hardware |
Nov
08
2006
0

Basic Stamp Building Woes…

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For one of my production classes (Hardware + Software) we have to build basic stamps (Stamp Stack II sx) back in early October. Basic stamps allow you to build circuits on a bread board and control them with some programming code. The annoying part being that it uses old school serial ports :( which means I have to use a USB adapter to hook it up to my Mac. Anyways, I was cruising along putting it together being very careful to closely follow the instructions. I’m soldering away but once I reach the second last component to solder in I realize I’ve soldered my long sip (the long, thin red bar in the picture) too low. Now in most cases this wouldn’t be a problem but ….

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Written by Nathan in: Academic, MPM22A - Hardware |
Sep
27
2006
1

Power Supply & Learning to Solder

So I learned how to solder today, it was a good experience. I had to solder my power supply together for my hardware and software class.It went well once I figured out how long to hold the piece of solder to the soldering iron. It took a while to get used to the solder wire shrinking so quickly once it touched the gun. The power supply allows me to get power to my circuits I build on my breadboard. Then I put it together with a voltage regulator(TIP122) to make sure it worked. Of the three prongs on the barrel jack mate for my power adapter I only use two, the black for ground and the orange for positive.

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Written by Nathan in: Academic, MPM22A - Hardware |

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