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What's the Coolest Thing You've Ever Built?
Josh Lindenmuth asks: "In high school I was involved in an engineering competition where we needed to create a machine that could move 100 lbs of groceries from a disabled person's car up and down a set of stairs, and then into their kitchen. It was probably the coolest thing I ever built (there were only 3 of us on the team), even though the wooden treads started splintering halfway up the stairs (we didn't have a metal shop, so it was made entirely out of wood, spare boat parts, and conveyor belts) and then it completely destroyed the stairs on its way down (it weighed over 300 lbs)." That's Josh's story, now he wants to know yours. Cool computers, cars, hovercraft, handheld devices, fusion reactors — what is the most interesting gadget, product, or device that you've ever built on your own?
Period!
There was that one time I built a machine that could propel cats to the moon. It almost worked, too.
One time I made a "Jump to Conclusions" mat. You see, it was this mat that you would put on the floor... and had different conclusions written on it that you could jump to.
My first semester at UW Madison my Introduction to Engineering class buit a BioDiesel Reactor. It was 18 freshman students who knew nothing about biodiesel, and by the end of the semester we designed and constructed the reactor. I was involved on the team that designed and executed a safety system that monitored the temperatures inside the reactor tank, if the temperatures exceeded 60 degrees celsius a relay shut off the heating element in the reactor. This was one section of a larger lecture, and all other projects pailed in comparison. We also had a $500 budget which we exceeded by $4500, the project was paid for by a department at a technical school in Madison.
Feet tend to distribute wait in a nice, convenient way. That, added to the fact that muscles allow us to slowly descend our feet to contact the step. A 300lbs robot composed of wood, probably does not have this feature. Plus, wood is much harder than flesh (duh). Get a 300lbs pirate with wooden pegs for legs and watch him fuck up your stairs in a few weeks.
With a friend I built and wrote an IM client that worked between two TRS-80 model I computers. We "networked" them together by connecting the tape drives between each other (needed an amplifier), and cross connected the "send" and "receive". Then we wrote software that accepted input, sent it across the tape drive, then listened for a message from the tape drive.
It worked well, but of course was very slow.
Then there's the joystick-controlled typewriter...but that wasn't as cool.
As a freshman in the danish "gymnasium" (which is senior year of high school + 2 years of college), we had
:-)
an project in physics class where we could write about anything we wanted to. As a group of three students
we chose to write about digital logic. In the beginning, we only planned to write about digital logic theory,
circuit design theory, and so on, but we soon realized we wanted to build an actual circuit design.
After spending days or even weeks designing the thing, we finally had our ÜberMachine - we called it the
DALO (Digital Arithmetic and Logic Unit). It was essentially an ALU with support for addition, subtraction,
logic "or", logic "and", and logic "not".
Now, in this day and age of computers, it would take most programmers just a few minutes to make such a program
in most programming languages. But this was done entirely in hardware, with no fancy integrated circuits! We
used about 15 simple chips (classic phillips 74xx-series), which only contains or, and, not and the occasional
full-adder.
For the input, we used manual flip-switches, connected directly to the input legs on the microchips.
For output we used a series of LEDs to output each of the 4 digits in the A-input, B-input and the result. At
the same time, we used a classic 7-segment display for each, driven by a 7-segment-decoder chip.
In the end, the things actually worked, which was quite amazing to see. We hadn't received any formal training
in digital logic, electronics, or circuit design - and yet it worked. The entire machine was soldered with more
wires than I ever wish to see again, and it took a lot of blood, sweat and... time - but we did it!
Some years later, I was employed as a teaching assistant at the university. One of my classes were in machine
architecture, a course which most students couldn't see as relating to reality very much, because they didn't
believe anybody except large companies could build computers or circuits. On the day of my last class, just a
few days prior to the exam, I brought our high school project with me, and showed them how it was built.
Several of them were amazed by it, and it really seemed to make a difference. Computers were no longer magical
devices crafted by dwarven builders, they were simply complex machines, free for anybody to build.
That's the greatest thing I have ever built. Now, if we were talking about programming, that would be
another matter...
With great numbers come great responsibility!
A few months ago, I started learning electronics. My first project is (electronically) complete - it just needs some finishing off to the housing.
It's a Nixie tube display, with 7 nixie tubes. I built an RS-232 reciever/sender out of 4000-series logic ICs (not a CPU or microcontroller in sight) - mostly counters and registers, and a few AND gates and inverters.
Pictures of the project's progress are at http://www.alioth.net/pics/nixies/nixies.html (two pages of photos - the working project is on page 2). I've also kept a journal of building and learning in my Slashdot journal.
The hardest part of it was probably getting the 170 volt switch mode power supply to work correctly (mainly getting it to regulate) and not put so much noise back into the 5 volt supply to cause latches and registers to lose their values. Some help from the NEONIXIE-L group on Yahoo was invaluable here, and I now have a decent 170 volt supply.
I'm now learning how to make things with microprocessors, and once I've done some breadboard experimentation, my next project is to build a logging weather station for the glider club, using a Z80 processor, a flash EPROM, some RAM and probably compact flash for mass storage (not that it'll use a lot of it!), and a small graphics LCD module for display. Currently, I'm at the stage where I've breadboarded a very basic Z80 system that can output values on a crude output device. But it works!
Oolite: Elite-like game. For Mac, Linux and Windows
I think the coolest thing I ever built (or designed and programmed) was a self-contained turntable system for an automated monorail part transport system. The thing had multiple stop points that could be programmed, automatic homing, and built-in accel/decel ramping. Used a mini handheld pendant to program the stop points - you could literally walk under the thing and see the alignment as you made your adjustments.
To the best of my knowledge, it is still in production at Caterpillar today. It was designed and built in 1998.
The second best coolest thing I ever built was some software for interfacing a Linux based PC to an Allen Bradley ControlLogix PLC. The real cool bit is knowing that this software is being used in multiple production facilities around the world from making baby formula in Canada to being used in a mix simulator for the AirBorne Laser program.
Ron Gage - Westland, MI
I built a 2 tap Kegerator with a tile counter and a computer to weigh the kegs and tell how much beer is left in each keg. Check it out here http://photos.yahoo.com/melendez_21 I also installed a glass door to keep liquor cold with a black light.
I've built a few things I really liked:
1. Building an airplane (200+mph 4 seater version of a Burt Rutan design)
2. Flamethrowers (the response time of the Culver City police department to 40+ foot flame mushroom clouds is 5 minutes)
3. TankCams - I've explored the crawlspace under my house from the comfort of my living room via teleoperation.
4. A couple of neat costumes, this year I was written up on slashdot about my Aliens walking forklift costume.
5. An inertially coupled autopilot for R/C planes I built years ago as a cheap UAV so I could send a plane someplace, take pictures, then have it fly itself back, all without crashing.
There are lots of cool things to do out there, I'll be dead when I stop working on them. Instead of being a "remember that time back when I was held the football record at Polk High" thread, I hope this thread focusses not just on past accomplishments, but also mentions things people are still actively doing, otherwise it'll be terribly depressing.
While I was a Junior/Senior at Everett High School, (Lansing, Michigan), I built a tunneling scanning electron microscope. We originally followed/used a kit from the University of Muenster in Germany that I had learned about from Slashdot. Unfortunately, the documentation sucked, the circuit board was etched incorrectly and there was a design error. Furthermore, the control software was written is visual basic and was nothing more then a toy.
;)) to support accelerated Nanotechnology development and commercialization while also encouraging applied and basic research. Michigan State University and the surrounding universities are home to world class researchers and students working on Nanotechnology and Nano-Biotechnology. It has been decided that it is time the state began to leverage that asset to create a bright 21st century future for our citizens.
With the help of a electrical engineering group at Michigan State University we overcame the problems and I decided to modify the original design to use GXSM, a powerful open source electron microscope software package that is Linux only. This required adding a sranger digital signal processing board and stepping up the input/output voltages for the piezo crystals. Amazingly, almost all the work was done by myself or fellow students, MSU only guided us in understanding the circuit diagrams, making small adjustments, fixing the errors in the plans and designing/building the stepping circuits for my modifications.
I have some really great memories, spending all day in the basement lab I had set up, eating pizza while skipping all my classes with permission from the principal, "accidentally" burning my long time enemy with the soldering iron, ripping a chunk of my finger off jumping a network wiring cage to connect the main computer to the internet.
Working with the electronics and science was very interesting, but the most valuable experience came from lobbying for the funding from local government, assembling a team of fellow students to work on the project and starting a Nanotechnology elective class to actually use the damn thing. Eventually, former State Senator Virg Bernero (now Mayor of Lansing, Michigan) convinced BioPort (the company that makes the Anthrax vaccine) to provide the majority of the funds.
The project eventually inspired local university and government leaders (I wouldn't stop bugging them
I'm 19 years old, and thanks to the Slashdot article "build your own electron microscope" I've actually become something I'm proud of. I've built a tunneling scanning electron microscope, lobbied for funding and government support, founded a Nanotechnology class at Everett High School with help from a amazing science teacher who now is inspiring the class to even greater things while developing a soon to be accredited curriculum, hired as a contract consultant by a company in silicon valley, been sent overseas, all expenses paid to a nanotube conference in Japan by the same company and I now work at M.S.U. as the only employee in a new Nanotechnology supporting office at the college of Engineering. (There is also some other stuff I'm not allowed to speak of.)
I've met very important people from NASA's JPL, IBM, Oxford, Harvard and founders/pioneers of Nanotechnology.
In my free time, I lobby for the creation of a Michigan Institute of Nanotechnology, which will become the center of Nanotechnology in the state, facilitating the cooperation of private industry, research, academia and government to create jobs, businesses, breakthroughs and secure a portion of the world economy for ourselves. It already has a extremely wide and powerful base of support.
Not bad for someone who graduated with a 2.5 GPA.
You work for Microsoft, don't you?
That reminds me of a joke:
A scientist goes to God and says, "We don't need you anymore. I can create a human from nothing more than a handful of dust."
"Alright then, let's see," God replies.
"No problem," says the scientist, and he bends over to scoop up some dust.
"Hold on," God interrupts. "Get your own dust."
This space intentionally left blank.
When I was in high school, I built some parts for the temperature regulation system of the AMSAT Phase 3D satellite. 288 tiny aluminum parts, each about 2cm long, and 0.1mm tolerance on all measurements. We used the school's CNC milling machine, but I had to hand-write the CNC code to do the parts in four passes, because the CAD/CAM software wasn't up to it. We then we hand-polished the parts to get them within tolerance where possible. The satellite is still in orbit, it shows up in J-Track as Oscar 40, but apparently it doesn't work anymore.