Live data from Hacker News

Ask HN: What's the coolest physical thing you've made?

news.ycombinator.com

591–600 of 694 posts

Re: Ask HN: What's the coolest physical thing you've made?

#591

My farm. In the past ten years, I have built the following things here (to name a few that I can remember): 1. three small creek-fed ponds (bonus: one has an island), 2. numerous outbuildings for various kinds of livestock, 3. a pair of portable outhouses, 4. several miles of perimeter and cross fencing, 5. two large greenhouses (20x50 and 30x90), 6. a built-in oak storage bench for the farmhouse entryway, 7. a porta…

What approximate physical location are you in? This is my dream, but right now I’m wasting away in SF. I’ve been looking for properties with a stream but they seem pretty far between.

I own 4.2 acres in the Sierras north of US-50 between Kyburz and South Lake Tahoe at 5,600ft elevation. It was not easy to find, but there is a seasonal creek that runs through it fed by snowmelt. I had to drill a well 600ft down to find water year round, there are no utilities so I had to dig out for septic, get propane storage for generator power, and I have a gravel path via an easement into an adjacent property to link to a forest service road. As remote and unconnected it was, it still fetched an amount that I am not super happy with, but I acknowledge even that price I got it for was cheap. I knew what I was getting into, specifically buying it after the major fire up there two years ago and was able to get a wide open tree-cleared area that I didn’t have to gain authorization to remove. I fully intend to build a cabin up there and then probably resell it because it’s too remote to AirBnB.

I think you should carefully consider your goals and what you want out of a location (must haves vs nice to haves and a list of dealbreakers).

There are a few things you probably take for granted. If your are considering an off grid or at least remote location, some things you should keep in mind:

- More than ten miles is a long way to get groceries, especially if primitive roads make part of the drive.

- It gets dark when you’re outside of civilization, don’t leave lit areas unless you must.

- Carry extra fuel at all times, you should also have a working, spare vehicle that you actively maintain.

- If you are settling in an area with snow, both your vehicles need to be AWD with snow tires and you should carry chains at all times when it’s season for snow.

- The spare vehicle should have a full tank of gas and spare fuel treated with an enzyme to keep it stable.

- You should have spare parts for your home and car, be comfortable with doing a lot of stuff yourself.

- Know the fastest and slower but more reliable route to the nearest hospital.

- Get a cell phone repeater from your cell company (they often even do it for free if you power it).

- Make sure your house has a power inlet so you can use a portable generator in case your permanent one fails or have a very beefy car inverter so your spare card can power your house.

- Have backup fuel for your generator.

- You should have one week of food, water, and generator fuel on reserve at all time.

- Your firewood pile should be sheltered, covered from the elements, and easy to get to from your home.

- Maintain a sat phone (one with minimal minutes is fine, this is backup comms).

And be sure to remember that shit gets or feels weird for us when we live in remote locations. You will start to see things if you let it get to you. If you plan on exploring, be prepared to come across (and avoid) carcasses, wild animals, poison oak or ivy, strange or out of place structures, people walking around who don’t answer or acknowledge you when you call out, trust your gut and fucking bolt when things are just not right even if you can’t put your finger on it.

I have hallucinated people that disappear when you try to approach them, full and partial structures that seem to dilapidate when I approach them. I’ve seen brand new cars driven out miles off the highway left with their door open as if someone just got out and walked away never to return, burnt out cars miles out in the wilderness, heard children laughing in the distance at midnight in the pitch black, heard the moaning of someone in pain but nobody to be found.

Maybe the most unsettling thing is when you walk into a specific area of the forest and, as if all the air is sucked out, it goes so quiet enough that you can hear your own pulse and rumbling of blood flowing through your ear. You feel, not hear, this low, intense hum, a sense of dread falls over you, as if you are being watched or hunted. This happened to me back in May when I ran across a set of poured, concrete stairs in a clearing as if built for a porch, but no foundation where the house should have been.

Nobody told me this lifestyle would cause me to become afraid of the dark again. I used to camp up there but now I don’t go up there unless it’s light and I can be back on the highway well before nightfall. Honestly, this experience has given me a huge appreciation for the game Don’t Starve.

Re: Ask HN: What's the coolest physical thing you've made?

#592
I made a rotary input device that provides software-defined "virtual" detents and end-stops, implemented using a BLDC gimbal motor. It can dynamically switch from completely smooth unbounded rotation, to having detents with configurable spacing and strength and "end-stops" that spring back if you try to rotate past them.

https://www.youtube.com/watch?v=ip641WmY4pA

It's got a round LCD on the front of the knob (wired and supported via the hollow shaft of the motor) and uses the flex of the PCB and strain gauge sensors (in the latest revision, simply SMD resistors whose resistance changes when stretched) to detect when the knob is pressed down.

It's open source hardware and software - https://github.com/scottbez1/smartknob

HN folks might appreciate that it communicates with host software on the computer via protobuf-encoded USB serial messages -- nanopb is awesome for embedded C protobuf support, and having the defined schema, autogenerated serialization code, and compile-time type safety is so much nicer than ArduinoJson or hand-written binary protocols!

I'd love to get it hooked up to some real software eventually (video editors or home-assistant control are my 2 main ideas), but it's really just been a fun project to tinker with and try out some new ideas and parts I've never used before.

Re: Ask HN: What's the coolest physical thing you've made?

#593

I made a rotary input device that provides software-defined "virtual" detents and end-stops, implemented using a BLDC gimbal motor. It can dynamically switch from completely smooth unbounded rotation, to having detents with configurable spacing and strength and "end-stops" that spring back if you try to rotate past them. https://www.youtube.com/watch?v=ip641WmY4pA It's got a round LCD on the front of the knob (wired…

that video of yours just popped up on my YT feed yesterday! did it get "YT-algoed"?

Re: Ask HN: What's the coolest physical thing you've made?

#594

Earlier quoted context omitted.

It depends greatly on where you are. I LOVE airplanes and being in the air, and everything at all to do with aviation, so I once entertained the idea of getting a PPL. I called around to the various local airports and clubs to get an idea of what was involved. Although I could technically afford it, the price tag was eye-wateringly expensive for what would realistically amount to an expensive and non-trivially danger…

> I took up an interest in motorcycles instead. Can you expand on this? I am a motorcyclist with an interest in flying and based on my idea of what flying involves (at least in not very busy areas) it seems a lot more chill and probably less dangerous than motorcycling. Multiple people try to kill me every day the mental load involved in managing all the hazards is quite high.

It's more arbitrary data than riding, mostly while communicating with ATC. You have to remember various details spoken to you moments ago and process it all while managing the plane. It is obviously very doable, many do it.

It depends on where you ride but the mortality of private pilots is comparable to riding when messuring risk vs hours of exposure. I don't have time to fetch the data right now but I recall that from when I was looking into getting a bike.

The risks are very different, pilots die from lack of preparedness, riders are at the whim of traffic and their moment to moment risk taking behavior.

Re: Ask HN: What's the coolest physical thing you've made?

#595

I'm an EE by trade, and my work has shipped in numerous consumer products. I was lead hardware designer for Sonos Amp, Sonos Port, and a few of the IKEA/Sonos collaboration products. I've since moved on from that job, but it's a very cool resume item. It's also a pretty cool shameless self promotion thing to point out when I need to. Was asked by an executive why I should run a hardware development effort at my curre…

I made an instructable on how to hack the sonos ikea speaker to get a line level aux out. What do you think of it? Imo its probably wrong electrically speaking summing the low and high frequency lines, but it sounds pretty good after truplay tuning.

https://www.instructables.com/Cheaper-Sonos-Architectural-Wi...

Re: Ask HN: What's the coolest physical thing you've made?

#596
post #140

Earlier quoted context omitted.

Best no-word, visual, intuitive explanation of how CAT scans work ever!

I'm not sure I'd be able to figure it out easily if I didn't already know how a CAT scan works, but I agree it's a excellent demonstration of the principle

Not knowing how a CAT scan works, beyond a vague intuition from already knowing what the acronym stands for, and not wanting to look it up before making a guess: can I assume it’s akin to this, in that radiation is shot from an emission source, through the target, to a detector on the other side, with the density of the material attenuating the signal in predictable ways, from which we can apply a transformation to some large number of such measurements to achieve a computed 3D result?

Re: Ask HN: What's the coolest physical thing you've made?

#597
post #591

Earlier quoted context omitted.

What approximate physical location are you in? This is my dream, but right now I’m wasting away in SF. I’ve been looking for properties with a stream but they seem pretty far between.

I own 4.2 acres in the Sierras north of US-50 between Kyburz and South Lake Tahoe at 5,600ft elevation. It was not easy to find, but there is a seasonal creek that runs through it fed by snowmelt. I had to drill a well 600ft down to find water year round, there are no utilities so I had to dig out for septic, get propane storage for generator power, and I have a gravel path via an easement into an adjacent property t…

It would be interesting to figure out scientifically why places like the one you mentioned cause this kind of effect on the human brain.

Re: Ask HN: What's the coolest physical thing you've made?

#598
post #512

I took a Shapeoko 4 Pro CNC, which is a belt driven machine, and redesigned it around ballscrews for the X and Y motion. I reverse engineered the stock machine and rebuilt it in CAD, and made the new parts using the existing Shapeoko. It was made out of 6061-T6 aluminum, and some 3D printed components. I'm also pretty happy with some of the cutting boards I've made: https://www.longtailwoodcraft.com/images/cube-board…

Wow! I like what you did with the CNC and your cutting board looks really cool!

Re: Ask HN: What's the coolest physical thing you've made?

#599
post #9

Animated laptop stickers. https://shkspr.mobi/blog/2020/06/building-a-minimum-viable-l... First time I've ever built and sold something physical. Amazed at how many people liked them.

That's awesome! I would love to buy one if there are any available.

Re: Ask HN: What's the coolest physical thing you've made?

#600
I built 2 muskulokeletal humanoid robots with my team. They use tendons to imitate the human muscles. It's also probably the most hugged robot in the world, as we let people hug them at events, which significantly helps dispersing fears of robots. One of them is now a permanent exhibit of the world's largest science museum in Munich. [1] Also university of Oxford has a shoulder using it to grow human tendons.[2]

[1] https://devanthro.com/story/ [2] https://www.nature.com/articles/s44172-022-00004-9

Post reply on HN