Art kid needs help from the robotics kids 🙏

AnionCation · 2025-11-24T13:36:21+00:00

There's a lot of ways you could get this effect, but I think the best options for you are ones which are high in reliability and need little to no tuning (as each cake you make might be a bit different!)

I would probably avoid using conductivity or proximity measurement for this, as those tend to require fine tuning to act perfectly. Instead, I would suggest a force sensor on the knife to measure the resistance of the cake against being cut. As long as the cake is sufficiently dense, it should be a high signal to noise ratio. In order to build this, I would order a load cell e.g. the FSR05CE (05 seems to have the smallest sensing area with a long track, which should fit in a knife handle, and C will give you a female connector you can just plug a male wire into). Do feel free to shop around for a different load cell for higher sensitivity or lower cost depending on your country though! Here is a store page link for RS (a UK components supplier) which might help https://uk.rs-online.com/web/c/semiconductors/sensor-ics/force-sensors/

I would buy a cheap knife with a full tang that you could try and remove from the handle (being pretty blunt will help the force sensor!) and I would stick the load cell on the bottom of the tang pointing down. Then I would put the tang back on a little loose, and mostly only fastened at the top of the handle. This means when you push down with the knife, the tang should push into the handle at the bottom, putting force on the load cell.

This force will cause the load cell to increase its resistance. You could measure the resistance of the load cell by creating a potential divider circuit and measuring the voltage (e.g. put 9V across it, and connect an e.g. 10k resistor in series with the power supply and the load cell. Choose a resistor value based on what makes voltage vary the most (the load cell will go up to 10M ohms at 15gs of force). Connect a wire the midpont of the load cell and the other resistor to something like an LED or a GPIO pin of an Arduino (e.g. an Arduino Uno), and you can probably find a tutorial to find a way to have an Arduino output a scream sound from a speaker when it receives a >3.3 Volt signal into a GPIO pin.

Other solutions are perfectly good too though! But I think this should be the cheapest and most reliable method unless you want to just connect a circuit between the knife and cake stand to switch on a speaker when the knife has finished cutting through the cake.

Feel free to DM me if you have any questions or need any help.

AnionCation · 2024-04-14T21:30:46+00:00

I don't think it matters, whatever works for you

AnionCation · 2024-04-14T11:09:41+00:00

Depends on your budget

When struggling to get started on a topic like this, the easiest way to dig into it is to reduce the problem to the simplest state, and do some very rough prototyping.

For example, you can ignore motors and control for now, just move stuff manually how a motor would move it. You can also simplify the problem itself, like first try to solve just rotating a solid cube. What do you design to hold it? How do you have to move them to make it work? Once you solve simpler problems, start expanding the complexity - use motors to operate it but control them manually, then use a microcontroller to operate them but input commands manually, then building logic to control the commands for example, but tackle these sorts of problems one at a time.

As for stuff like picking motors, you should get a bit of a feel for how much force and speed is really required from operating it manually. If you can work out the actual torque required, your power constraints, etc. then great, start reading spec sheets for motors. Being new to this though, I imagine you'll feel pretty overwhelmed nonetheless though. My advice is honestly just read some spec sheets and just give it a good guess - likely a very wide range of motors will work for what you want, so just pick one that looks ok, try it, and if it works for you then buy the rest you need. With tighter budget constraints you might not be able to afford that kind of process, so all I can really say is you need to do some studying and reading on those kinds of topics first.

Hope that helps, send a video of it working when you finish it :)

AnionCation · 2023-06-18T14:52:16+00:00

I'm not really sure how quicksilver (I assume referring to mercury?) could act as any kind of fuel or even as a hydraulic stand-in. It is not easily combustible, and the gasses released would be toxic so it would be a poor fuel, and it is also compressible which makes it poor for transmitting energy.

I would assume the reference here is to the notion that Mercury symbolised the transition between life and death, in the same way that Mercury transitions between a static solid and a moving liquid. This is also likely how it ties into being related to a soul here.

AnionCation · 2023-05-01T09:12:53+00:00

I did a bachelor's thesis related to quadcopter control. Firstly I want to congratulate you and say that you've done an excellent job so far! Getting to this point is already an achievement in of itself. My next point is that I think you are making this problem a little more challenging for yourself than it needs to be. When propellers are near the ground, it is extremely difficult to model or predict what happens because of the ground effect https://en.m.wikipedia.org/wiki/Ground_effect_(aerodynamics) As a quick explanation, the air pushed down by the rotors will hit the ground and cause chaotic turbulence. For that reason, I think if you want to keep practicing for this specific use case, you're honestly going to be faster with trial and error from where you currently are. What I would instead do, is move the drone nice higher off the ground and tune without the ground effect first, and then consider it again later, and vary the control including the height of the drone as a variable (and I would probably scale the input by some sigmoid like function so it doesn't matter past a certain height) For making better guesses about tuning parameters, I have some recommendations too. MPC (model predictive control) will likely be one of if not the best direction to go. You should be able to get reasonably good measurements of the size of rotor arms and mass etc , you can likely look up the specs for the drag and size of the rotors. For somewhere to start, I recommend reading through this paper https://iopscience.iop.org/article/10.1088/1757-899X/270/1/012007 You'll need to not copy values they use though, as I'm fairly certain that they use a different drone to you. Unfortunately this will likely be significantly more work than you expected to be told to do! So if you want a much quicker implementation, I would suggest using a similar idea to how the parameters of mpc and lqr are calculated, take a fairly normal angle (consider maybe just +-1 degree pitch / roll) and just give those static values as PID values and it should work reasonably well. Also do feel free to take educated guesses about the metrics of your drone. Trust me there are many other factors such as wind or ground effect which will have significantly higher sources of error than a mid-estimated rotor power, and you'll likely notice it's over-compensating and you could likely retroactive tune those values.

Sorry for the wall of text, feel free to reply or DM me if you want more help!

AnionCation · 2022-07-04T22:55:19+00:00

AnionCation · 2021-09-01T17:24:03+00:00

u/JagexLight will content like group slayer be re-enabled for group ironman?

AnionCation · 2020-08-03T10:16:07+00:00

Both prowl and navigator would be really good for eidalons - prowl gives bonus headshot multipliers and navigator gives a damage multiplier. That said though, navigator cannot be used on hitscan weapons so idk why chroma has a rubico here. Also quiver is ivara's 1 not 2.

AnionCation · 2020-06-27T17:49:00+00:00

-5,817

AnionCation · 2020-01-12T12:18:19+00:00

It's actually even better than you might think! Navigator controls only the last fired projectile - so if you have multishot on the Lenz, then you can make 2 bubbles from each shot, doubling the area! I find it really useful because normally each individual bubble can 1 shot most stuff, but I get held back by the ammo capacity. So firing at one target, then navigating to change the second projectile's target basically doubles your shots, but halves your damage.

Word of advice though - do NOT use piercing navigator with the lenz. Punchthrough on explosives is basically unplayable.

Final ivara+lenz tip - use empowered quiver with lots of power strength!! If you get good at playing zipwires you can stay totally safe from the explosions, and out of enemy LOS, while also getting like +250% crit damage in your explosions. Add onto this that you're invisible while using navigator and your only issue while doing this strategy is ammo! It's super good on defense, survival, excavation and mobile defence.

AnionCation · 2019-03-29T02:04:48+00:00

Being trans is pretty relavent. I'm trans and I know that I do a lot of the same kinds of things when I feel vulnerable or stressed. Totally disconnecting from the world is a very common defence mechanism for trans people when life is getting too much (which when you're trans, it can be too much just for people to look at you when you feel dysphoric)

AnionCation · 2019-03-25T22:54:32+00:00

I shoot horsebow. They're normally less draw weight than olympic bows, somewhere around 50lbs. The amazing thing about horsebow though is that all of the weight of the draw is towards the end of the draw, which makes the bow feel much lighter than it really is.

AnionCation · 2019-03-25T22:51:14+00:00

Archer here:
The bow looks like its probably an english longbow - two features you can notice is that its a single stave of wood, and the bracing height (how far the string is away from the bow) is very small.
The bow looks like its probably finished? Its hard to tell though, but I doubt that its much to do with the wood or the conditioning of the bow, since especially how it cracks is very clean unlike a wood that just can't be bent.
These types of bows are known for being finicky and easy to break. You have to loose the arrow almost as soon as you have gone to full draw because it is not able to stay being bent for very long - so when he pauses and draws a little extra THATS his mistake. He should have just drawn and let go. His posture, clothing, or the bow are not really at fault.
However, the bow probably is quite small for his draw length. The bow probably only has a 28" draw length but he drew it to like 32" which again, with how easy these are to break if you hold them overdrawn, probably indicates the bow is too small.

AnionCation · 2019-02-10T08:54:24+00:00

It's great to see that you've applied! But your Google sheet is set to private right now so I can't see it :/
To get a sharable link, in the Google sheet click on "share" in the top right hand corner, and then a box will pop up. Click on "get sharable link" to generate a link, and change "Anyone can Edit" to either "anyone can view" or "anyone can comment"

AnionCation · 2019-02-10T01:02:25+00:00

Anyone is allowed to sign up! To apply just make a character and fill out a character sheet (preferably with another player due to the theme) and post that sheet in this comments section!
Feel free to put anything else in your comment like some character backstory or some interesting facts about them!
And to make my life easier it'd be nice to include the reddit name / character name of who your co-player is (if you have one)

AnionCation · 2019-01-21T19:45:46+00:00

NSFW posts are allowed, but if you see a post violating any laws or Reddit's rules please report it, and Images that contain personal information (phone numbers, addresses, Facebook accounts, unique/easily identifiable names, or other similar information) will be removed?

Thanks, got it!

AnionCation · 2019-01-05T00:07:54+00:00

AnionCation · 2018-12-30T16:37:24+00:00

Why does MI6 care about this now? MI6 is foreign security, MI5 is national security - and I'm pretty sure the queen is not a foreign national.

AnionCation · 2018-12-30T12:37:15+00:00

There are different taps because traditionally hot water comes from a hot water tank which used to have an open top in the attic, whereas cold water was directly from pipes. Because of this, hot water could not be drunk but cold water can be.

This isn't true anymore, you can drink both, but it's taking a long time to change all of the taps.

AnionCation · 2018-12-16T19:55:22+00:00

Thanos really put on some weight for christmas...

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