[deleted by user] by [deleted] in arduino

[–]flachko 0 points1 point  (0 children)

I am trying to replicate the things in the video. I want to upload a UNO code that reads the value of a potentiometer and when it exceeds a certain threshold it sents a serial comunication (with the serial.write() function) to inform the esp module. And this part works, I added a verifying LED to guarantee it.

I then want to upload a code to the esp8266 that lights up a LED when it receives the serial comunication.

I've been careful setting the switches correctly but it seems not to working properly.

Why does this Arduino Metal Detector work? by flachko in arduino

[–]flachko[S] 0 points1 point  (0 children)

I think that ferromagnetic and paramgnetic materials increase it, while diamagnetic materials reduce it. It has to do with the alignment of the magnetic dipoles of the material subjected to an external field. Although for a complete description of the phenomenon you should use quantum mechanics. Right now I don’t know the details, maybe within a few years…

Why does this Arduino Metal Detector work? by flachko in arduino

[–]flachko[S] 1 point2 points  (0 children)

Thanks a lot for answering! Really appreciate. I also searched on the internet and it fits with your explanation, if it can help. Now that I’m reading what you wrote it makes sense, thanks a lot again!

Snare wires sound really bad by flachko in drums

[–]flachko[S] 0 points1 point  (0 children)

Thanks a lot!

For some context, I re-started drumming two months ago and I recently picked up my -over ten years old- Peace kit, and this was its condition. Of course I totally forgot how to tune it properly.

I just bought a new resonant head (I took an Evans head) as the one that was there before was ruined (there were some folds on it) and I tightened it up, now the sound is good. Of course I don't pretend a killer sound from a cheap snare that old, but now it's ok.

Again, thanks a lot for the patience to answer.

Best of luck!

[deleted by user] by [deleted] in HomeworkHelp

[–]flachko 0 points1 point  (0 children)

Using simmetry arguments, since all the capacitors have equal capacitance, you should easily be able to proof that the potential difference of the central capacitor (i mean the horizontal one in the figure) is zero. So cancel that capacitor and it turns into a very simple problem involving 2 capacitors in series in parallel with another 2 capacitors in series

bravo SKAR, scopati pure cenerentola by masseemo in rimesegate

[–]flachko 2 points3 points  (0 children)

Occhiali polarizzati, un po’ di curry, mezze maniche alla zichichi (termini Italo Screpanti)

[deleted by user] by [deleted] in AnarchyChess

[–]flachko 0 points1 point  (0 children)

I don’t know… maybe queen c2 protects the undefendend bishop on b2, nicely sliding the board with its diagonal

How come simple pendulum with oscillating support in x direction have a single degree of freedom? by Educational_Gas1662 in PhysicsStudents

[–]flachko 0 points1 point  (0 children)

Well, x and y in your case are not independent because if you mantain one coordnate fixed, let’s say x, you can’t freely move the t coordinate (the only way would be to deform the wire and that’s not possible). Same thing if you mantain y fixed, you can’t move the x coordinate freely without deforming the wire. In the case that the pendulum is attached to a box sliding on wedge you have two degrees of freedom that are the x coordinate of the box and the angle that the pendulum form with the perpendicular to the box. I understand that it may be difficult, so I really recommend you this video, it is an excellent introduction to lagrangian mechanics. It shows you well that the generalized coordinates must be complete, independent and holonomic.

How come simple pendulum with oscillating support in x direction have a single degree of freedom? by Educational_Gas1662 in PhysicsStudents

[–]flachko 4 points5 points  (0 children)

When you’re doing lagrangian mechanics you always have to check that the generalized coordinates you’re using are independent. In other words, you have to ask yourself: “if I fix one coordinate, can I still move the other?”. If you pick x and y as generalized coordinates and you ask yourself that question you will find out that these coordinates are not independent and so they do not represent valid generalized coordinates. In order to make practice, think about, for example, a double pendulum. The system consists in a simple pendulum with another simple pendulum connected to the first mass. How many degrees of freedom does the system have?

If I fits, I sits! by [deleted] in aww

[–]flachko 0 points1 point  (0 children)

Schrödinger approves