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Werewolf Wu
Приєднався 23 бер 2022
Who I am: an Asian Werewolf, commuting between the Bay Area and the Sierra Nevada Foothills.
What I post: Anything I find useful, fun, interesting, intriguing, thought-provoking, such as (but not limited to):
* Interesting facts / fun facts about history / architecture / technology etc.
* Engineering Tips.
* Philosophical discussions (meaning of life, why are we here, how to live this life etc.).
* DIY projects around the house.
What I post: Anything I find useful, fun, interesting, intriguing, thought-provoking, such as (but not limited to):
* Interesting facts / fun facts about history / architecture / technology etc.
* Engineering Tips.
* Philosophical discussions (meaning of life, why are we here, how to live this life etc.).
* DIY projects around the house.
Chichén Itzá Bird Echo Sound Acoustics fully explained! How does it work? Chichen Itza
Chichen Itza Bird Echo Sound Acoustics fully explained! At Chichen Itza, Mexico, there’s this mysterious Mayan pyramid that can turn your hand clap sound into a bird chirp sound! How does it work? Watch the video to find out!
This bird echo sound can be fully explained with simple geometry, proven with a computer simulation.
Chapters:
0:00 Introduction
0:17 Echo Sound Overview
1:36 From Clap to Tone
2:12 Bird-Like Effects
2:45 Dropping Pitch Effect
4:26 Dropping Volume Effect
4:49 Analysis Summary
5:18 Computer Simulation
5:30 What About Other Stairs?
5:59 Build Your Own Pyramid?
6:51 How Did They Do It?
This bird echo sound can be fully explained with simple geometry, proven with a computer simulation.
Chapters:
0:00 Introduction
0:17 Echo Sound Overview
1:36 From Clap to Tone
2:12 Bird-Like Effects
2:45 Dropping Pitch Effect
4:26 Dropping Volume Effect
4:49 Analysis Summary
5:18 Computer Simulation
5:30 What About Other Stairs?
5:59 Build Your Own Pyramid?
6:51 How Did They Do It?
Переглядів: 1 486
Відео
FREE touch buttons for your Arduino!!!
Переглядів 862Рік тому
Want touch buttons for FREE for your Arduino project? You got it! This type of touch button requires NO extra chip, uses ONLY STANDARD Arduino functions, and is easy to make! Have a question/comment? Drop me a note in the comment section!
3 Tricks for getting a Better ADC for FREE! (Arduino)
Переглядів 1,4 тис.Рік тому
3 tricks to improve your Arduino ADC for free! Trick 1: use a better reference (don't use the default unless you REALLY have to!) Trick 2: Calibrate your reference value! Trick 3: Take a lot of samples and take the average! Hope you find this video informative AND entertaining! Got a question or comment? Let me know in the comment section!
4-20mA sensor explained with a simple Arduino example!
Переглядів 35 тис.Рік тому
How does a 4-20mA sensor work? How to use it with an Arduino? In this video we explain what a 4-20mA sensor does and how to connect it to an Arduino with a simple example. Github link: github.com/WerewolfWu/420mAsensor Have a question / comment / suggestion? Let me know in the comment section, let's talk!
季姬击鸡记 Ji Ji Ji Ji Ji Ji Chinese poem with a single syllable
Переглядів 4,9 тис.2 роки тому
同音文《季姬击鸡记》作者：赵元 原文： 季姬寂，集鸡，鸡即棘鸡。棘鸡饥叽，季姬及箕稷济鸡。鸡既济，跻姬笈，季姬忌，急咭鸡，鸡急，继及几，季姬急，即籍箕击鸡，箕疾击几伎，伎即齑，鸡叽集几基，季姬急极屐击鸡，鸡既殛，季姬激，即记《季姬击鸡记》。 Miss Ji was bored (another possible translation would be “daughter number 4”) So she got some chickens to pass the time, the kind of chicken that live in the bush. The chickens got hungry, so Miss Ji used a bamboo pan to feed them rice. After the chickens were fed, they jump...
施氏食狮史 Lion-Eating Poet in the Stone Den, Chinese Poem in Mandarin
Переглядів 5 тис.2 роки тому
The Story of Mr Shi Eating Lions, a.k.a. Lion-Eating Poet in the Stone Den is a long form single-syllable Mandarin Chinese poem composed entirely of one single syllable: “shi”. It was written by a scholar named Yuanren Zhao as a mockery of the romanization of the Mandarin Chinese pronunciations in the early 20th century, an effort that he did not agree with. In his opinion, the Romanization got...
4-20mA is also nice for fault detection
Indeed!
Wow what an informative video, veeeery indepth. You are a great himan 😊
Glad you find it useful!
So interesting, thank you for explaining! 😊
My pleasure!
Once I was searching about the infamous《施氏食狮史》 on the Internet I came across the poem that you introduced here. After that, I found a UA-cam video about it, but the most absurd thing is that the first part of the Chinese Test in the video was the DICTATION exam of 《季姬击鸡记》, and the minimum point to continue the test was thirty. Can some native Standard Chinese speakers or someone major in Chinese language like me pass the dictation? I wonder... Link of the video in question: ua-cam.com/video/xhMERt-lCZw/v-deo.htmlsi=Cfw7WQcq87HfSiAo
I can't speak for other people. But I can't...
Interesting, but if it is like you say, a simple echo and because of the number of stairs, why can't it be heard the sound in the four sides? and you can say, maybe because the thing it has on the top... which is strange because it is heard the same sound on two sides ....
Anything is possible. This is just one theory. There are of course other theories too.
Our tour guide said it was to sound like a certain bird that Mayans thought looked like a feathered serpent, Kulkukan. He was of Mayan descent.
That's what I have heard too.
Thanks! Thanks to your video i was able to hook up a 16Bar pressure sensor to my arduino. For some reason my pressure was running from 4mA to 12mA full scale. Also first time i measured 2mA with 0 pressure, after having applied pressure 1 time , funny enough it showed 3.95mA when no pressure was applied. So then it was working as expected. But the max stayed 12mA. The same sensor PT506 exists also in a 25Bar version, maybe they mislabeled mine? However after changing the formule it worked like a charm and the Arduino showed what i was reading on the pressure regulator. Thanks your video was awesome and clear and helped me how to connect 2 wire sensors. So i learned something new. Much appreciated!
Glad you found it useful!
So does this mean there were some Fourier transform involved? If some steps were raised or lower, made thinner or wider, would it produce a different sound? You could technically make any sound wave using Fourier transform like with music synthesizers. Is that what is happening here but with a clap sound? Could it be done with other sound instead of a clap? Could some sound be easier to transform than other into certain sound or some limitation to what the sound could be? If instead of 91 clap echoes but 1000 echoes and if you slow it down and change the pitch or frequency of those individual clap sounds, you can make it sound like some other sound wave. That is what I'm guessing you can do. The simulated sound in the video sound like a low quality version of a sound wave (bird chirp).
What physically happens here is a convolution of clap sound and the impulse response of the pyramid reflection. Then you can apply that knowledge however you'd like.
Thanks
You are very welcome!
Can you make a video connecting Pixsys on a pressure sensor please?
Where's a video about calibrating this sensor?
This is a great video, thanks
Glad you found it useful!
Great video!
Thank you! Glad you find it useful!
Thank you Werewolf, I have a question, if I wanted an echo with a constant frequency, could I just gradually change (slightly reduce) the length of the steps as I build higher ? Thank you and my best regards from France.
That would be one way to do it. It'll be quite expensive though so better to keep it as a curious mental exercise.
@@werewolfwu Thank you.
I got it from Jeff Bezos establishment was actually funny. (Amazon) 😂😂😂
😂😂😂 Didn't want to directly name the establishment
Want more videos
On it!
Hi! Very interesting video on a really surprising effect! I have a few questions related to this: 1) You are saying that wave diffraction is happening here : to what extent would this affect the phenomenon? 2) The 2D geometrical analysis you made was really convincing! I am surprised that the length of the steps doesn't influence the phenomenon : would a 3D-consideration change anything on the results? I mean, if you used a really small length of the steps, but the same height and depth as the pyramid, would it give the same results in situ ? 3) After watching your video, I noticed it was possible to produce the same effect on a large construction site fence (with small "steps" of 3 cm), but not on a small staircase of roughly 90 steps (1 cm for height and depth). Since both structures are really thin, would acoustic impedance have a role in this effect ? Thanks by advance if you can help me understand this !
Glad you found it useful! To answer your questions: 1) diffraction serves to disperse the reflected sound wave so that you can hear the echos from where you are standing. Without diffraction, the sound will reflect off the higher stairs and simply go up and away from you and you won't hear it. 2) Length of steps very much matters. For sake of simplicity I'm only talking about the case where step height = step length/depth. 3-D model WILL CHANGE things to a certain extent, mostly in the "color" of the sound, but the basic idea is the same. 3) This effect is akin to diffraction grating in optics, so with different step size you get different frequencies. at step size of 3cm, the frequency you hear is about 5.7kHz, that is VERY HIGH frequency! At 1cm step size, the frequency is now 17kHz! Most people cannot hear this frequency clearly. I know I totally cannot, proven with experiment. Hopefully this helps!
@@werewolfwu Thanks a lot for your really clear answers! I'm sorry for wasting you time, other questions are coming to my mind : 1) For example, would it be possible to emit other sounds, like a monofrequency signal ? Because based on the geometrical model, the gliding pitch effect would still occur... but I have a feeling such a thing wouldn't happen in situ (if so, why ?) 2) Does the duration of the signal have an importance ? Or do you think interferences would happen if it is too long ? 3) And are you planning to do a video to explain diffraction effects on this pyramid? The explanation you gave was really nice and I would be pleased to learn more about it applied to this context!
Glad you like the answers! 1) yes, it is totally possible, as long as you have the right geometrical shape. 2) the duration of the incident signal is important (short, ideally a pulse, hence clapping sound is ideal) for ease of analysis if you are trying to use echos to emulate something (like a bird). The duration of the echo signal is important for human perception, meaning if it is too short it cannot be perceived. 3) that seems to be a topic that is too esoteric to be made into a video at least for now. There are a lot of other interesting things to talk about in this world.
Werewolf Wu face reveal 😮
LOL! That is decidedly NOT what this video is about :-)
Amazing. In case somebody doesn't know, this poem is written in Classical Chinese, when pronounced in Mandarin it's incomprehensible by listening.
Thanks!
Plus, the author of this poem is Zhao Yuanren (赵元任), who insisted on Romanization of Standard Vernacular Chinese, or Baihua (白话). Also this poem shows that it is inappropriate to write Classical Chinese (文言文) in Roman letters while it is okay to use Roman letters regarding to vernacular Chinese.
Hi Werewolf, thank you for sharing such a good content. Btw, do u have the follow up topic on ADC? Thank you!
Which specific aspect of ADC? Perhaps I can help you out in the comment section first. Let me know what you'd like to know about ADCs. We'll see who answers it better: human or AI.
sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
《戚咠 棄妻》 戚咠 集七漆器 漆器漆悽悽 妻氣棄 戚咠 氣妻棄 戚咠 棄妻 戚咠騎雞七里 離妻 抱歉我才高中生國文程度很爛寫得不太好，請各位多多包涵我也在試著寫出更好的詩 感謝大家
that's pretty good!
Saying gg to gamers:
LOL!
Great informative video. You need to make many more. Your style of explanation really makes sense. Certainly better than most I have seen. I am a newb at arduino programming and your 4-20ma video and this one just make sense now
Much appreciated!
I built a "very analog" LED bargraph water level indicator. (A vertical pvc pipe set-up with 10 reed switches outside "encapsulated in silicone" inside the 1' pvc pipe a Styrofoam float with a neodymium magnet on top) Besides the disadvantages of a myriad of wires (I used cat6 cables) the water would eventually seep through the silicone and cause "erroneous readings" This will help me set-up a single wire pair to the sensor, now I will have to figure out what IC to use to feed the LED bargraph. Thank you so much! 😊
Glad you found it useful!
😮In Brazil, a poet wrote a text where all the words started with the letter P. It's called "Brasil with P". I was already very impressed with this, but Mr. Shi and the lions went further.
haha!
😮😮😮
:-)
🤣🤣🤣
Hi, thank you for detailed explanation. Do you have idea how can we wire two (or more) sensors like this? How to isolate inputs? Thank you.
You would need one power supply and 2 return paths to carry two signals.
Werewolf Wu, good job on the explanations. I am also pleased that I am not the only one who hates it when manufacturers and individuals fail to follow the rules for upper and lower case letters when showing metric values. I even worked with a company for several years where the engineers knew better, but the company 'hard rule' was that all printing on drawings and stamped onto products MUST be in upper case, so milli always became mega, etc.
Mega Amps!
or use a precision voltage ref ic!
If I were to spend that kind of money, I won't use the cheap internal ADC :-)
flakey! oops, i ejected!
:-)
great job, thanks for making the code available. Now, for an IoT example using esp32...
:-)
Jeff's establishment 😂😂
because it is :-)
Much cheaper replacement for scata and smart boxes
indeed!
1:20 MA 😂
I know right?
Thanks for the video,I have built the same circuit with a water flow sensor, but the output signal has a fluctuation.how can i fix this problème i used ESP32
Start with power supply, follow the signal flow, check power supply and signal flow chains at every point.
competitive gamers after their comp match ends:
:-)
GG
Thank you so much, i have been looking for this exact info a long time! Finally i maybe can use this to get my remote readings with a 4G simcard board
Glad you found it to be useful!
@@werewolfwuCorrect me if i'm wrong but didn't you miss a black cable in your picture of the drawing going from the 24v to sensor?
@@ChristianGrau92 Hello! Sorry for the late reply. There are only two wires connected to the sensor: red and orange. The best way to internalize the working mode of these sensors is to treat them as "smart" resistors, that adjust itself so that the current flowing through them "happens to" scale perfectly with whatever they are sensing. The common arrangement of "red for power black for ground plus some signals" does not apply to these sensors. Hope this helps!
Assuming you put the sensor in a tank and the height keeps changing when there is no water change (water addition or substraction). What could be problem if you are using a 24v battery
Hello GRM Central Kenya TV: If your reading keeps changing while the water level is not changing, then I would start by swapping out the sensor... :-) These sensors are enclosed micro computer systems, it's quite possible to be broken...
If my tank level sensor is a resistive sensor (240-30 ohms) its the same as 4-20mA sensor system?
Hello Diego: if your sensor is a resistive one, it is definitely NOT the same as 4-20mA sensor. You can still use a similar circuit as shown with minimal modification: simply form a resistive divider with your sensor (which is a resistor) and another resistor (say around 100ohms), and sense the divided voltage compared to the reference. This way you get the ratio between the resistors, and hence the resistance value. A little math is needed but not too hard.
is it the same way when using a magnesense pressure sensor?
should be!
Thank you so much for your video with a good explanation. I am also working on getting data from the industrial sensor but not getting the same data as the sensor display shows. Could you please help me with it without LCD? Thank you in advance.
Glad it helped!
Excellent video, valuable contribution thank you. Straight to the point and easy to understand. The one thing in my opinion - not a big fan of the werewolf character thing. In my opinion it'd be better if you didn't show your face as a werewolf, it's a bit jarring. Either no face or your real face. Your character and voice is enthusiastic enough that you don't need to show your face to your audience
But I spent hours doing python coding to put that face in..... OK....
May I ask what model of 5V to 24V converter are you using?
It's a generic module that I bought off Jeff Bezos' establishment. Similar things can be found on all sorts of online retailers, simply search for "5V to 24V converter". Required power level is low, a 50mA output capacity (or higher) is enough.
you can easy reach x00.000 subscribers with your videos,... nobady explain in this way,
Thanks! I started this channel just to have fun, wasn't even thinking of gaining subscribers etc. :-) e.g. for this video I just thought this is a cool way to have touch buttons for free! Everywhere else I searched, they try to make you pay for a touch kit of sorts...
Waw, cool !
Glad you found it useful!
please make more ....
Thank you for your encouragement! I'm scripting the next one...
Hey can you make a video on how to output 4 to 20ma from an arduino as a source or simulate
Hello Darragh: What you are asking for is essentially the output portion of an actual 4-20mA sensor. There are many ways to create a current source with digital control. e.g. a current DAC or a voltage DAC with a regulating feedback loop etc. If you don't need a lot of resolution, you may want to look at something like Max5550. If you do require a lot of resolution, search for "16 bit current DAC" and there are tons of options out there.
@Werewolf Wu yeah what I am trying see if I can do is use an arduino to drive a 4 to 20 ma positioner.
Thanks and great videos
My humble suggestion would be to use some kind of USB to I2C/SPI converter to control the current DAC on your dev bench. This makes the development easier. Once you have the control of the DAC verified, you can code that into an Arduino of sorts if your application requires it.
@@darraghross4310 glad it helped!
thanks for making this kind of videos, I am working with pressure sensors from 0 -15 Psi, and they return me from 4 -20 mA. This information will be very helpful to connect it to an Arduino MEGA 2560, Thank you for helping me and I will be following you to see what more content you make. Thank you.
Hello Paco: glad you found it useful!
Have you took a trail with pressure sensor with ardunio mega. Is it showing correct feedback? Please reply.
good stuff! 😃
Thanks!