I'm making one of these for my Curse of Strahd D&D game, so I can literally make players hear voices in their heads.

@AlexanderTheMiddle

3 жыл бұрын

Wow! Did you succeed? Can I please see the result?

@chupacabraattack

3 жыл бұрын

That’s an awesome idea

@melissamosby9237

2 жыл бұрын

It’s harassment

@AndroidFerret

2 жыл бұрын

Did it work?

@jtjames79

2 жыл бұрын

@@AndroidFerret yes and no. Yes it works, but the coof canceled the game.

They really need to implement this on phones, this would be a practical use, so only the user can hear the audio and not disturbing those around them

@manuelmozzali-ie2xe

3 ай бұрын

The quality will be worst than mono speakers from Chinese FM radio you get for free inside packets of chips as surprise. I don't want that in my phone in 2024, it has Bluetooth xD get earphones

@PinkeySuavo

Ай бұрын

earphones have entered the chat

@Adam0Null

Ай бұрын

But earphones can cause ear infections, and nobody wants that exceptionally someone who uses them 24/7 !!

@PinkeySuavo

Ай бұрын

@@Adam0Null everything can cause ear infections,just clean them. I used them for many months and years and I didnt have any infection. My first infection was after diving few meters deep in the water.

@Dr.Tinkerpaw

28 күн бұрын

There is a vast swath of population that has absolutely no consideration or awareness for the people around them that don't or won't use headphones.

now convince your family there is a ghost in the house

@thewhitefalcon8539

3 жыл бұрын

I did that by putting a rpi and a speaker underneath a family member's bed

As a Electronics Engineer I have built many circuits in the past but this is the first time I have a built a ultrasonic Audio laser. I had a bit of trouble to get it to work using the Mic4427 driver chip so I used the L293DNE driver chip instead which has a much higher working voltage of 36v compared to 18v of the MIC4427 and the circuit works fine now I also replaced the preamplifier chip with the TL082 which is capable of operating of a split rail voltage supply. In the future I might use the raspberry pi pico which run at 100Mhz to upgrade the power and sound quality of the Ultrasonic audio laser further.

@MeanGeneHacks

2 жыл бұрын

Nice to hear you made some upgrades and its working!

@CaptainKandi

2 жыл бұрын

Hi John, I'm making one of these for a university project and I decided to take your advice here and use a raspberry pi pico microcontroller! I'm very new to electronics and coding so I'm having a bit of a problem. With the .cpp file you get from github do I need to change the #include directories from 'arduino' and 'stm35 etc' to a header for the pi pico instead? Any help would be appreciated greatly! Thanks, Luke

@kawrx2002

2 жыл бұрын

@@CaptainKandi You might have resolved the issue by now or moved on if it’s a project. But you would need to use pico-specific DMA and ADC libraries, as I doubt the functions / arguments are portable.

@ted_van_loon

Жыл бұрын

@@nander1988 hi, ik heb zelf geen raspberry pi zero momenteel, mogelijk in de toekomst wel maar momenteel niet. de suggestie die ik daar maakte was voornamelijk om een goedkope en makkelijk reproduceerbare versie hiervoor te maken met makkelijk verkrijgbare onderdelen. maar heb er zelf geen raspberry pi zero. echter had ik voor mijn eigen versie gekozen voor dedicated hardware. op die manier hoef ik niet allemaal dingen te programeren en dat scheelt werk. ik gebruik een simpele oscillator 555 met een versterker en wat andere dingen. echter terwijl het geluid wel duidelijker hoorbaar was in een rechte lijn kon je het daarbuiten ook nog horen in deze versie dus die was niet goed genoeg, anderen hebben het ook met vergelijkbare chips gemaakt dus er zijn tekeningen van vergelijkbaare systemen. echter voor testen omdat die versie niet goed genoeg was had ik besloten on direct de audio kaart van een computer te gebruiken voor het audio signaal en dat je dan weer alleen een versterker nodig hebt. is niet de beste oplossing maar wou het testen zonder te programeren omdat ik niet zeker weet welke vorm van modulatie er bedoeld wordt en wil niet een hoop code schrijven voor de verkeerde modulatie. deze manier werkt trouwens ook direct op een raspberry pi zero zonder programeren zolang je linux er op hebt staan. om dit te doen heb ik gewoon audacity gebruikt, dt audiobewerkingsprogramma heeft namelijk een functie ingebouw om audio te moduleren. zet de bitrate omhoog, moduleer het en je kan de bitrate dan weer iets omlaag zetten om ruimte te besparen of omhoog houden. er zijn bepaalde bitrates waarop het beter werkt, helaas heeft audacty geen standaard bitrate die een directe meervoudiging van 40khz is of 40khz dus kun je bereken welke je gebruikt of probeer een aantal settings tot je er een vindt die niet te veel distortie heeft en gebruik die. om het te convertion in audacity heb je audiotrack(als een mono track of omzetten naar mono), ga dan naar tool nyquist prompt en gebruik het volgende commando: ;version 4 (if (and (soundp *track*)(= *sound-srate* 384000)) (osc-pulse 40000 *track*) "Error.\ Input must be a mono track\ with 3,840,000 Hz sample rate.") zorg dat de track met track->resample omgezet is naar belke bitrate je gebruikt. deze pat 3840000hz maar er zijn betere en er zijn ook manieren om custom sample rates te gebruiken als het goed is, met een custom sample rate kun je ruimte besparen en veel betere qualiteit hebben. voor deze heb ik echter gewoon een standaar samplerate gebruikt je hoort dat wel maar voor testen kan het goed/handig zijn. met een pi zero zou t wel effectiever zijn om gewoon de audio af te spelen direct of de modulatie zonder software maar ben er nog niet echt verder in gegaan omdat ik onderdelen voor een ander project binnen kreeg en daar mee verder ging.

@mbproducoes

Жыл бұрын

Hello John, I had some success building the original project from @meangenehacks, but I would like to see how your project improves compared with the original. Would mind share your schematics? Thanks a lot.

Thanks for this. I’ve been checking in on directional sound every few years and this looks like something I’ll try to build.

You can also generate a PWM-modulated signal by feeding the audio and a 40-kHz sawtooth to a comparator like the LM358

If you played a mosquito buzzing sound through it, you could make people flail at your command.

I have some crackheads across the street that keep me up more times than not. I am absolutely going to use this. Didn't coca cola pay to have this developed because they wanted people to hear a glass of coke being poured when they walked past a vending machine

@MisterKaen

3 жыл бұрын

@@Mo-uk7pv i never did but now i just decided to file an abatement. I had one of the crack dealers show me his gun just 2 days ago. Im over it. Abatement clear that nuisance out.

Really great video. Thanks for sharing. I'm just trying to increase my knowledge base in electronics. I'd like to be able to build various electronic devices to use around the house and garage. I can't get over how inexpensive electronics parts are. The electricity part of it was easier for me because, believe it or not, there's alot of parallels to pipe-fitting and hydronics, which was my trade. I'm subbing for sure bud. Thanks again.

That's freaking cool. I bet i could prank people so funny with that. Great work!

Gene, you should try to make a standing wave levitation device using this. You’ll get many views 😂

thank you Gene. This is so cool

Thats awesome man.. and you made it so cheap..! I am going to build one now 😁

Cool video, one question, what do you recommend for high disable or amps?

Thanks so much for this! Is this how they talk in our heads?? Must be more to it than this..

Cool project! Which STM32ADC library did you use (I am new to STM/Arduino - Sorry)

I thought this could be done by people without previous electric/mechanics knowledge and that would have a hands on step by step after the explanation. Still congratulations, I'll keep searching for a "DIY audio laser for dummies".

@securityboy122

5 ай бұрын

Skill issue

I noticed that imminating sound effect with a ultrasonic measure I bought at thrift, made me think that there is potential that ultrasonic mouse deterrents might be a real thing just majority of the time probably implemented wrong as I've never heard one that sounds anything compared to it, and would imagine it would freak out any small critter

Thanks for the fun project. It was quite painful to find the proper stm32adc lib, but eventually it worked. Maybe I messed something up in the soldering, but the sound is quiet, directionality is somewhat present but it's more of a bad speaker with noisy audio than an audio laser. At 18volts tc4427 overheats really quickly, so I had to wind down it a bit to have at least several minutes of working time. Probably I'll look for different components and try building v2 when I have some spare time.

@BeatMyth

2 жыл бұрын

I had exactly the same problems. First to program the STM32 and once I managed to do that, it works but as you wrote "more of a bad speaker with noisy audio than an audio laser. At 18volts tc4427 overheats really quickly". I have managed to burn a few of tc4427. The weird thing is that he managed to make it work quite ok. Did you figured out any improvements or mistakes we made?

@caseyfaller8394

2 жыл бұрын

Where did you find the stm32adc lib? Thats what im stuck on

@LuciusLu

2 жыл бұрын

I am also looking for a stm32adc library that works for the stm32duino platform on the Arduino IDE. I found one by Roger from Australia, but something is missing. I am using blue pill stm32f103c. I'm stuck.

@supermariosupermayhem

Жыл бұрын

How did you find STM32ADC.h ? Tried with one on arduino IDE but "compilation failed" with no additional reason.

wow, this is really cool!!!!!! could u please give us a detialed tutorial on how to implement this? I'm just really not good at these.

Dude...this is very cool.... I got this idea and tried implementing it. Didn't get very far. I thought it could be made like a personal "wireless" earphones device. Like you could be sitting in class pretending to listen to your prof, but actually be listening to songs or whatever. Great job anyway.

@guru332

4 жыл бұрын

Since the audio is highly directionality, you could have two way communications between two people at opposite ends of a class with nobody else would hear or know. Or you could use it to just troll the teacher and make them think they are hearing voices 😀

@MeanGeneHacks

4 жыл бұрын

I was at 33C3 in Hamburg, Germany, where I first saw this type of device in use. As people went up an escalator to the 2nd level, they would hear appear music out of nowhere. The music was being beamed to the people on the escalator from about 40 ft away.

@wizardOfRobots

4 жыл бұрын

@@guru332 Way to troll them

thanks

Any thoughts using a pulse train method as a third method? Like a digital method such as performed with LPCM wireless? Really awesome project and video. Thanks for sharing!

I have a question. Say you put your hand in front of the speaker. Will it sound like the sound is coming from your hand? I saw a video of a professor aiming the speaker at a wall and the students could hear the sound as it bounced off the walls. Just wondering how the speaker works.

Awesome. I'm going to make a laser+sound cat toy with this

@MeanGeneHacks

3 жыл бұрын

Have fun!

Bro you are a king. Keep on doing some awesome videos !!! Jeremy IRCAM Research Institute Paris

I need one. I got a neighbor who is obsessed with leaf collection to the point he runs his leaf collection trailer on his rider mower (wannabe parking lot sweeper) at full throttle with no muffler all day. I’m certain that he will hate a recording of it directed at his bedroom at 3AM. Gimme.

Please do a demo for implementation option 2! 😊

This channel is one of KZread‘s hidden gems. Your work is incredible. Although I hate you because you are good looking but also very smart in multiple areas.

Interesting. I imagine using a pure class D amplifier would eliminate any quantisation errors and improve the quality greatly. All you need is a sawtooth generator and a comparator to drive your output stage.

Using a 555 timer with the control voltage pin, pin 5, for the modulation, an LDO (or something) and amp, will do this in 3 main components.

Really great project. Some comments: this MCU is plenty fast for high quality sounds, it just needs to be programmed right. Arduino is crap for performance. STM32 uC have tons of timer modes, it could be used much more efficiently. Also the ADC, your code uses DMA but for one sample... so the interrupt rate is high. Would be much better to use DMA ADC to fetch a few KB samples at a time, then compute the expected response PWM required in a buffer and use another timer to schedule appropriate output frequency changes at the correct rate. All I am saying is that the code is way sub-optimal and could show much more improvement before anything hardware needs tweaking.

@erkamboyacioglu3515

Жыл бұрын

did u manage to change the code to fit your needs?

Wait, will this work to shut down the loud TV or Radio music speaker from my neighbors?

How would you modify this design to turn it into a high frequency sicnal (20-30 khz) to be used as an anti-barking device for dogs and what distance range does it have? Thanks.

There are other sound focusing videos using noise cancelation by generating signals that are inaudible to the human ear. The 2 signals are not the the same and when the signals reach the focal point only the difference in the signals are amplified. The focal point could have unthinkable amplitude of power and no one would even be aware of it. Your design could be the delivery device.

great video!! I would love to build it by myself. I already startet. I wonder which kind adapter do I need for the STM32ADC? I am new to this. Would be very thankfull about an answer:)

Fantastic work 👌🏼👌🏼👌🏼

Hi great introduction to electronics for everyone. Are there ultrasonic speakers on mobile phones? Do you know of any miniature ultrasound speakers for mobile phones?.

Would it be possible to use this idea to create, instead of a beam of sound, a singular point of sound? That way something like a phone could use face tracking to project sound right to your ears? I’m thinking about maybe trying something like this for my senior engineering project

@ceticx

4 ай бұрын

I have literally no experience in this, but I'd imagine you could get something like that working just with a directional beam pointed at the ears as long as its quiet enough. If its too loud the demodulated audio would bounce off your head and maybe allow other people to hear it, but quiet enough and maybe it'd only be audible in a small area around your ears, although it's not something I'd trust for privacy like headphones with this approach. Something work testing out lmk if you try anything

Amazing, I wonder if it's possible to recreate this with PSOC

An amazing peoject. I don't have any background in electronics. Could you post a video with a step by step puting toguether? Would really appreciate it

I have no experience making this stuff, anyway to make a how to tutorial?

it is similar to LRAD Well done ✌✨✨✨

Thanks for sharing! How loud is the bass coming from these speakers?

I'm currently working on this project but using an ESP32. I'm hung up on the complementary output. Can I not just output a second PWM to another pin? But for this pin, I would swap the last two arguments in the map() function for duty cycle which would invert the PWM output. First pin duty cycle: map(soundInput, 0, 4095, 0, overflow);. Second pin duty cycle: map(soundInput, 0, 4095, overflow, 0);. Or something like that.

I want one of these so bad

How far will this setup project the audible sound,,! or the range of it?

very talented nice work

These work excellent if you have a really messed up neighbor.

Thanks

What is the spacing mounting the transducers

How would you deflect this if you weren't aware of where it was coming from? or more sophisticated types that can go through walls?

Hello. I was thinking on replicating this project with some modifications. What are your thoughts on the use of a Raspberry pico w instead of a STM32F103C8T6? Would that be an improvement or a downgrade? also what opamp would you recomend since you say there are better options? I have some IRLZ34N lying arround if those are any good. I would be thankfull for any help you can give since im still starting to learn about this kind of eletronics.

should I need to recalculate the cost of Volt if I put more speakers on it ?

Hi there thanks for this innovative idea 🥰 I have no way to use arduino 1.8 now can you please update th code or comment usage of timer1 and 3 I mean regarding configuration are you using channel 4 on TIM1 output compare(obsolete as per newer version) or just counting. thank you in advance.

With the carrier only 40KHz, what is the highest frequency are you sending?

Nifty AF !

Hey do you have any clearer images of the pcb setup?

do you make them for people privately ?

Hi, how did you build the array? What are they plugged into and how are they welded? thank you

Thanks for sharing. Is there a decible limit on the audible sound that the ultrasonic sound would be able to limit?

@xxdogxx3637

Жыл бұрын

No

Can you create a circuit that converts the ultrasound into regular audio? I have five to seven directional speakers aimed at my house that are used as part of an online broadcast in extortion racket. In addition they use surveillance equipment illegally installed in my house to sim the directional speakers. An antenna system with an ultrasound and frequency analyzer costs in the $100,000’ so a simple detector system with audio speaker out would be helpful to record.

@silverlightsabr

2 ай бұрын

similar situation - have you found a solution to get rid of them?

Dear Mean Gene,We are writing to you regarding the ultrasonic directional sound speaker design you developed. We are two students studying electrical and electronic engineering in Turkey. We reviewed your design and decided to do this project for our graduation project. We have performed the STM-32 boot process and set up the circuit as shown below. However, we are struggling to understand how to power the TC-4427 integrated circuit and have not been able to obtain any sound output from the circuit. Could you please provide us with detailed information on this matter? Additionally, could you share more information with us about the design of the circuit on the breadboard?

Can you show how to make a circuit for a transducer transmitter and a transducer receiver as two different pices

Super interesting, but how do yo have all those spare parts laying around in your house? Did you dismantle the millenium falcon or something? Sounds like something Rey would salvage

My neighbors are imitating this with multiple sensor's around the Streets, you Walk into the path it activates causing headaches and sound bubbles around the ear like described off the technology that released technology that sends music to ones ears by one output. How do you block Immitating ones like this.

Now what would you charge to make an ultrasonic dog deterrent that was bark activated following this same design?

Hey, could you share your research citations? I'd love to learn more about to project and where your formula comes from!

@MeanGeneHacks

3 жыл бұрын

Citations are in the video.

I just simulated it with the transducers at multiple different distances from each other and noticed that while it does kind of work with almost all distances it does seem to work much better and more directional when all speakers are at exactly half a wavelength from each other. since the transducers are to big for this(wavelength below 1cm) some other distances have to be used. did you use a calculation or simulation to determine your distances and if so what are the distances between them in 2 axis. or did you just place them however you felt like, if so adjusting the distance might increase the distance and directivity.

@kawrx2002

2 жыл бұрын

I think placing them as close as possible together is most effective. The transducers lose 6 dB of pressure at 30 degrees off center; and maximizing the pressure over distance takes advantage of all of the transducers feeding into a combined wave. For a perfect transmission you would need to individually control the timing of each transducer phase to “aim” at a specified distance.

@strandedoncat

4 ай бұрын

@ted_van_loon What about using speakers w smaller diameters? The transducers in the video are 16 mm but also come in 12 and 10 mm.

@ted_van_loon

4 ай бұрын

@@strandedoncat I actually used 16mm ones in my build since they are cheaper, this comment however was based on simulating it and was done before building, so that means essentially not measuring the diameter but instead using the exact center of the speaker as the point from which the soundwaves come, technically seen based on the transmitter it's optimal behaviour should be like that, which is why I used it in the simulation. however luckliy for us the imperfect behaviour of the transmitters automatically increases directivity.

what happens when you put this directly to a concrete wall? Can you hear it behind it or it reflects back?

Do you sell these? I would love to purchase one because I do not have the know-how to make one myself.

hi, we are a group of 3 students using your video as a reference for a school project , is there any way for us to reach you other than the yt comments? otherwise great video!

@MeanGeneHacks

3 жыл бұрын

Yes, of course

Is it possible to have infrasound encoded in the ultrasound beam?

The apparent bass response is miserable, but I suspect this may be caused by the microphone used to listen to it. Is bass response better to the human ear? What can be done to improve it? I have heard professionally made "Sound Lasers" that have impeccable bass but I suspect these are implemented as the dual beam interference type.

@kawrx2002

2 жыл бұрын

I’m wondering that also. I built this project (perf board prototype and PCB), but used a TLC 272 for the pre amp. Just with experimentation, bass sounded a little better by using a higher value cap for C3. I know other parametric speakers use different modulation, and possibly different filtering. I can also say the bass response is better on my PCB board, where I have them placed closer together (and many more) than on the perf board.

Do you know how i could make it louder like in the 120-130 db range

Hi, could this be used as a ultra high frecuency gun? Could it play 20Khz sound to use as ultrasonic gun? I have a sleeping problem with a nearby nightclub and would like to use this for the drunks that come to pee and binchdrink to my door. Thank you

O! And! Would a pure sine wave have a narrow beam?

can I use some of those cheap 80w piezo horn tweeters for this project, or does it have to be a transducer? And is it possible to use regular amplifiers for the project, or will I have to build my own?

@MeanGeneHacks

3 жыл бұрын

The speaker must be capable of outputting a 40khz signal if you use my code as-is. Therefore, you will need a ultrasonic transducer.

@darkhypersthene7108

3 жыл бұрын

@@MeanGeneHacks I see. tyvm for the info

Hi, how does the modulation of the audio signal work. so what kind of input signal and what kind of output signal? do you know of or have any visualizations or a description of what exactly it does? does it just use the 40khz as a carrier frequency and the sound as a signal/data frequency? or is it more like PWM or something? and does it only support digital audio or is it also analog(due to some kind of PWM like mechanism)? -edit- Based on the code I guess it used 40khz as a carrier signal and then modulates that with the audio signal as a PWM(which would mean high volume difference accuracy at low frequency, low volume difference accuracy close to 20khz). if this is actually the case something like a 555 Timer might work well in this case and be a lot cheaper and smaller.

@yuchenchen673

Жыл бұрын

This video built one with NE555 and it actually worked kzread.info/dash/bejne/k3aYuMiOnraToLA.html

Attempting to make one of these now! could you explain how the transmitters are connected?

@matthewboga

Жыл бұрын

Im trying to figure this out right now as well, did you ever find out how they are connected?

Thank you so Much. I Really love your idea and I ordered the list component to make it :) But could you please give more photo and explaination about the wiring of the modules together ? I'm not enough skilled in electronics to build all follow the Schematic.png and wire everything by myself. Thank you again. Jeremy

@MeanGeneHacks

3 жыл бұрын

I am working on a follow up video with some improvements and more details.

@jeremyuzan1169

3 жыл бұрын

@@MeanGeneHacks I would really love to build it myself 🧡🧡🧡🧡🧡😎

@christopherbrown3614

3 жыл бұрын

Yes! I ordered the parts as well and this will be very helpful!

@JDS1012

3 жыл бұрын

@@MeanGeneHacks Is this a form of voice to skull technology?

@stephenrozen4917

2 жыл бұрын

@@MeanGeneHacks do you have any plans to release that video?

How will it work underwater? will underwater lives communicate like this?

Can we use Bluetooth speakers as ultrasonic audio laser?

Hi, my son would like to make this for a school project, but some of the links no longer have the item. I have no idea on this stuff could you point me in the right direction to find al these parts, please.

what do you think would be the best way to record the sound on the receiver end as in so catch the sound and then record it.

@MeanGeneHacks

2 жыл бұрын

Not sure, its a bit tricky because the audio is quite directional and only can be heard when it hits something. And even after it hits something, its not very loud, so the ideal way would probably be to aim directly at the microphone or aim at a flat surface very close to the microphone.

I want to try using this as a human echolocation tool.

Thinking about this idea so I can play music at a decent volume without annoying my neighbours, needs to be CD quality audio

I am trying to understand the circuit. the MIC4427/TC4427 is connected to PWM and complementary PWM at the 2 inputs. My understanding is that the output would be a 18V to 0V version of the PWM and complementary PWM, respectively, because the power driver is non-inverting. Now, the PWM is connected to the + and the complementary PWM is connected to the - of the transducer. Is that the desired effect? This is where I don't quite grasp what is happening -- if the + end is 18V, the - end is 0V, but when the + end is 0V so that the target duty cycle is achieved within each 40kHz pulse, the - end is 18V. Does this mean that the transducer will also play a inverted version of the PWM audio?

@MeanGeneHacks

3 жыл бұрын

Sorry for the late response. The complementary outputs are used to get a larger range for the output from the H-Bridge. So instead of the transducers being fed 0-18 volts, they are fed -18v to 18v, effectively doubling the voltage driving the transducers.

Hey, just out of curiosity, whats the range on that thing?

I need one to play the fnaf golden freddy sound in my classmate's ear so they freak out and everyone thinks they're scitzophrenic.

How do we get in conntact with to have one made. Or the that hard to make

What's the maximum distance you can hear the sound

I was curious, when you're pointing the device at yourself, do you perceive the sound coming from the device itself or from elsewhere?

@MeanGeneHacks

2 жыл бұрын

It reflects very much like a laser beam. If I point it directly at myself, it sounds like its coming from the device. If I bounce it off an object (ie. wall), it sounds like its coming from the wall.

@azinfidel6461

2 жыл бұрын

@@MeanGeneHacks Ty

is it possible to use only 1 ultrasonic transmitter and would it be possible to make it smaller so you can easy carry it in the pocket?

@MeanGeneHacks

3 жыл бұрын

In theory, yes. I'm not sure what type of sound output you can expect from a single transducer. More than likely, at the current voltage that the driver in my circuit is set at, you may not hear much with a single transducer. You can explore replacing the driver with one that can handle higher voltages and see if you can get it working with a single transducer.

What will i do, to decrease or increase the width of the directed sound.

@MeanGeneHacks

3 жыл бұрын

The beam width is mostly dictated by the parameters of the ultrasonic transducer you are using. Most 40kHz transducers will have similar beam widths. If you want a wider beam, you can go to 25kHz transducer, but you'll have to change the code so that the new modulated base signal matches.

Hi pls can you advise me on some information I seem to be hearing a very loud high pitched sound in my house I feel it might be some kind of sonic sound wave do you have any idea how I can block this sound or find where it is coming from it has recently started

@user-ky9nz3sk2x

3 ай бұрын

Wear a mask, put baby powder in the air,, with a night vision camera on.. should see where it's coming from... An surprised at the same time..

Where do i find the stm32adc lib. You list the code in the github but not the lib.

Would I be able to use an Arduino nano (ATmega168) micro controller for this project? I have some of those lying around. This tutorial is awesome. I am wanting to make this as an alarm clock for my dorm.

@MeanGeneHacks

3 жыл бұрын

Unfortunately, thats very unlikely. The Nano is an 8-bit MCU that runs at 16Mhz. For comparison, the MCU I used in the video is 32-bit running at 72Mhz. I don't think you would be able to process the incoming audio fast enough to output a modulated 40Khz wave on an Arudino Nano using the method & code from the video.

Thanks. Now im gonna make a 50khz version and blast it at my neighbor's dog for barking non stop at 3am

@mycosys

2 ай бұрын

You seem like a terrible person. Why torture something that is already clearly tortured. Why not show some humanity

@mrchickenfugget2035

Ай бұрын

Your such a loser nothing more to say

I think some cartel mfers on a job site used one of these on me to make it seem like bullets were wizzing passed me on my porch. How far away can you hear these?