author
3Instructables314,846Views356CommentsBristol, UKJoined August 29th, 2016
Build your own cutting-edge devices coming directly from the research lab. Ultrasonics, electromagnetism and more. Researcher at Bristol University interested in Ultrasound and in general any effect that waves can produce.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array3 days ago
    Ultrasonic Array

    Does this happen for all the channels? Sometimes when the mosfets are not soldered correctly they are not taking DC from the barrel and their output is just from the arduino (5V).

    TC4427a or MIC4127, be sure that you have orientated them correctly (paying attention to the dot). Otherwise check the legs with the multimeter if the vcc of the mosfet is connected to the vcc of the barrel. GND to GND, that you receive a 5V input signal and that the output is the same but with the voltage of the barrel.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 days ago
    Acoustic Levitator

    To increase the speed, just reduce the constant BUTTON_SENS

    If you do not put your head inside then it is fine. Acoustic pressure is very high but decays quickly and it is focused on the center.

    Depends on the voltage, at 7V I have had it working for a couple of days. At 10V it will get hot but you can add extra heatsinks.

    It is just in the viewer, in Cura and other programs the scale seems fine.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator6 days ago
    Acoustic Levitator

    I thought it was included, you can user regular copper wire as long as it is exposed (not with insulating coating)

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 days ago
    Acoustic Levitator

    D4 does not have to be connected with GND. connect the ground of the arduino to the gnd of the driver. Be sure that there are jumpers at the sides of the inputs of the drivers (they are to enable those inputs). Also double check the connections between A0..A3 to IN1..IN4.

    With honey is super hard since it is very sticky, with water doing like shown in the video is the easiest way. Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array7 days ago
    Ultrasonic Array

    What happens if you select all the transducers and switch them off (press s) and on (press w) you should hear a noise when they are switched on. Also if you can check the current consumption you should see it changing. Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator13 days ago
    Acoustic Levitator

    liquids take some practice. check the video at the end, you can try using alcohol which is easier. also use a particle to guide were to place. try to revert the wires of one of the bowls and see if that gives better results.

    Necesitas un convertidor regulable o una fuente de alimentación.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator14 days ago
    Acoustic Levitator

    Could you put a picture?

    After half a second or so the Arduino is booted up and sending the correct signals.

    Hola, puedes probar con un trocito de styrofoam (el corchopán blanco de embalar)? Cuántos voltios estás utilizando (puedes utilizar hasta 12V sin problemas), con 7-9V se puede levitar pequeñas gotas de agua, con 6V es más que suficiente para corchopán. échale un ojo si puedes al final del video, en él se muestra como utilizar una pequeña rejilla para ayudar a poner las partículas.

    You can ask them to get only transmitters. In all the cases that I have tested, transmitters and receivers are the same but I cannot confirm that for all the models.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator15 days ago
    Acoustic Levitator

    Most of the times the transducers have long legs. You can cut and peel one side of the jumper wire, wrap it around the leg and solder it directly. Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator17 days ago
    Acoustic Levitator

    Forgot to add the link, I have added it now. https://www.tinkercad.com/things/2yDkXuRhWhwBest.

    L298N is the right one.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array17 days ago
    Ultrasonic Array

    Copy and paste the content in the textbox. The obj has to have only the faces of the transducers as single polygons.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam21 days ago
    Acoustic Tractor Beam

    You can use thinner wire if you have it around although I would recommend that it can carry 1Amp. If it does not fit you can cut some of the threads from the wire. Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator22 days ago
    Acoustic Levitator

    Good work, white styrofoam works much better. Also, with some voltage you can levitate some liquids or insects (explained at the end of the video). Mounting the headers pointing upwards allows to glue the nano, connect wires and still see the pin labels. But as you said, sometimes the headers come already solder. Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator24 days ago
    Acoustic Levitator

    The cheap model (with 2 transducers) can only levitate styrofoam.

    I have not seen affordable transducers that output more than the current ones in terms of db per surface area.

    If you check the video and the paper of this Instructables you will see that oil and things with less than 2.5g/cm3 can be levitated with this setup but you will need all the transducers. You can replace the bottom with a reflective concave surface but could be tricky to align and calibrate.

    There are plenty of tutorials to get started with the Arduino.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 weeks ago
    Ultrasonic Array

    I usually change that part quite a lot. You can check gui/AddTransducerForm.java the function void exportTransducersMatlab() to see what is going on.If you uncomment the part in the beginning it will generate a nice function with one line per Transducer. Then you need the PistonModel.m which is commented at the end of that function.

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  • Asier Marzo commented on jollifactory's instructable JF Time Fountain4 weeks ago
    JF Time Fountain

    A piezo buzzer does the job quite well. In any case, this is a very good project.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator5 weeks ago
    Acoustic Levitator

    The scientific paper is here https://aip.scitation.org/doi/full/10.1063/1.49899...I recommend starting with the designs from the Instructables. In any case, good luck!!!

    They are supposed to reduce reflections but they basically do nothing so it is ok not using them.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam5 weeks ago
    Acoustic Tractor Beam

    IF you have good transducers, 19V could work better.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam6 weeks ago
    Acoustic Tractor Beam

    Have you put the jumper between D10 and D11?Are all the red lights (arduino and L298N) on?The signal at A0 arduino should be 5V 40kHz the signal at the OUT1 in the L298N should be 25V 40kHz.Best.

    They look fine, could you check with the scope (ground connected to ground) the signal on A0 of the arduino (it should be square 5vpp 40kHz) and the signal on OUT1 of the L298N (it should be square 25vpp 40kHz). Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator6 weeks ago
    Acoustic Levitator

    The Uno and the Nano have the same pinout and hardware so it should be fine. You can desolder the transducers from the Range Finder, I think they are the same model.

    24 is the resolution in your phase. You can divide a period of emission into 24 bits. More info about this in https://ieeexplore.ieee.org/document/8094247/ section II.C.1buttons_sens is how many cycles the button has to be pressed to change the phase. Reduce that number if you want the particle to move up/down faster.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam6 weeks ago
    Acoustic Tractor Beam

    Before desoldering there are a couple of things to try. You can get a big chunk of Styrofoam (white packaging stuff) and put it in the field, it should make a little bit of noise. Could you take a picture of the connections? Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam7 weeks ago
    Acoustic Tractor Beam

    Do you have an oscilloscope to connect a transducers and check if things are emitting? Are all the red lights on? Can you point the tractor beam into a water surface and check the deformation in water, it should look like two dimples.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 weeks ago
    Acoustic Levitator

    Ha, that it is awesome. Very good work.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam7 weeks ago
    Acoustic Tractor Beam

    Manorshi are the best value for money. I know the links goes to a different product, but when you contact the supplier you can ask them for the price of a specific model. I think minimum order is 500 but they may also do 75. The MCUSD16P40B12RO is just too pricey and does not work that well.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 weeks ago
    Acoustic Levitator

    Glad that you enjoy it. The particles are trapped at the nodes (stationary points of the standing waves) so both the expansions and rarefactions push the particle away. This is like a chladni plate but in 3D.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 weeks ago
    Acoustic Levitator

    They seem fine, my fear is that all the waterproof transducers that I have tested output much less amplitude than the "open-case" ones. So I imagine the will levitate styrofoam but not water or denser materials.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array7 weeks ago
    Ultrasonic Array

    Hi,Can you check that when everything is one (just by connecting the driver board) pin one is emitting?Doing it manually is fine, in fact phase correction is not implemented yet. Just check that the polarities and the assignment are right (as in the video).If you click play, the animation will be played because the frames are sent one by one, this is usually enough for most applications. You can also double-click the animation and all the frames will be uploaded (up to 32), then in the Devs tab you can send the exact amount of periods that you want to play each frame.For the moment I just released the attached video. If one day I get some time, I will improve it a little bit.Best,Asier.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    The flat 8x8 is for laser-cutting there is a ai file around. If you want you can pierce the transducers in some fine&rigid cardboard. Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    I have levitated a 100um particle but it gets really tricky, it is much easier if you agglomerate several together.. As the volume decreases the radiation force (gorkov, which is proportional to the volume) gets really small in comparison to t he streaming (proportional to the circumference?). So in air, there is a maximum (half-wavelength) and a minimum for the particle size(wavelength/100).

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    Which step? In the instructables some steps are optional and they are marked as such, they are just to check that everything is going ok.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    Nano will give 16 channels at most, in the github there is code for the nano.You need the MEGA to control 64 channels.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    I Ahmed, you are right if you modulate the wave at 200Hz you will feel a stronger tactile sensation. You can switch it on/off every 200 periods, attached code below.You can connect all the signals in phase for the tractor beam to just generate a focal point, or just use a single bowl from this instructables: https://www.instructables.com/id/Acoustic-Levitato...#include <avr/sleep.h>#include <avr/power.h>byte pattern = 0b10101010; //consecutive ports will have an opposite signalvoid setup(){ DDRC = 0b00011111; //set pins A0 to A4 as outputs PORTC = 0b00000000; //output low signal in all of them // initialize timer1 noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = 0; OCR1A = 199; // compare match register 16MHz / 200 = 80kH...

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    I Ahmed, you are right if you modulate the wave at 200Hz you will feel a stronger tactile sensation. You can switch it on/off every 200 periods, attached code below.You can connect all the signals in phase for the tractor beam to just generate a focal point, or just use a single bowl from this instructables: https://www.instructables.com/id/Acoustic-Levitato...#include <avr/sleep.h>#include <avr/power.h>byte pattern = 0b10101010; //consecutive ports will have an opposite signalvoid setup(){ DDRC = 0b00011111; //set pins A0 to A4 as outputs PORTC = 0b00000000; //output low signal in all of them // initialize timer1 noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = 0; OCR1A = 199; // compare match register 16MHz / 200 = 80kHz -> 40kHz square TCCR1B |= (1 << WGM12); // CTC mode TCCR1B |= (1 << CS10); // 1 prescaler, no prescaling TIMSK1 |= (1 << OCIE1A); // enable timer compare interrupt interrupts(); // enable all interrupts // disable ADC ADCSRA = 0; // turn off everything we can power_adc_disable (); power_spi_disable(); power_twi_disable(); power_timer0_disable(); power_usart0_disable(); while(true); //avoid entering into the loop}int nPeriods = 0;const int MAX_PERIODS = 200;byte mask = 0;ISR(TIMER1_COMPA_vect) // timer compare interrupt service routine{ PORTC = pattern & mask; //output portDV into ports 0 to 7 pattern = ~pattern; //invert all the bits if(nPeriods == MAX_PERIODS){ mask = ~mask; }else{ ++nPeriods; }}void loop(){}

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    For the pressure you need a calibrated microphone.The radiation force is easy to measure with the dropping test described in this: paper https://aip.scitation.org/doi/full/10.1063/1.49899...Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    - They are the signals to generate the different phases between the two generated signals (there is some info in this paper https://ieeexplore.ieee.org/document/8094247/.- If you want the particle to go faster/slower I recommend changing the value of BUTTON_SENS- the code is specifically tuned to work at 40kHz, below in the Instructables there is a simpler code (no phase change) that is much easier to use for different frequencies.- If you just gives volts to the transducers they will do nothing, they need to be excited with an oscillating signal (at 40khz).Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    It works from the website. Anyway, this one should work https://cdn.instructables.com/ORIG/F32/XCJP/IWMQUV4D/F32XCJPIWMQUV4D.ino

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    You can check this instructables for some simulations software: https://www.instructables.com/id/Ultrasonic-Array/

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    I recommend searching through pcbshopper, it is going to be cheaper and they usually support all the formats. I apologize since those files are not mine.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    I think there is a link to the connectors to be used in the zip file.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    I do not think those close transducers will work, everytime I have measured them they output very little. You only need 24.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    Great work and thanks for the suggestions.For BigLev you should use exactly the same setup as for TinyLev.Best,Asier.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    I would put them in sync with the 5. Best.

    Paste the obj text in the box and click import from OBJ. There should be only one polygon per transducer.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    Hi,- 3 ways because the pitch is 2.53mm, the separation between the legs of the transducers is 5mm, so the middle hole is not used. It is the cheapest and most reliable way I have found to connect transducers to wires in a reusable manner. If you want you can just solder directly the wires.- You can see how they connect in Figure 10 https://ieeexplore.ieee.org/document/8094247/- The PCB has 2 layer, I do not know about the dimensions but it should appear in the manufacturer.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    You can populate them for more power but you will lose a little bit the ability to move the particles up/down.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    There are some links to 40kHz transducers. 4kHz will not work and also they are really loud. Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    I am powering the logic part of the L298N which works at 5V. It is not the most optimum way of doing it but it was the safest for the regulator. In any case, I have put more than 19V in the regulator of the L298N without any problem, if you check the wiring for the single-axis levitator it is much simpler: https://www.instructables.com/id/Acoustic-Levitator/

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    the cover is great!!!

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    It does not matter at all, as long as the metal wires make good contact with the legs..

    Really good work.

    In a regulated power supply. In any case, this step is just for testing that everything is going ok.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 months ago
    Acoustic Tractor Beam

    You need to export only the faces of the transducers as an obj, copy this obj and then use the import from obj feature.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 months ago
    Ultrasonic Array

    If you check the my other instructables, there are simplified versions that use only an arduino and an L298N as a driver. The tractor beam is considered to be single-sided. If you want a pure flat surface then you need individual phase control, you can also check the tractor beam for the 3D printed tubes device.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    When using styrofoam particles of around 2mm size it should be enough with even 6V and it should be very easy, especially if you use a piece of fabric or metallic grid.

    You need to upload the code for that step in the Arduino. Then on the Serial Plotter be sure that the Correct port and speed have been selected. You can also use a regular oscilloscope if you have one around.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    Really good work.

    If they are from different bowls it does not matter. Give it a try anyway, it may have enough strength for your applications.If they are from the same bowl and they are in reversed polarity it will be decrease the levitation strenght. You can cut the wires behind and in front of that transducer and put new wires in zig-zag.

    Yeah, there is an alternative method using the Arduino nano. It is described in step 4

    You can change the frequency of the transducers either when you add them or when they are selected in the Fr: textboxYou can also add manually the speed of sound and density for using different materials. However, when you do levitation in air the particle material does not matter at all, everything is solid compared to air.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam3 months ago
    Acoustic Tractor Beam

    Sure, if you check this instructables https://www.instructables.com/id/Ultrasonic-Array/, there is a video and links to the software.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    Since the arduino can only run one thread it is hard to combine logic with accurate emissions of phases. I totally recommend getting a another nano that process the joystick and activates the D2,D3,D4 pins.Best.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    The Uno is similar to the Nano so it should be fine.Why would you like more transducers? For more power there is a step with Big Lev. If you want more control on the particle with individual channels then it gets a little bit more tricky https://www.instructables.com/id/Ultrasonic-Array/

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    Check Step 2340 kHz transducers only operate at 40kHz. You need to buy 25khz transducers (from Manorshi for instance). To operate at 25kHZ use OCR1A = 320;

    40 kHz transducers only operate at 40kHz. You need to buy 25khz transducers (from Manorshi for instance). To operate at 25kHZ use OCR1A = 320;For pressure changes and more complicated stuff you can check my other instructables in Ultrasonic phased array.You can move the particles faster, if you check the code you can easily reduce one of the constants.

    It looks great, you can also try with spheres of styrofoam painted with different colours.

    Have you uploaded the code in to the Arduino?Have you selected the correct port for the Serial plotter?Best.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array3 months ago
    Ultrasonic Array

    There was a mistake in the part number:I have corrected it to 506-7014

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator3 months ago
    Acoustic Levitator

    Hi kate,How big are the particles that you are trying to levitate?Can you try putting them in the middle of the levitator?How much voltage are you providing? Are all the lights on?Best,Asier.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator4 months ago
    Acoustic Levitator

    Are you sure about that? that would imply that the Piezo crystal is always placed with the same orientation. In any case, I will try it. If it works, it is a very nice and simple method. Thanks for the info.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 months ago
    Ultrasonic Array

    Yes, the mosfets are powered directly by up to 12V (or up to 15V) you can replace the TC4427a by the MIC4127 for being able to put more voltage.If you want to experiment with the tactile sensations I would recommend starting with bowl from the https://www.instructables.com/id/Acoustic-Tractor-... and the driver from https://www.instructables.com/id/Acoustic-Levitato... just by modulating the 40kHz on/off at 200Hz you will feel the focal point. The point is fixed at a spot but it will give you an idea of how it feels, which in my opinion is a little bit disappointing.In any case, I am working on releasing a 16x16 integrated array that may be more suited for those tasks.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 months ago
    Ultrasonic Array

    I have just added the pin number at the end of Step 3. But luckily the assignment with the nano removes the need to check that.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator4 months ago
    Acoustic Levitator

    Great, I have added a link to your code if you do not mind. Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam4 months ago
    Acoustic Tractor Beam

    Glad that you like it. I will try to publish it soon, I just want to be sure that it sounds as good as possible.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 months ago
    Ultrasonic Array

    Corrected. Thanks!!!

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 months ago
    Ultrasonic Array

    Have you added the lines of code in HardwareSerial.h, the instructions are at the end of this https://github.com/asiermarzo/Ultraino/tree/master/Arduino%20MEGA%2064%20driver%20board%20code and in the header of the files. Also be sure, to have only one .ino file in the directory. Best.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam4 months ago
    Acoustic Tractor Beam

    Normal sound is ok with it but if it is very loud it will make the bead wobble. Ultrasound will not go through wood, it only goes through metallic grids and most fabrics.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator4 months ago
    Acoustic Levitator

    Something must be wrong. You are using the nano or the scope? Can you reverse the transducer connection and see if the signal looks the same.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array4 months ago
    Ultrasonic Array

    Have you selected the MEGA as the target device?I do not have the uncompiled schematics for this one but a brief schematic for the channel can be found in the paper http://ieeexplore.ieee.org/document/8094247/Best

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam4 months ago
    Acoustic Tractor Beam

    Hi,this levitator uses a twin-trap ( https://www.nature.com/articles/ncomms9661 Figure 3). vortices can only trap stably very small objects because it makes them spin like crazy. Single-sided levitator are cool but not very powerful. If you need to levitate dense objects I recommend the standing wave lev https://www.instructables.com/id/Acoustic-Levitator/ . I also added the instructions for smal 8x8 phased-array that can generate any beam but it is a little bit tricky to make https://www.instructables.com/id/Ultrasonic-Array/ Best

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator4 months ago
    Acoustic Levitator

    generate 40kHz signals that will be later amplified by the L297N driver and then fed into the transducers.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator4 months ago
    Acoustic Levitator

    good work, if you need more info about levitating other materials you can check this open paper https://aip.scitation.org/doi/full/10.1063/1.4989995

    They are just buttons to move the particle up/down, you can ignore them if you do not need to move the particle

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