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3Instructables298,335Views316CommentsBristol, 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 Acoustic Levitator2 days 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 Array3 days 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 Array8 days 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 Levitator12 days 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 Beam12 days 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 Array15 days 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 Beam18 days 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 Array19 days 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 Levitator19 days 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.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam19 days ago
    Acoustic Tractor Beam

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

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

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

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array22 days 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.

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array23 days ago
    Ultrasonic Array

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

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam24 days 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.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator25 days 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 Beam4 weeks 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 Array4 weeks 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 Beam4 weeks 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.

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

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

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam4 weeks 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 Levitator4 weeks ago
    Acoustic Levitator

    the cover is great!!!

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator5 weeks 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.

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

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array5 weeks 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.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator5 weeks 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 Levitator5 weeks 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 Beam6 weeks 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.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 weeks 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.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator7 weeks 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/

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 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 Array2 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 Levitator2 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 Levitator2 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 Array2 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 Array2 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 Levitator2 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 Beam2 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.

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

    Corrected. Thanks!!!

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  • Asier Marzo commented on Asier Marzo's instructable Ultrasonic Array2 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 Beam2 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 Levitator2 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 Array2 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 Beam2 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 Levitator2 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 Levitator2 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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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator2 months ago
    Acoustic Levitator

    https://www.instructables.com/id/Ultrasonic-Array/ there will be a video on how to use the software and links to github. In github there is the source code and some simulation files, there is one for TinyLev.

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

    Hi,High-pitches noises may be due to some particles or glue inside the transducers.Putting water requires some practice with the syringe, kindly check the video at the end.D2,D3,D4 are left unconnected and pulled to ground to move the particle up, down or reset respectively.Best.

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

    They are button to control the movement of the levitated particles.

    View Instructable »
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    Likewise, keep on with the good work : ) and send my regards to Jess McIntosh.

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  • Asier Marzo commented on Jakub_Nagy's instructable Acoustic Levitator Case3 months ago
    Acoustic Levitator Case

    It look great. Thanks for sharing.

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

    It is an option step, just to check that everything is emitting what it should. Indeed, there are 2 transducers connected to each probe of the scope. Transducers can be used to emit but also to read signals.

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

    I think they have the same link for several of them, when you make the inquiry just tell that you want this model MSO-A1640H10 (only transmitter) and it will be fine.

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

    what you are doing seems fine. If you are in doubt poke the transducer with a thin wire and you will see a spike in the same way as you see in the oscilloscope method.

    filament should be fine but try first with 2mm (aprox) diameter styrofoam, they are the easiest to levitate so if they do not levitate something is wrong. The driver board should be producing a square wave with a peak to peak voltage that is double of what you put in. You cannot measure it with a multimeter, you need an oscilloscope.

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

    There is a link to a kit with all the stuff, you can also use something like 3dhub

    any gauge is fine but I recommend the specified gauges.

    Arduino Uno is perfect, it is the same hardware as nano.What are you trying to levitate? do styrofoam particles of 2mm work?

    there is a smaller version named microlev

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

    That is why marking them it is very important, otherwise it will not work very well. Up to date, I have not found a company that marks them correctly.

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

    I usually use 18V, which is more than enough to flip it upside down. Perhaps those transducers are not as powerful as manorshi's?If you want to use 25kHz (To levitate larger objects), I would recommend building BigLev (step 23) https://www.instructables.com/id/Acoustic-Levitator/ since 25kHz transducers are weaker than 40kHz and you will need a standing wave. In step 23 I have added a simplified code that cannot move the particles but it is easy to adapt for different frequencies.

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

    Nor the oscilloscope neither the arduino method work?In the video of this instructables the oscilloscope method is shown with more detail: https://www.instructables.com/id/Acoustic-Levitator/

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

    The peak to peak voltage on the transducers is double the input voltage because they work using push-pull.The L297N is actually used to drive 2 DC motors, you cannot double the voltage but you can invert the rotation direction.Best.

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

    Those transducers seem ok. Could you point the bowl into a water surface, that way you will be able to "see" the field. If it looks like a single dimple in the water then some of the OUT1,OUT2,OUT3,OUT4 wires should be swaped. If it looks like two dimples then it is correct () .https://www.nature.com/articles/ncomms9661 Figure 3.d If your oscilloscope have two channels you can also try to connect two transducers to the probes and check that the halves of the bowl are emitting out of phase.

    Mmm not safely I think, you can get some cheap usb chargers. In the components sections there are some links to it.

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

    It is explained in this paper http://ieeexplore.ieee.org/document/8094247/

    You will need to use 2 timers, one for each array. Remember that those transducers will only operate at 40khz+-1khz, they are quite narrowband. By using slightly different frequencies you can create travelling waves, but I do not think the Arduino has enough resolution for that.

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

    All the transducers are emitting, a standing is create between the two halves, particles get trapped in the nodes. For more information you can check the open access paper http://scitation.aip.org/content/aip/journal/rsi/88/8/10.1063/1.4989995 or the video by Physics Girl https://www.youtube.com/watch?v=ABjRnSYw-4k&t=2s Thanks

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

    They are quater wavelenght grid, to cancel reflections at 40kHz but I have never measured how effective they are.

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

    Right.I would recommend delayMicroseconds.Best.

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

    In this instructable we use 10mm transducers: https://www.instructables.com/id/Acoustic-Levitator/

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

    Looks like a proper scientific instrument now.

    That looks amazing. To cut it I use an ultrasonic knife, it works great on plastics. I will try to publish an instructables on it since the commercial ones are a little bit pricey. I also use a dremel with a filing tool to drill through the bases, I know it is not ideal but it does the job.

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

    That is really good work Max. If you enjoyed the project, soon we will publish similar Instructables. Next one will be a directional speaker or also called audio spotlight.

    If you are using an Arduino clone (totally recommendable since they are only 3$) you will need to install the drivers that are mentioned in the Instructables. When you plugin the arduino you also need to select nano (or the one you are using) and the correct COM.

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

    I wish I could find more efficient transducers but it seems easier to increase the voltage of the excitation signal.The best option would be to find a tiny transformer with a ratio of 1:2 or 1:4. Otherwise just use a l293d combined with a boost converter to get more voltage: XL6009 are quite small and cheap in Amazon.

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

    That is great. Do you mind if I add the link in the Instructables?

    For styrofoam you can probable use just 6V, it still gets hot with that?In any case, it is amazing to know that it can run for 1 week.

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