author
2Instructables183,494Views160CommentsBristol, UKJoined August 29th, 2016
Do you want to build your own cutting-edge devices? Directly from the research lab. Ultrasonics, Electromagnetism and more. Researcher at Bristol University interesting in Ultrasound and in general any effects that waves can produce.

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Arduino Contest 2016
Contest Winner First Prize in the Arduino Contest 2016
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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 day ago
    Acoustic Levitator

    That is amazing work. One cool option could be to use UV paint (or just highligther) and use UV LEDs. Best, Asier.

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

    with 7V should be more than enough to levitate styrofoam. Take tiny particles and put in the center like at the end of the video.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator5 days ago
    Acoustic Levitator

    You do not need to keep connected GND to D2. It is only when you want to move the particles up. There should be a wire connecting D10 to D11.

    You have some constants 0x that are used to define the waves in terms of phase for each channel. It should be possible left and right but not the other directions. If you want full movement you will need a driver board with more channels. Soon I will put an instructables for it: http://ieeexplore.ieee.org/document/8094247/metrics although it is quite a complicated project.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam1 week ago
    Acoustic Tractor Beam

    At the end of the video it is shown how to place the particles in the levitator.

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

    I will test to drive 2 transducers directly from the Arduino (10Vpp max) and report the results.

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

    Looks really good man. 1Amp would be perfect.For portable stuff I recommend a 7.3 Lipo battery and a DCDCconverter like in this Instructables https://www.instructables.com/id/Acoustic-Tractor-Beam/

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

    Are the transducers legs making good contact with the wires?What if you flip the transducer?I will give it a try. I only tested with 5 transducers and it seemed to work. I will try again with others.

    I have managed to mark 80 transducers. There are some key points: - do not touch any metallic part (either the transducer or the wire) while you are doing this or you will discharge.- Mark the A0 leg if the signal goes up or caps at 1023 (maximum value).- Mark the GND leg if the signal goes down or caps at 0 (minimum value).How is it working for you?

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  • Asier Marzo followed How-ToDo and darbinorvar2 weeks ago
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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam2 weeks ago
    Acoustic Tractor Beam

    I was testing right now if it is possible to do it with the same ArduinoNano. I will report ASAP.

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

    PLA, the nozzle was 0.4mm I used the fast settings in Cura in a ultimaker 2.0 extended +. It took around 4 hours.I also tried with a makerbot 2.0 using the fast settings and it worked fine.

    Do you have a power supply with at least 6v and 600ma? If you could provide 9v and 1a that would be perfect. most dc adaptors will do that.

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

    Are all the lights on (driver and Arduino)? When you put particles in the levitator do they at least move a little bit? What power supply are you using (volts and maximum current)? Do you access to an oscilloscope?

    Sounds good, using 7 in a flower pattern (the one in the center should reverse polarity) also gives quite good results https://youtu.be/vLCrm6gos4w?t=50s

    The outputs look perfect. Could you connect a transducers to the oscilloscope and use it as a microphone to detect if the transducers from the levitators are emitting? also, it is much easier if the particles are spherical and around 2mm diameter.

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

    Are the red lights on the arduino and the driver on?Can you connect one transducer to the scope and use it as a microphone to detect if the transducers are emitting waves at all?Can you check the signal at Gnd&A[0..3] to see if you can see half-square waves of 5Vpp?Can you check the signal at Gnd&OUT[1..4] to see if you can see half-square waves of 10Vpp?500ma could not be enough do you have an adaptor that can provide 1A?Best,Asier.

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

    Hi,Glad that you like it.Building UltraTongs should be easy and cheap. You need 2x7 10mm diameter transducer for each.I would recommend the driver board from the Instructables "Acoustic Levitator" it is simple and uses push-pull (double the voltage on the transducers) otherwise you can just use the tractor beam circuit with 24V on the DC converter.Using the Acoustic tractor beam driver. Connect one channel (OUT1 for instance) to the positive legs and GROUND to the negative legs of the transducers of the 6 outer transdsucers, The inner transducer should be connected with reverse polarity (GND to the possitive and OUT1 to the negative). You can use different OUTs for each 7-transducer array to balance the load.Using the Acoustic Levitator driver, connect OUT1 to the positive leg...

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    Hi,Glad that you like it.Building UltraTongs should be easy and cheap. You need 2x7 10mm diameter transducer for each.I would recommend the driver board from the Instructables "Acoustic Levitator" it is simple and uses push-pull (double the voltage on the transducers) otherwise you can just use the tractor beam circuit with 24V on the DC converter.Using the Acoustic tractor beam driver. Connect one channel (OUT1 for instance) to the positive legs and GROUND to the negative legs of the transducers of the 6 outer transdsucers, The inner transducer should be connected with reverse polarity (GND to the possitive and OUT1 to the negative). You can use different OUTs for each 7-transducer array to balance the load.Using the Acoustic Levitator driver, connect OUT1 to the positive legs and OUT2 to the negative legs (please reverse the polarity of the central transducer). If you use OUT1&OUT2 for the bottom array and OUT3&OUT4 for the top array, you will be able to move particles up and down.Best,Asier.

    Half a volt is not very significant. Perhaps the driver is broken?

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    That sounds great. Good luck with it.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam1 month ago
    Acoustic Tractor Beam

    Hi Ain,You can use the code provided in the instructables. What short of modification you would like to make to it?Best,Asier.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    Before putting the transducer on the sockets, apply a blob of hot-glue using a hot-glue gun. Once that you socket the transducer press the top with the fingers to fit it as well as possible. The transducers should be fixed by the hot-glue not by the soldering. I have added links to the exposed wire for UK or USA in the Instructables.It does not matter if the transducers are not perfectly orientated.

    Could you connect D10 to D11?

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    I know they say they are 40khz and 10mm. But if you check the specs they are 16mm and 38kHz.I totally recommend Manorshi or Ningbo (the ones that I give links for) if you ask them they can send you 75.

    I used the approach described in this paper: http://aip.scitation.org/doi/full/10.1063/1.4989995If you put just 2 transducers opposite to each other it will work as long as they are not separated more than 5cm or so.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    The components can be purchased for around 70$ but it is quite tricky to get the the transducers for a good price. I recommend contacting the two companies that I mention (Manorshi, Ningbo) since they will provide 75 transducers for a reasonable price.Best,Asier.

    View Instructable »
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    Send it through msg.

    I used 3D studio to design it. If you want I can send the max file, what is your e-mail?Best,Asier.

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  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    Glad that you like it. There is a research paper that studies the effects of acoustic levitation on different creatures: http://aip.scitation.org/doi/abs/10.1063/1.2396893?journalCode=aplFor the moment the biggest thing that I have seen levitating is an apple.

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  • Asier Marzo's entry Acoustic Levitator is a winner in the Make It Fly! Contest 2017 contest 1 month ago
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Levitator1 month ago
    Acoustic Levitator

    thanks klettervirus, I will try to add a tiny section for using the Arduino Nano as a tiny oscilloscope. It does the job decently.

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  • Asier Marzo's entry Acoustic Levitator is a finalist in the Make It Fly! Contest 2017 contest 1 month ago
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam1 month ago
    Acoustic Tractor Beam

    Hi, glad that you like it.to move the focal point we change the phases. Each period is divided into 24 steps of 0s and 1s by shifting the patterns we change the phase:000000000000111111111111 -> phase 0000000111111111111000000 -> phase pi/2the phases are precalculated for the different points and hardcoded in the code (that is why there are a lot of hex constants).Best,Asier.

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

    The voltages seem perfect. Only think I can think is not having enough amps from the DC adaptor. Could you try to provide 6 or 7V? That should be enough to levitate styrofoam particles and will consume certainly less than 1Amp.

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

    They would only cancel each other if they were propagating in the same direction but since they are counter-propagating they always create the standing wave pattern. With liquids it is more tricky to move them up/down.

    Yep, I usually use a regulated supply. Depending on the voltage you will change the shape of the droplet.

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

    If what you are levitating is not very heavy (i.e. styrofoam) you can rotate the levitator 360deg and the particles will still be trapped.

    Mmmm water certainly not and ethanol will pop. Liquids will not levitate sidewise.

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

    Any transducer will do the job. I will provide designs for both 16mm and 10mm transducers.

    I do not think so. If you do not have a scope there are several instructables for making one just with an Arduino nano.

    I can confirm that. If you find a good provider in alibaba and do not mind purchases in big packs, then it is amazing.

    How many volts are you providing to the device and how many amps is it consuming? If you had a scope you could test if the arduino is generating 5V signals and if the driver is amplifying them. There are some simple tutorials for creating a scope with an arduino.

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

    With the scope you should be able to check if the Arduino is generating logic signals and if the Driver is amplifiying them. I recommend running the device at 20V (no more than 25V) I think it should consume more amps at that voltage.

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

    Thanks for the pictures. Is D10 connected to D11?Are the red lights of the Arduino and the Driver on?

    Is there a jumper between D10 and D11? In other words, D10 and D11 need to be connected. If you see no signal in A0 when those pins are connected then something must be going on with the arduino. Best.

    Do not be disappointed with the tractor beam, it can levitate things upside-down but it is much weaker than this standing wave levitator. It can only levitate Styrofoam. Kindly, let me know if you get any results with the schilieren, we had it working in water but no luck for acoustic waves in air. Although this videos shows that it is possible https://www.youtube.com/watch?v=XpNbyfxxkWE

    congrats, looks very well done. Hopefully I will be able to release a directional speaker soon, I imagine people getting tired of levitation : )

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

    How low the voltage went? the ideal value would be 20V int the DCDC converter. It will not be able to produce less than the input voltage.Do you have a scope to test if the Arduino is generating the signal and if the driver is amplifiying it?

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

    Very good job, congrats. In a couple of months I will try to publish the instructions for a directional speaker. The hardware is pretty much the same so I bet you could build it easily.

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

    The acoustic output should be as high as possible. Bear in mind that the phase deviation should be low and that the transducers with high Acoustic Output also occupy more surface (larger diameter). For 10mm the best are the Murata but they are pricey as hell, Ningbo and Manorshi are quite good options, they have given me very good results.

    Both Ningbo and Manorshi for the 10mm ones are quite good. http://aip.scitation.org/doi/suppl/10.1063/1.4989995/suppl_file/si_4_am.pdf

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

    They seem fine but I cannot guarantee since I have never seen that model.

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

    So each unit is 1.12$? I guess it is not that bad but if you order 500pc it should be around 0.4$ each.

    1) you can test INx first to see if you get the signal at 5V and then OUTx to see if you get the signal at 2xInputVoltage. That way , it is easier to check where is the failure.2) you have to put a jumper (or a female-female connector) between D10 and D11.

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

    That +/- mark that they have is useless, sometimes it is wrong. We mark their polarity to get the correct + and - leg. When you create an array for continous excitation, it does not matter if you put all the + legs pointing towards the center or all the - ones, as long as they are all the same (all pointing towards the center or all pointing towards the exterior).

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

    What brand are they? It is strange but for some brands the receivers are more powerful than the emitters. Do you have an oscilloscope at home? If so it is quite easy to test the output power of the transducers.

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

    If the spike goes up -> mark the positive leg (the one connected to the positive part of the probe).If the spike goes down -> mark the ground leg (the one connected to the negative/ground part of the probe).Once that you have marked all the transducers it does not really matter to put the positive legs towards the inside or towards the outside. The important thing is that they all have the same orientation.

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

    Could you post a picture of the driver with the connections?

    For complete 3D control we were using an independent channel for each transducers. We were going to publish a driver board based on Arduino MEGA that can drive 64 channels, although it is a little bit tricky with the electronics. We also include software to control any array. The research is still under review but if you send me private message with you e-mail I can send the stuff to you.

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

    They should be fine. If you are going to use 16mm diameter transducers you can only use BigLev or MidLev. BigLev needs to be 3Dprinted in two parts and then glued since it will not fit the printer. At the end of the Instructables I have just added MidLev a levitator that uses 16mm diameter transducers but that will fit most of the printers, it can also levitated liquids.

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

    Thanks man. Glad that you like it, next one should be a directional speaker but I really want to release it when the sound quality is as good as the commercial ones.

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

    They serve 2 purposes:- main one is to reduce reflections. They are quater-wavelenght size so the waves that get reflected on the bumps are 180deg out of phase with the waves that reflects on the holes, therefore they cancel each other (to some point).- Ruler. When you have pictures you know that each of them is 4mm.

    That happens with all the transducers? Sometimes we get some transducers that produce a lot of noise when connected to the scope, reversing the polarity usually solves the problem. Is it 50Hz noise? I imagine the sensitivity could be too high and the poking needs to be done inside (through the metallic grid with a thin wire or needle), touching the topCenter of the little cone that is inside the transducers.

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

    It is hard to say, if you keep the distances and the transducers are pointing towards the center it should work. At least for low-density stuff like Styrofoam and some insects.

    Send me a message. thanks.

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

    Actually when I measured TX and RX transducers there is not a big difference in term of power. But yeah, it will be better if you can get only TX transducers.

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

    Those tests that you did are quite good.1. The bowl has a single focal point, it can move the particles because it changes the phases of the signals.2. Those devices are less powerful.3. That would be one solution.In any case, if you want to levitate heavy stuff I totally recommend you the Instructables that just got published ( https://www.instructables.com/id/Acoustic-Levitator/ ). It can levitate water, insects and even glass.

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

    They look fine, it seems that they are 9.9mm diameter which is perfect, although I have never seen metal ones of that diameter. It is better if you get only transmiters.

    What picture do you think is incorrect? Would you be kind enough to tell me which link is not working? Thanks.

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

    Droplets pop more easily and need to be smaller but it is still possible.

    I evaluated several transducers here http://aip.scitation.org/doi/suppl/10.1063/1.49899...MSO-A1640H10T gave the best result

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

    You could try to use only 6 transducers at each side if you only want to levitate styrofoam or light stuff. 36 transducers at each side is designed for water, insects, ferrofluid or even fused silica. Getting two big speakers (cleaning transducers) also works but they function with high-voltage and may need a steel horn on top to radiate properly.

    That would be great, I also published an Instructables about a tractor beam and had a directional speaker on its way. I have not received your message yet.

    Thanks. For XYZ control, it is necessary to have individual control on the phases of each transducers. Like in this paper: https://www.nature.com/articles/ncomms9661 video: https://www.youtube.com/watch?v=g_EM1y4MKScI have a paper in review that describes how to build a shield for an Arduino Mega that would provide 64 individual channels. I will try to publish it soon although it is a little bit more complicated to assemble and it is not very interesting for most of the people.

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

    Sourcing the parts correctly it should be less than 80$ in total, I have tried to attach the cheapest providers.The driver (L298N) is around 1.5$ and you can get an Arduino Nano for 3$. The DC power supply is 12$. The switch, DC barrel and wires will be around 6$. The transducers are the most expensive part since you need 72. You can purchase them for 0.4$ if you get 500, a little bit more pricey if you order less. However, if you are into this sort of projects I recommend to get some extra transducers, a Directional Speaker is on its way.

    Thanks. Yep, I reckon that for levitating Styrofoam placing 6 transducers at each side should do the job.

    You are right it is possible to levitate using only one side (as in the other Instructable about acoustic tractor beam). However, with two surfaces you create a standing wave between them. A standing wave is much stronger than a single-beam allowing you to levitate liquids and other solids. There is more info in the open paper http://scitation.aip.org/content/aip/journal/rsi/88/8/10.1063/1.4989995

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  • Asier Marzo entered Acoustic Levitator in the Make It Fly! Contest 2017 contest 3 months ago
  • Asier Marzo commented on Asier Marzo's instructable Acoustic Tractor Beam3 months ago
    Acoustic Tractor Beam

    Could you post some pictures of the driver?Are all the red lights from the Arduino, DCConverter and Driver on?

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

    Could you send me an email to amarzo@hotmail.com, we have a paper that explains how to use the software but it still has not been published. I can send it to you.

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

    For doing that you will need individual control on each of the transducers (one channel per transducer). We will publish soon a driver board capable of controlling 64 channels as well as software to create traps at arbitrary positions. If you give a thorough read to this paper http://aip.scitation.org/doi/full/10.1063/1.4972407 there is a clear formula for calculating the phase.

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

    Yeah, by single-axis I mean a standing wave one.The 10mm from Manorshi are not as good as the Murata but they are certainly much cheaper and can do the job almost as well. I almost always use the Manorshi.Same signal as you said just use the 1 OUT of the L298.

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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.1) for the pinch you will need the 10mm transducers. I used the lasercuter to create the base, but you should be able to cut manually a piece of plywood or just use perfboard. It is just 7 transducers in a hexagonal pattern with the central one out of phase. Feed the same signal into all the transducers but flip the polarity of the middle transducer. 2) for the tubes you need a 8x8 flat platform of 10mm transducers. you can feed the same signal to all of them.If you like levitaiton keep in touch, we are about to publish a single-axis levitator that can levitate liquids and insects. It uses either the 10mm transducers or the 16mm.Best regards,Asier.

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

    1. With the current approaches the object size is limited to aprox. half-the-wavelenght, so as you said the only way is to decrease the frequency, there are comercial transducers operating at 32 and 25kHz but they are a little bit pricey. I have levitated 0.5mm objects at 40khz but I do not know what is the minimum size. How the frequency affects the power is tricky because different factors: ++ higher frequency is more directive so the energy gets more focused, -- higher frequency attenuates more while travelling through air, ++ high frequency carries more energy.2.I think so. Although very small objects behave strangely and may orbit around the nodes instead of getting trapped into them.3.Yeah for denser objects you need more force, therefore more pressure, therefore more voltage. How...

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    1. With the current approaches the object size is limited to aprox. half-the-wavelenght, so as you said the only way is to decrease the frequency, there are comercial transducers operating at 32 and 25kHz but they are a little bit pricey. I have levitated 0.5mm objects at 40khz but I do not know what is the minimum size. How the frequency affects the power is tricky because different factors: ++ higher frequency is more directive so the energy gets more focused, -- higher frequency attenuates more while travelling through air, ++ high frequency carries more energy.2.I think so. Although very small objects behave strangely and may orbit around the nodes instead of getting trapped into them.3.Yeah for denser objects you need more force, therefore more pressure, therefore more voltage. However,those transducers usually cannot take more than 40Vpp and the driver will definetly overheat. If you want to levitate heavy objects I recommend to use our upcoming single-axis levitator.Instructables: https://www.instructables.com/member/Asier%20Marzo/Youtube: https://www.youtube.com/user/asiermarzoTwitter: @AsierMarzo

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

    Thanks to you Fred, that looks amazing.

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

    Hi. The STL for the bowl is designed to support 16mm diameter transducers. Most of the transducers that I have seen are either 16mm or 10mm diameter. perhaps the easiest way is to scale down the bowl to fit the transducers.

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

    Sounds like a strange behaviour. Could you try to bypass the button pad (the problem may be in it) and directly connect GND to D2 (down), D3 (up) or D4 (reset) with a jumper wire to check if it works properly. Best Regards, Asier.

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

    It is hard to say. The size and power seem ok but the problem may be the phase deviation, especially between the emitter and receiver. Put all the Ts in one half and all the Rs in the other.Best regards. Asier.

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

    Hi Andrea, if there is no load at the output, it is common to see those spikes in the amplified signal. There should also be some spikes on the top but the scope may cap at 20Volts.Also, in theory sinusoidal waves instead of half-square should be used for feeding the transducers but in practice the transducers are so narrow band that the output is still sinusoidal.The important part is the output of the transducers. You can connect a transducer to the scope's probe and check the sound output.

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

    Hi Mayank, it could be hard to modify the arduino code without affecting the output frequency. What I would recommend is to reduce the variable BUTTON_SENS until the reponse is as fast as you need and use another arduino to control the D2 or D3 pins as needed (ground to activate them and 1 as default, remember that they are pulled-down to avoid accidental activation by noise).

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

    Hi evil_scientist, that is very good work, glad that you enjoy acoustic levitation. You are right for the other arrangements a phased array is required with at least 64 channel, I made a driver board based on arduino that we use for some of our current experiments. Of course, I am planning to release it but it will take some time to put it together. But in a couple of months we want to release a single-axis levitator capable of levitating liquids and ants, as well as a directional speaker. All these projects are based pretty much in the same hardware so I guess that you will enjoy it. Best, Asier.

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

    Hi Cole,The noises should only be there when you move the bead. Getting popping noise could because not enough current can be provided or one the connections is a little bit loose, do the LEDs also blink with the noise?High pitch sounds are because something is touching the pistons of the transducers, that happens a lot when beads get inside or if you are using metallic grid transducers, the grid is in contact with the piston. You can use a thin tweezer to pull the grid outwards.I see three types of scaling:- distance: a bigger bowl with more transducers.- bigger objects: only way is using less frequency. Which is not feasible since 25kHz transducers are massively expensive.- more dense materials (like liquids): I would suggest to go for a standing wave levitator. I am putting an instru...

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    Hi Cole,The noises should only be there when you move the bead. Getting popping noise could because not enough current can be provided or one the connections is a little bit loose, do the LEDs also blink with the noise?High pitch sounds are because something is touching the pistons of the transducers, that happens a lot when beads get inside or if you are using metallic grid transducers, the grid is in contact with the piston. You can use a thin tweezer to pull the grid outwards.I see three types of scaling:- distance: a bigger bowl with more transducers.- bigger objects: only way is using less frequency. Which is not feasible since 25kHz transducers are massively expensive.- more dense materials (like liquids): I would suggest to go for a standing wave levitator. I am putting an instructables on this one, it can leviate liquids, ants and other interesting samples.Best regards.

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