Questions regarding Ultrasonic devices and uses. Ultrasound is higher than the typical human hearing range, with the low end at 20khz. Ultrasonic distance and Proximity meters are common. Be careful around Chiroptera and marine life. Your dog might not like it either.

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Proximity sensor for use in cotton crop field

I need some help. I am planning to make a bot that is supposed to go inspect Cotton crops. For that the bot has to travel in the lane between two crop lines. I want it to be in the middle of the lane ...
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1answer
38 views

Basic Robotics Help. Variable motor speed control by ultrasonic sensor input on arduino

First, thank you for taking the time to read my post. I am attempting to use an ultrasonic sensor to control a DC motor using the PWM output of an arduino. Fairly simple, I know, but I'm just a ...
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33 views

Designnig a Simple Ultrasonic Phased array system

I want to design a Phased array Ultrasonic System, I want to detect pipeline leakage in the PVC pipes so I am going to keep the Array in contact with the pipe, I have retrieved the Tx and Rx from the ...
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2answers
47 views

Ultrasonic HC-SR04

The range of ultrasonic is more than the 20khz Then why does the HC-SR04 states 40hz what is it?? in datasheet it is specified as working frequency? Also the frequency of sound depends on the medium ...
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1answer
258 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
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69 views

ultra sound with pic [closed]

Why does this code divide the time over 29? This code is for connecting ultrasound with PIC. I'm working with a 4 MHz clock and the pic type is P16F877A . ...
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2answers
210 views

Ultrasound in air ranging system design

I'm designing an air ultrasound range finder that bounces ultrasound signals off a person's head to measure the distance of the device from the head. The goal is to get ~1mm accuracy as a device is ...
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0answers
75 views

Under water distance measurement

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
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16 views

T/R switch for single element material thickness testing (-200V pulses)

Our non destructing ultrasonic inspection design now has two crystals, one for transmitting and one for receiving. We would like to have only one crystal for transmitting and receiving. This is common ...
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5answers
2k views

Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
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1answer
117 views

Band pass filter unstable and lower gain than simulation

I’m trying to make an ultrasonic distance sensor and got the 40kHz emitter working but am struggling with getting the receiver circuit working properly. At first I just amplified the output of the ...
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1answer
84 views

Can ultrasound be used to determine distance without line of sight?

Is it possible to determine the distance between 2 devices (using phase shift, time of flight or any other method) without line of sight? In the affirmative case what's the precision and accuracy for ...
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2answers
90 views

Measuring the distance between two points electrically

I am trying to build a real time location system(RTLS). I have a arena of 10 x 10 meters in dimension. And would like to track the position of the object moving in the arena with a precision of within ...
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2answers
74 views

Weatherproofing a cheap ultrasonic sensor

Is there a way to weatherproof a cheap ($15-25) ultrasonic sensor for moderate outdoor use? I know Maxbotix sells weatherproof sensors, but these run for $100 each, which is too steep for my project. ...
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1answer
37 views

Trying to understand directivity of an ultrasonic sensor

I am trying to understand this plot of directivity from the following link: http://www.nicera.co.jp/pro/ut/pdf/T4010B4(ENG).pdf How do I read this plot? I can say that at 0 degree , the energy ...
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0answers
100 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
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2answers
92 views

How to make audio using ultasonic transmitters

I have an idea for a project that involves two ultrasonic beams colliding in mid-air to make a sound. However, I have a few questions. Will this even work? I've read of this type of thing being done ...
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2answers
163 views

How to drive 1MHz Ultrasonic Transducers

I have 2 ultrasonic transducers (see below picture) facing each other with spacing of 10cm (adjustable). I would like to supply 1 MHz sine wave (from function generator) to one transducer ...
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0answers
103 views

Can I use ultrasound to detect metal underground?

I am doing research which aims to detect metal underground. I know that most metal detectors are based on the concept of change of inductance of an inductor caused by mutual inductance with a ...
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1answer
458 views

Creating a home made ultrasound transducer

I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
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4answers
2k views

Why sound wave is the best choice for many location detectors?

So I'm currently working on my high school final project, which is basically a Radar :) ... I'm using the SRF05 detector to detect objects that are near the surface of the device. My current ...
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2answers
96 views

What is the current consumed by Ultrasonic Sensors/Transducers (1-2MHz) to generate Ultrasound waves

I would like to know what is the current consumed by a 1-2MHz Ultrasonic Sensor (i.e sensors used for Clamp on Ultrasonic flowmeter) to generate Ultrasound waves. The two ultrasonic sensor ...
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1answer
98 views

Piezoelectric Transducer, effect of voltage amplitude vs frequency of pulsing signal?

I am not an expert in piezoelectric transducers used for ultrasound applications so I am looking for some insight into the matter. To extract the greatest amount of acoustic energy from the ...
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0answers
40 views

Low cost, light weight, cost effective sensor technology

Is ultrasonic sensor technology the lightest, most inexpensive and most effective for creating an unnoticeable mobile device that can also audibly detect a solid or liquid by an object in motion at ...
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2answers
296 views

What is Sensitivity in an ultrasonic transducer Specification?

So far I understand that Sensitivity of the transducer is defined as the ratio of its electrical output to mechanical input. While going through ultrasonic transducer specs, they have a rated ...
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1answer
65 views

Can I make an ultrasonic motion sensor using one piezotransducer?

I wonder whether I can make a small motion sensor using one piezotransducer with a feedback. It should emit a low-frequency ultrasound (say 33kHz) and I expect to see some signal changes on a ...
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1answer
108 views

Relationship between transducer voltage and sound pressure

I understand that transducers produce a voltage that is approximately proportional to the sound pressure. For a given transducer supplied with 1000mV, how can I work out the sound pressure (Pa) ...
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1answer
99 views

How to package an ultrasonic transducer so it can be submerged?

I'm looking for a way to package an ultrasonic transducer without losing too much power in the process, which will also be an easy to make it so my transducer can be submerged. My system is supposed ...
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2answers
350 views

Ultrasonic Sensor to detect water flow

I am trying to build a small DIY kit that can detect water flow in a pipe using ultrasonic sensor. I have found Ultrasonic Distance Sensor but not Ultrasonic Flow Sensor. Would really appreciate any ...
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0answers
44 views

Sonar sensor constantly gives similar output

I have a somewhat general question about sonar sensors. I have three "SN-HRLV-EZ1" (maxsonar) sonar sensors and I use them to do obstacle avoidance. After a few crashes two of the sonars always show ...
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1answer
112 views

How does sonar locate an object in three dimensional space to output data for imaging?

I'm working on a small learning project where I want to connect sonar back to an android phone over bluetooth. I'm working with an hc- sr04 that a friend gave to me and I'm trying to piece together ...
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2answers
113 views

Could some one explain me technically as to why the bandwidth is severly limited in underwater channel for communications?

I understand that, due to the harsh characteristics of the underwater channel, the effective bandwidth for communication underwater (using acoustics) is severely limited. But i would like to know the ...
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1answer
1k views

Arduino project: ultrasonic sensor + 5M 5050 RGB LED strip lights

I'm relatively new to electronics, and as a newbie, I am seeking advice. I'm my current project, I would like to test out the combination of RGB LED strip controlled by one ultrasonic sensor. I am ...
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1answer
347 views

Losing sensitive data when trying to send them via GSM

I am working on a system which collects data from a set of ultrasonic sensors. Those sensors work at 40Hz frequency, and each data they send are valuable to me. I need to send those data to a mqtt ...
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176 views

Helicopter rotor blade system detection approaching objects

I am working on this project to detect anything that is entering the zone of RC helicopter blades (around 10cm diameter) region and stop the rotor. It needs to detect any solid object so metal or ...
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2answers
233 views

Using ultrasonic sensors to measure distances to multiple objects

I'm doing a project which using ultrasonic sensors to measure the distances to objects. As far as I know the sensor can only measure the distance of the closest object to it. Is it right? And in ...
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4answers
941 views

Calculating Wavelength of sound using an Arduino

I'm using an Arduino Uno R3. I need to measure the wavelength of sound of a particular (known) frequency. By substituting in the equation: Vsound = Frequency * Wavelength ...I wish to calculate the ...
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2answers
207 views

Ultrasound receiver ringing suppression

How can I limit the ringing time and amplitude of an ultrasonic receiver that has just been hit by an incoming wave? [Note - just adding a resistor in parallel does not work well]. Any known ...
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1answer
455 views

How to collimate ultrasonc beam from proximity sensor HC-SR04 in measurng distances of 3 meters?

I am currently doing a project for bicycle overtaking safety in which an approaching vehicle or cycle from behind is found through ultrasonic sensor and indication is given to the rider. I had a ...
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2answers
138 views

Ultrasonic transducer response to harmonics?

Does anyone know offhand whether an ultrasonic transducer will respond efficiently to harmonics of the fundamental? For example, will a 40kHz transmitter also transmit with reasonable efficiency at ...
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2answers
2k views

How to Wire Up Ultrasonic Transducer

I want to use the direct time of flight method to measure the distance between a person carrying an arduino and a certain part of the room. I have come across many different boards which can easily be ...
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567 views

Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
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2answers
188 views

Ultrasonic Frequency to distance

In another post I ask about an ultrasonic radial beacon finder: Does it exist: 360 degree ultrasonic receiver/beacon combo Assuming it exists or I can hack one of those together, would it be possible ...
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2answers
1k views

Does it exist: 360 degree ultrasonic receiver/beacon combo

Note: I posted this over on Robotics but the more I think about it, the more I realize this would be better asked here. Basically, I want to detect an ultrasonic beacon in a radius around the robot. ...
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1answer
266 views

Arduino ultrasonic sensor

I am attempting to read an HC-SR04 ultrasonic sensor at the same time a couple of servos are running. Having a servo running is messing up the timing of the pulseIn() method. The distance ...
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2answers
805 views

Low cost and accurate Sensor technology for detecting objects at short distances (<5m)

I am interested in a project which aims to detect any object within short distances, at various directions. Hence, the sensor should be highly directional, fairly accurate and if possible, compact. ...
5
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1answer
2k views

Driving high voltage to ultrasonic transducer with Arduino

I'm trying to drive an ultrasonic transducer with an Arduino. I have the arduino putting 40kHz out of pin 10 and I would like to step that up from a 5V square wave to 100Vp-p or anything near there. ...
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136 views

How can I trigger an LED with ultrasound

CASE: I would like to trigger a few independent LED's wireless-ly as cheap as physically possible. It is simply a LED connected to a battery. (The LED-part must be cheap, the transmitter does not ...
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2answers
444 views

Q: ultrasonic sensors - distance detection

I have a question about ultrasonic sensors. By connecting the car parking sensor to the scope I always get the same wave. But by changing the distance from the sensor, the parking system respond as ...
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3answers
917 views

How do I choose the correct op amp to amplify a high frequency sine wave (>500kHz)

I am working with ultrasonic transducers (12mm diameter, 500kHz). With my present physical setup, the transmitter is excited with a 3.3V p-p sine wave. The receiver is showing a nice clean sine wave ...