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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Embedded C programming to interface ultrasonic sensor to 89s51 microcontroller

I am trying to interface an ultrasonic sensor HC-SR04 to a 51 family microcontroller like 89s51. After learning about how ultrasonic sensor works I wrote a program as per my knowledge about ultrasonic ...
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18 views

What type of transducer is necessary for building an ultrasonic oil diffuser?

So i have recently started a project to build an ultrasonic oil diffuser. Right now i am looking for the right type of transducer to aerosalize the oil. I am not sure what type of transducer i need or ...
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3answers
60 views

How to measure output of the ultrasonic transducer?

I have found a test circuit for the ultrasonic transducer. How do I measure the output distance sensed by the ultrasonic transducer using my Arduino Uno R3? Please help. I have attached the test ...
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48 views

Ultrasonic distance sensor with no microcontoller

For a task we have to come up with a way to use a 40 kHz ultrasonic transmitter and receiver pair to measure distance. The output must be an analogue signal proportional to the distance to the object. ...
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31 views

Ultrasonic transducer driver/receiver ultralow power issues

I'm looking how to easily drive ultrasonic transducer Prowave 500MB120 or similar from MSP430. I found TI: Ultrasonic Distance Measurement With the MSP430 and AnalogDevices-Ultrasonic Distance ...
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37 views

Standalone Ultrasonic speaker with preprogrammed frequency

I've been toying around with some Piezo speakers for my Arduino. Now I've been wondering if there is a way to remove the Arduino from the equation. It only serves as a power supply for the speaker. ...
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1answer
65 views

Ultrasonic transducer for fish finder - TD02002

I am looking to construct an MCU based ultrasonic fish finder. I have found a potential component that is a transducer called the TD02002 which can be found here: ...
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44 views

Ultrasonic sensor pair operation

I have had success with using SR04 to measure distance from the SR04 location to nearest obstacle. Now I want to be able to measure distance of two mobile location one mounted with ultrasonic ...
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35 views

Ultrasonic High Voltage Generation

In non-Destructive Testing aplications it is required to drive transducers with high voltage pulses. Generally high voltage range change from 60v(for example medical aplications) to 200v(NDT). Two ...
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2answers
77 views

A question about ultrasonic sensors in general

Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver? Or do they send out a wave which ...
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1answer
135 views

outdoor ultra sound positioning system robotic lawn mower [duplicate]

I have a dream to build robotic lawn mower that uses a positioning system, so that can cut grass once and effective. Building the robotic lawn mower is not a problem, but the navigation system is, so ...
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2answers
232 views

What is the purpose of the resistor connected across ultrasonic receiver terminals?

I have seen a few circuits where a resistor is connected across the positive and negative (grounded) terminals of an ultrasonic receiver. It seems to "stabilize" the received signal. I have attached ...
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67 views

9V battery is not able to power 2 sensors. How can I do it?

I wanto to power an IR sensor an ultrasonic sensor (HC SR04) and a sound module APR33A3 IC through a 9V battery connected with a LM7805. When I connect my atmega32 to the computer and power the ...
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0answers
50 views

make hc-sr04 receive from another one

I have 3 ultrasonic Sensor (HC-SR04), i want to use one of them as transmitter, and the other as receiver, i want to let the first one send ultra Sonic waves and the other receive these waves from the ...
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40 views

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
303 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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2answers
94 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
303 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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83 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
241 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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2answers
143 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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0answers
23 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
3k 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
207 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
99 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
112 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
112 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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63 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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142 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
104 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
279 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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168 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
2k 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
139 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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135 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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50 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
556 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
73 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
170 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
139 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
712 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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1answer
139 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
119 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
2k 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
419 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 ...
2
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1answer
222 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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3answers
292 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
1k 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
289 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 ...