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.

learn more… | top users | synonyms

2
votes
4answers
286 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 ...
1
vote
2answers
71 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 ...
2
votes
1answer
130 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 ...
2
votes
2answers
54 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 ...
2
votes
2answers
512 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 ...
1
vote
0answers
290 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 ...
2
votes
2answers
89 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 ...
1
vote
2answers
197 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. ...
1
vote
1answer
162 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 ...
5
votes
2answers
286 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. ...
4
votes
1answer
492 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. ...
1
vote
0answers
90 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 ...
3
votes
2answers
265 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 ...
1
vote
3answers
414 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 ...
4
votes
2answers
221 views

Which low voltage single supply opamp for ultrasound mic?

I have a problem choosing right opamp to amplify signal from 10KHz-65KHz mic SPM0204UD5. According to microphone's datasheet, it has max output impedance of 300Ω, and supply voltage from 1.5 to 3.6 V. ...
0
votes
0answers
262 views

Differences between HC-SR04 and SRF04

I'm going to make a project using a PIC18F4550 and a HC-SR04 ultrasonic sensor to measure the level of an open oil tank and want to use proteus to debug the program of the microcontroller, proteus ...
4
votes
1answer
457 views

transmit data wirelessly under water?

I am looking into constructing a small submarine with a Raspberry Pi. This is just for a hobby project but my idea is to have it communicate with the surface wirelessly. I know that normal radio waves ...
3
votes
2answers
113 views

Identity of TI mystery chip: CM060B

I am having trouble identifying one of the two ICs on my dog's ultrasonic collar tag. The lettering on the 16-pin SOIC package was obscured by some sealant which I had to scrape away, leaving the ...
3
votes
1answer
226 views

Waterproof sonar?

I'm building sensors for an underwater robot and was wondering if it's possible to waterproof ultrasonic range finders like this one to work underwater. I have made waterproof enclosures before. ...
8
votes
2answers
558 views

Collimating a sonar beam

Wondering if anyone is aware of a way to cause an ultrasonic proximity sensor to be modded, such that, it's forward line-of-sight range remains unaffected, but it's angular spread is reduced, somewhat ...
0
votes
2answers
172 views

SR04 As only Transmitter and Receiver

I have taken up a "follow me" robot as my course project ,i am taking the following approach: Use one SR04 ultrasonic transducer only as transmitter which will be with me. Another SR04 module only ...
4
votes
3answers
3k views

Over what frequency range can the microphone of smartphone receive the sound?

I have a project in which I am considering using the microphone from a smartphone for the reception of inaudible signals (> 15khz). What is the frequency range that such a microphone of receive ...
5
votes
2answers
239 views

Ultrasonic sensor doesnt work inside case

I have a very strange error. My ultrasonic sensor, when both speakers are sticking out of my case, don't work at all. It's a black case. It gives very "near" readings". But it does work when outside. ...
1
vote
1answer
191 views

Ultrasonic Sensor URM37

I have just gotten a URM37 ultrasonic sensor. I need a way to measure the distance to an object from two sensors (for maneuvering). Can I know if ultrasonic sensors with 2 sensors are suppose to be ...
1
vote
2answers
172 views

Can this ultrasonic emitter be DC driven?

The datasheet of this ultrasonic specifies that the maximum driving voltage is 10 Vrms, which suggests that it should be driven by an AC. Is my assumption correct? ...
7
votes
1answer
265 views

What is the “loaded resistor” for ultrasonic receivers?

I have an ultrasonic receiver (datasheet available here). On page 2, there are two graphs plotting sensitivity variation and center frequency shift versus "loaded resistor": What does "loaded ...
4
votes
3answers
251 views

Reduce and clip voltage of a 5Mhz ultrasonic signal from +-50V to 0-3.3 V

I know there are a lot of posts similar to this one but some differences make it worth posting it. I’m working on a project where I have a 5MHz AC signal with the largest amplitude of +-50V. It’s an ...
6
votes
2answers
2k views

Underwater distance measurement/Sensing

I am working on a project from University which includes a ROV. I am trying to come up with an easy way to create a Distance Sensing system, which doesn't require a lot of work. something very simple ...
0
votes
1answer
223 views

Coherence factor in Delay-And-Sum-Beamformer: Triangle Inequality

I'm writing a delay-and-sum-beamformer in MATLAB that incorporates a so-called and widely used coherence factor CF. Now I'm confused about the math behind that ...
6
votes
4answers
268 views

Time of flight difference in hardware

I have an ultrasonic emitter, and two ultrasonic receivers. When the emitter emits a pulse, the receivers get the signal at different times. I am only interested in the difference between the two ...
2
votes
2answers
348 views

What ultrasonic sensor+emitter should I use for my medical ultrasound project?

I'm building a medical ultrasound scanner as an educational DSP project. I'm not expecting to produce something medical grade, but I do want to be able to detect the location of a high-density ball ...
2
votes
2answers
626 views

Interfacing ultrasound receivers and emitters with a microprocessor

I have bought ultrasonic receivers and emitters to play with (see datasheet here). I also have an STM32 processor devkit with DAC and ADC pins readily available. How should I connect the ultrasonic ...
8
votes
1answer
1k views

Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?

Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave? My parameters: Frequency band of interest: 20KHz to 100 KHz, sine wave ...
2
votes
1answer
4k views

Connecting multiple ultrasonic sensors to one Arduino

I'm trying to connect five ultrasonic sensors (HC-SR04, to be exact) to an Arduino board to detect obstacles in five directions (four cardinal + one Z-axis). I read the datasheet on the HC-SR04s and ...
9
votes
3answers
3k views

Driving 50W-250W ultrasonic transducers with sine: Any Class B 135KHz monolithic power amp ICs?

My project needs to drive a medium power ultrasonic piezoelectric transducer from a sine wave (/ sawtooth) sweep generator that sweeps +/- 2% of the transducer resonant frequency. The question: What ...
3
votes
2answers
432 views

Ultrasonic rangefinder (for beginner)

I'm quite beginner in electronics. So, to begin with, I wanted to make a simple (?) ultrasonic rangefinder, based on microcontroller. So I had a few questions for experienced in electronics: What ...
0
votes
0answers
881 views

What sensors are commonly used for vehicle detection?

I want to make a vehicle detection prototype. I find there are multiple choices of sensors that can be used to detect a vehicle, such as acoustic, ultrasonic, infrared, magnetic inductive sensor. I ...
2
votes
1answer
2k views

Ultrasonic Transducer driver

I found some youtube vids on Ultrasonic Cleaning, and thought it would be a cool DIY project. On eBay I found this. Some other transducers in the same range requires 400-800V supply. Anyone have any ...
3
votes
4answers
1k views

Replacement Transistor for Ultrasound Cleaner

I'm trying to repair the generator board on a Sonix IV ultrasound cleaner. I need to find a replacement for a transistor (in a TO-3 package), but the manufacturer uses an in-house part id, so I'm ...
6
votes
3answers
306 views

Interfacing Lego Mindstorm with ultrasonic transducers and actuators

I'm very new to electronics. I'm working on my school science project and am having difficulties to turn theory into praxis. For my science project, I'm aiming to construct a device that will enable ...
1
vote
1answer
100 views

navigating every spot of a room [closed]

I want to build a robot that will navigate over every spot it can in a room. But i thought some kind of a laser to map the room would be best or maybe a ultra sonic sensor. Could anyone guide me in a ...
0
votes
1answer
3k views

STM32F4 Discovery board and HC-SR04

I've connected the sensor this way, from Sensor to Board: VCC -> 5V GND -> GND Trigger -> PD15 ( same as blue led ) Echo -> PA0 ( same as user button ) My C program send the trigger, reads the ...
3
votes
2answers
2k views

Multiple Ultrasonic Rangefinder Question

I've been doing some research on ultrasonic range finders as sensors for robotics. I've seen them being attached to servos and pivoted to effectively "look" in front of the robot and make sure the ...
3
votes
2answers
3k views

Building an Ultrasound Generator

I need to generate ultrasound with a frequency of 1.5 MHz. The ultrasound should be pulsed as shown here An ultrasound pulse should be 200 µs long, a pause (no ultrasound) is 800 µs long. The ...
4
votes
3answers
524 views

Is there an I²C device out there for reading a set of PWM inputs?

I'm thinking about getting a bunch of Maxbotix Ultrasonic rangefinders. I'd like to use as few pins on my controller as possible. Since I don't think you can have multiple devices on an RS232 serial ...
3
votes
1answer
303 views

Capture Olympus 5800PR US pulser/receiver data on my laptop

Im tryng to place some ultrasound experiments at school and i have this pulser available (Olympus 5800PR), the problem is that i dont know how to capture the data on my laptop. I know i have to set an ...
3
votes
3answers
326 views

ultrasonic setup guide

Does anybody know of any online resources that go over the setup of driving ultrasonic transducers, as well as how to receive an ultrasonic echo, and pick it out (for rangefinding)? I found one ...
11
votes
2answers
4k views

How do I drive an ultrasonic transducer with an Arduino?

I am attempting to build a cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the 'blast' that ...