Ultrasound is higher than human hearing sound.
1
vote
1answer
81 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. ...
5
votes
0answers
53 views
Robotics Location Following and Tracking? [migrated]
I am building a robot that will follow a target as the target moves around. I would like some help with the setup for tracking the target. The most obvious solutions are Ultrasound or Infrared ...
8
votes
2answers
256 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
77 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 ...
0
votes
0answers
73 views
Ultrasonic agitation of cooling bath [closed]
I am chemist, sorry for being incompetent in my "language".
I would like to create a (heat insulated) cooling bath in which the temperature is maintained by adding solid carbon dioxide (dry-ice) to ...
3
votes
4answers
581 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 ...
4
votes
2answers
132 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
109 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
95 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? ...
6
votes
1answer
192 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
154 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 ...
5
votes
2answers
474 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
119 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
210 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 ...
1
vote
1answer
173 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
416 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 ...
6
votes
1answer
468 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
2k 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 ...
6
votes
2answers
2k 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
345 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
613 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
981 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 ...
1
vote
2answers
521 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 ...
5
votes
3answers
256 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 ...
-5
votes
1answer
481 views
How can I make an ultrasound transmitter like that one? [closed]
Here is the target url http://allthingsd.com/20110602/demo-at-d9-ubeam/
I am interested in repetition of Perry and Dweck's charge system. I've seen the Power Supply, that they used, but I can't see ...
1
vote
1answer
90 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 ...
-1
votes
2answers
807 views
Ultrasonic generator circuit [closed]
I want to make a 1MHz ultrasonic generator with output in pulse or continuous form as well as high intensity. I got one circuit board of a scrap physiotherapy equipment. It basically consists of a 2 ...
0
votes
1answer
2k 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 ...
2
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 ...
2
votes
2answers
2k 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
330 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 ...
2
votes
1answer
256 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
284 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 ...
9
votes
2answers
3k 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 ...
