When we hear the word “Ultrasonic” we often refer it to bats and dolphins communication. Technically, “Ultrasonic” applies to sound that is anything above the frequencies of audible sound, and includes anything over 20kHz. Frequencies used for medical diagnostic ultrasound scans extend to 10 MHz and beyond. This dog repellent ultrasonic circuit will chase away angry dogs. It comprises of a 555 timer IC, a speaker/piezoelectric and a little ferrite transformer.
The main part of this circuit is a 555 timer IC. A 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flip-flop element. Derivatives provide up to four timing circuits in one package. You can use the 555 effectively without understanding the function of each pin in detail. Frequently, the 555 is used in astable mode to generate a continuous series of pulses, but you can also use the 555 to make a one-shot or monostable circuit. The 555 can source or sink 200 mA of output current, and is capable of driving wide range of output devices.
To use this circuit adjust 4k7Ω Resistor at resonance frequency of the piezo transducer for maximum amplitude of the repeller ultrasonic sound. At 11 KHz to 22kHz this can reach a value of 10Vpp and the buzzer is a passive one (without generator).
Note: Ultrasonic frequency must be set with a dog nearby.
NC Push Button
Dog Repellent Ultrasonic Circuit 2 – [Link]
by lfaessler @ soldernerd.com:
My aim is to build an ultrasonic anemometer based on a Arduino Uno board. Now what’s an anemometer? That’s just a fancy name for a wind meter. I want to be able to measure both wind speed and wind direction with high accuracy. Most wind meters are of the cup or vane variety. They turn wind into mechanical motion and then measure that motion to calculate wind speed and possibly direction. An ultrasonic anemometer on the other hand sends and receives ultrasonic pulses and measures the time-of-flight. From the time-of-flight (or the time difference, depending on your approach) you can then calculate the wind speed in a given direction. Add a second pair of senders and receivers at a 90-degree angle and you get both wind speed and direction.
Arduino Ultrasonic Anemometer – [Link]
When MC Hammer rapped ‘You can’t touch this’ little did he know of the work being carried out by a group of scientists at Bristol University. The team led by Dr Ben Long and colleagues Professor Sriram Subramanian, Sue Ann Seah and Tom Carter have produced an ultrasonic sound system able to generate 3D shapes in mid-air that can be felt.
Tactile Holograms – [Link]
Ultrasonic MEMS microphones can image where your hands are without touching the screen, adding a new dimension of 3-D gesture control to smartphones and tablets: R. Colin Johnson @NextGenLog
Ultrasonic Mic Adds 3-D Mid-Air Control to Smartphones and Tablets – [Link]
by praveen @ circuitstoday.com:
Ultrasonic range finder using 8051 microcontroller has been already published by me in this website. This time it is an ultrasonic range finder using arduino. HC-SR04 ultrasonic range finder module is used as the sensor here. The display consists of a three digit multiplexed seven segment display. This range finder can measure up to 200 cm and has an accuracy of 1cm. There is an option for displaying the distance in inch also. Typical applications of this range finder are parking sensors, obstacle warning system, level controllers, terrain monitoring devices etc. Lets have a look at the HC-SR04 ultrasonic module first.
Ultrasonic range finder using arduino – [Link]
Jan_Henrik @ instructables.com writes:
In this project i want to show and explain you a range sensor with ultrasonic and a 20×04 lcd screen. I wrote the code for this project myself and added lots of comments, so that everybody can understand it and use it for other projects (maybe a light range sensor?!). It is easy to build and much more easier to program, it just requires a few cheap parts and can run on battery, for a portable rangefinder.
The maximum rated range is 500 cm, the range is measured 20 times per seccond. It is Displayed on a lcd screen which is 20×4 chars big, it has a custom start message, and it can have a custom design while measuring. It will have a backlight LED and can run on every arduino, which has I²C communication. That mean you can run it on an Arduino nano, which is very small. It also requires 5V so it has to be a 5V version of an Arduino.
Arduino ultrasonic range finder – [Link]
This segment is the latest in a series of Arduino tutorials posted by Tronixstuff.
Tutorial: using Ping ultrasonic sensor with Arduino – [Link]
DIY ultrasonic range finder – [Link]
Meridith Perry, a recent graduate of the University of Pennsylvania (USA), has developed a novel method for powering electronic devices wirelessly. Christened ‘uBeam’, the method uses ultrasonic energy that is beamed from a mains-powered transmitter to a piezoelectric receiver plugged into the device to be powered.
Ms Perry came up with the idea for the uBeam system while still at university, when she forgot to take the charger for her laptop computer to a lecture and was left with a dead battery. She started thinking about ways to transmit energy wirelessly and ultimately came up with the idea of ultrasonic transmission. [via]
Novel ultrasound system provides wireless power – [Link]
The Park Ranger is an ultrasonic-ranging prototype designed to assist drivers who are backing into tight areas. The ranger uses ultrasonic pings to measure distance to the object behind and indicates this distance by sending audible tones to your FM radio. Optional panel-mount LEDs offer visual aid for calibration as well as warning drivers behind you.
The intention of this project is to demonstrate the Amani64ʼs ability to serve as a rapid-prototyping tool for applications typically covered by proprietary modules. While a commercial ultrasonic-ranging module could be used in this project, the Amani64 is used in instead to tailor the system to our exact needs. The user can drop in blocks of IP, whether open-source or their own, to create a custom application over which they have full control and ownership. A CPLD-based prototyping board is useful for any application that requires logical circuits, whether they be parallel or sequential, that space, cost, and vendor-delivery times are a concern.
DIY Park Ranger – [Link]