ultrasonic tones

Analysis on the impedance of ultrasonic probes and the impedance of ultrasonic probes We know that normal people can hear the sound at a frequency of 20Hz ~ 20 KHz, ultrasound is the sound signal with a sound frequency of more than 20 KHz, avoiding audible signals that human ears can hear, so that ultrasound has a strong anti-interference ability. The simplest method is to use the network analyzer. The two

Further consideration of HC04 ultrasonic module ranging, hc04 Ultrasonic Ranging Later, I used 51 to drive this Module Multiple times. Sometimes I needed ranging and used it several times. I always felt that my last program was not very good, so I improved it this time. Although the average value is obtained for the previous measurement multiple times, the error data exists in the middle of the rule. The

Millet 5 Ultrasonic Fingerprint identification is what Ultrasonic fingerprint identification, is Qualcomm in the 2015 Mobile World Congress (MWC 2015), announced a 3D fingerprint technology. Unlike the capacitive sensors used by the Apple Touch ID and Samsung Galaxy S6, the high general is ultrasonic. Another advantage of this technique, compared with traditiona

Ultrasonic Ultrasonic (Waves): The frequency at which human ears can hear is 20hz~20khz. When the vibration frequency of sound waves is greater than 20KHz or less than 20Hz, we can not hear. Therefore, we refer to sound waves that are above 20000 Hz as "ultrasound". Because of its good directivity, penetrating ability, easy to obtain a more concentrated sound energy, in the water spread far away, can be use

Hardware Design of Four-channel Ultrasonic Flaw Detection card [Date:] Source: Electronic Technology Application Author: Meng Linggang, Song guangde [Font:Large Medium Small] 　 The overall structure of a four-channel Ultrasonic Flaw Detection cardFigure 1 shows the overall structure of the Four-channel Ultrasonic Flaw Detection card. It can b

In dental clinics, we see a lot of instruments used by dentists for diagnosing mild as well as severe dental problems. After being used for dental therapeutics and surgeries, these instruments get stained with blood, tissues and germs. That's why they require a proper cleaning procedure so, they can be disinfected and made free from the presence of GE RMS and blood stains. When it comes to selecting a specific instruments that can ensure 100% cleaning of instruments,

We know that normal people can hear the sound frequency range is 20hz~20khz, ultrasound is the sound frequency of more than 20KHz voice signal, avoid the human ear can hear the sound signal, so that the ultrasound has a strong anti-jamming ability.The easiest way to do this is to use a network analyzer, two port pairs, to give directly | The curve of the z|~f change. But the network analyzer is too expensive. Unless the big company otherwise generally can't afford, there is another way is to tak

Analysis on the impedance of ultrasonic probes We know that normal people can hear the sound at a frequency of 20Hz ~ 20 KHz, ultrasound is the sound signal with a sound frequency of more than 20 KHz, avoiding audible signals that human ears can hear, so that ultrasound has a strong anti-interference ability. The simplest method is to use the network analyzer. The two ports are displayed on one pair. | Z | ~ F. However, the network analyzer is too e

The author is from Wuhan Science and Technology of Xiao Qing classmate, next for everyone to talk about based on the high-quality ultrasound, due to the author's limited ability, so if there are errors please advice, and a lot of just engineering approximation application, has not done simulation simulation.What I'm talking about is more practice-oriented and can help you to realize this application effectively!Based on the high-precision ultrasonic,

The main principle is: the use of different surface roughness (roughness) different, resulting in ultrasonic wave of different reflection. According to Endura theory, the wave amplitude of smooth surface reflection is large and the duration is short. As the roughness increases, the amplitude decreases and lasts longer. Analyzing waveform data, you can extract many features (feature): Window length, peak, peak position, window start position, end posit

We have explained in detail the Raspberry Pi control ultrasonic module ranging (http://www.cnblogs.com/yuemo/p/8888342.html) and ultrasonic control buzzer module audible (http://www.cnblogs.com/ yuemo/p/8906111.html).Today we'll see how to apply all two modules and make an anti-theft device.First look at the connection of each pin (requires seven mother-to-female DuPont line):

Normal 0 7.8 磅 0 2 false false false MicrosoftInternetExplorer4 The basic principle of the ultrasonic transmission method for detecting the structural integrity of the pile body is: high-frequency Elastic Pulse Wave is triggered by the ultrasonic pulse emission source in the concrete, A high-precision receiving system is used to record the fluctuati

Label: des style blog HTTP color ar SP Div 2014 The ultrasonic model I used is US-020. The ultrasonic usage of the four interfaces is basically the same. I. Overview US-020 ultrasonic module ranging from 2cm ~ 7 m Power supply voltage 5 V, static power consumption less than 3mA Ii. Physical Map Size: 45mm * 20mm * 1.6mm Iii. Interfaces 1. VCC power supply, DC

I. PrefaceThe HC-SR04 ultrasonic ranging module provides 2cm-400cm non-contact distance sensing, ranging accuracy up to 3mm, and the module includes an ultrasonic transmitter, receiver and control circuitry. such as a smart car ranging and steering, or some projects, often used. Intelligent car ranging can be found in the front of the obstacles in time, so that the smart car can be turned in time to avoid o

); Gain.connect (context. Destination); Osc.start (0); gain.gain.setValueAtTime,gain.gain.setValueAtTime(0,2);With the above code, a 20000hz ultrasonic signal can be emitted within this time interval of 1-2 seconds. This calls the Setvalueattime method to change the value of the gain node, as shown in the waveform change process. The gain node has a variety of different methods that allow the signal strength to arrive at a preset value in a different

Ultrasonic principle of simple ranging accurate, the application of a wide range of the following a self-written digital tube program, display part of the need to change, the recent contest written I use the Hui Development Board, a common yin digital tube Ultrasonic Module Program//Author: Z H//time 2015/11/29//trig = p2^0//echo = p3^2 #include

Let's talk about the pins of the Ultrasonic Ranging module: VCC, echo (receiving end), tring (control end), Out (suspended), Gnd Sequence diagram: Reference code: Development Environment: freescalcodewarrior 5.0 /** Authour: flyreally** A self-written Ultrasonic Ranging module, which is made using the query method,* Of course, you can also use the interrupt.**/# Include # Include # Pragma link_info deriva

First introduce myself, I am an undergraduate student of Changchun Polytechnic University, technical or a small white, the main learned or single-chip has been hardware these things, but are not common, in view of my professional photoelectric, so I want to go the main direction or laser, now in the effort to learn laser, this blog is my first blog post , is also a freshman last semester when a similar to the assessment of works such things, and then sent out to prove that they have done somethi

Tags: echo string turn IGP HID ret nod Dev strWe use the ultrasonic module to access Arduino,Connection trig port 2, echo Access 3 port.Const intTrigpin =2;Const intEchopin =3; intcm;unsignedLongTime_ms =0;voidSetup () {Serial.begin (9600); Pinmode (Trigpin, OUTPUT); Pinmode (Echopin, INPUT);}voidLoop () {Digitalwrite (Trigpin, low);//low and high levels send a short time pulse to TrigpinDelaymicroseconds (1); Digitalwrite (Trigpin, high); Delaymicro

It is suitable for msp430g2553 MCU to use the HC-SR04 ultrasonic ranging module and communicates with PC using UART. Copy Code code as follows: #include The last time a long current_time;//was measured /*mypro*/ #define LED_1 BIT0 #define SW_2 BIT3 #define Ta1_1 BIT2//ta0.1 hc-sr04 Echo #define TRIG BIT4//hc-sr04 TRIG #define ACCU_GRD 7 Grade "xxx.x" + '//accuracy ' #define MIN_UNIT_TO1M 1000//1 m to 1 mm /*timer0*/#define SOUR