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In this paper is presented a solution for long-term power supply optimization implemented in a system for detection, monitoring and recognition of ground vibrations resulting from human activity to protect critical infrastructure. These systems must use besides conventional energy sources the backup energy sources to offer over to 300 days autonomy without maintenance. This autonomy can be obtained...
This paper presents a versatile implementation of a reconfigurable module for acquisition and synthesis of modulated signals that are specific to the modern communication equipments. The hardware structure of the system is elaborated mainly around the TDA 8702 high speed video digital-to-analog converter and ADC 0820 analog-to-digital converter, both connected in a configuration that is controlled...
This paper presents an enhanced conditioning and transmission unit aimed for interfacing resistive bridge sensors with remote data acquisition and control systems. The proposed module uses a simple but reliable communication technique based on a combination between frequency and pulse width modulations. This design, based on two transmission methods, ensures the multiplexing on a single carrier of...
The paper proposes a solution for measuring the current consumption on the transmission lines for detecting the losses that may occur. The solution is non-invasive: the sensors determine the current by analyzing the electric field around the isolated conductor, it is fully mobile and easy to install: sensors are “clamp” type and can be placed on insulated conductors, data is transmitted wirelessly...
In this paper are presented the results regarding the simulation and the implementation of an enhanced communication interface based on pulse position modulation technique. The proposed module is aimed for integration in the conditioning circuits of the sensors that are connected to data acquisition systems which require transmission of information signals over short to moderate distances. Because...
In this paper is presented a new approach for implementing a versatile temperature control and monitoring system for thermal enclosures based on Peltier thermoelectric elements. The system is intended to be used for temperature testing of equipped or unequipped electronic printed circuit boards (PCB). These types of tests regarding thermal aging and endurance are very important for verifying the long...
This paper presents an acquisition system for sound recording, typical spectral component identification and extraction of particular instruments from a soundtrack, based on each instrument's spectral components. This system is also capable of sound reproduction (playback) and its main feature consists of minimizing the delay between the recorded sound and the playback sound below 100ms. To achieve...
In this paper are presented the results regarding the implementation of a communication interface dedicated for conditioning and remote transmission of measurement signals acquired from sound and vibration sensors. The interface contains two parts, an analog section, responsible with long distance signal transmission and a digital section that realize demodulation and analog-to-digital conversion...
This paper approaches the problem of implementing an experimental module that facilitates the teaching and learning of the Braille alphabet. The proposed system follows to improve the existing assistive technologies dedicated for helping visually impaired peoples. The main board of the experimental module is realized around the PIC 16F877A microcontroller that runs a proprietary software application...
This paper presents an application for remote control of a mobile robot with XBEE wireless communication. The control of the mobile robot is realized by a PC within a software interface or by using a user mobile remote control. The application is implemented in LabVIEW and can be used for robot control and robot movement tracking.
This article presents the implementation of a novel architecture of a specialized measurement and control system that is intended to be integrated in a complex automation system for buildings. The proposed design is realized around Atmega 328 microcontroller embedded on Arduino Uno development board. For indoor environmental monitoring are used different sensors associated with various physical quantities...
In this paper are presented the results regarding the design and the implementation of a efficient delta encoder that is intended to be used for conditioning of signals from analogue sensors. In addition is proposed a dedicate circuit architecture for transmission of digitally encoded signals from sensors to remote measurement systems using a very reliable communication media that is represented by...
In this paper are presented the results regarding the implementation and testing of a novel type of remote control based on the data transmission facilities offered by the GSM network infrastructure and the processing power achieved by new generation of microcontrollers. The system is intended to be used in the development of complex distributed control applications that are specific to various automated...
This article presents a “smart sound sensor” solution. More specifically it is a system on a chip capable of extracting sound patterns from an input signal captured by a microphone, patterns that correspond to certain musical instruments. The aim is to identify sounds like: voices, ambient sounds or musical sounds. Such applications generally involve the presence of a computer that analyzes offline...
In this article is presented the implementation of a new type of reconfigurable signal generator and simulator used for testing digital transmission circuits that requires complex modulated waveforms. In our experiments we choose as an example the quadrature amplitude modulation or quadrature phase shift keying (QAM/QPSK) signals. The proposed solution is based on a high-speed NI-USB-6251Mdata acquisition...
This paper presents an application used in educational laboratory for multiple waveform measurement and display, for analysing of the operation of electronically circuits. It was implemented as virtual instrument in LabVIEW and uses a data acquisition card for electrical signals acquisition. The application can be used in educational laboratory for multiple signals measurement, record and time correlated...
This paper presents an application for generating of all the signals in case of digital televisions corresponding to standard colour bar patterns, from primary RGB signals to YCbCr colour space digital signals. It was implemented in LabVIEW and can represents D1 and D2 format for DTV signals on 8 and 10 bits resolution. The application can be used for DTV signals teaching and analysing in case of...
This paper presents a solution to diagnosis printed circuit boards in terms of wiring crossing, based on real-time image analysis. The image is captured using an ordinary video camera (web cam) that is placed above the board while a light source is placed under. The image is processed locally in the FPGA, and bright spots which indicate board cross are isolated. Through an Ethernet interface, the...
This paper presents a system of “image sensor” for recognition and counting of shapes present in an image. Result information is provided as identified object, position relative to the lower left corner of the image and the number of objects detected in a certain type of image. In other words, the system functions as a sensor, the image is the entry and the items extracted from it represent the output...
The Internet of Things era is making hardware projects more accessible than ever to hobby and beginner users. As many of them work on their projects from home, there is a growing need for accessible tools, or even tools that they can build themselves for later user in other hardware projects. The main purpose of this paper is to present an open source solution for a portable oscilloscope, customized...
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