60 results about "MAX232" patented technology

The invention discloses an intelligent wheelchair voice drive controller and an identification and control method. The controller includes an audio circuit module, a voice processing circuit module, a MAX232 communication module, a DSP processor, a joystick circuit module, a speed regulation circuit module, Power supply circuit module, motor drive circuit module, fault detection circuit module, voltage and current detection circuit module, brake circuit module. Speech recognition adopts a specific human speech recognition method based on fuzzy support vector machine, which improves the recognition rate and enhances the anti-noise ability. The DSP processor controls the coordinated operation of the motor by outputting PWM waves. The invention proposes a master-slave intelligent wheelchair voice drive control scheme with a single-chip microcomputer as a voice information processor and a DSP as a drive controller. The advantage of the present invention is that it can be controlled manually or automatically by voice, and it is convenient to use.

The invention provides a switchgear partial discharge detecting system based on an ultrasonic signal. The switchgear partial discharge detecting system comprises the components of a power supply module, a sensor module, a signal processing module, an AD conversion module, a single-chip microcomputer module, a communication module and an upper computer. The sensor module comprises an ultrasonic sensor and a preamplifier circuit and is used for acquiring an ultrasonic signal in an air medium. The signal processing module comprises an impedance matching circuit, a main amplifier circuit and an optoelectric coupler. The signal processing module realizes filtering, amplification and detection on the ultrasonic signal. The single-chip microcomputer module performs calculation on data and transmits the calculated data through a serial-port module. An MAX232 chip is utilized in the communication module. Ultrasonic data are finally transmitted to the upper computer by a communication circuit through a serial-port-to-USB line. The upper computer receives the signal which is transmitted from the single-chip microcomputer and performs empirical mode decomposition (EMD), thereby obtaining an intrinsic mode function. Then Hilbert transform is performed. A partial discharge signal is detected through analyzing a Hilbert spectrum.

The invention discloses an intelligent well underground data collecting system based on a high-temperature single-chip microcomputer. The intelligent well underground data collecting system is composed of an underground part and a ground part which are connected through a single-core steel armor cable. The underground part is composed of a sensor set and a data processing and transmitting circuit. The ground part is composed of a data receiver uploading circuit and a system host. 220V alternating current is remotely transmitted to the underground part to be supplied from the ground through the cable. The sensor set comprises a temperature sensor, a pressure sensor and a displacement sensor. Signals of the sensor set are converted into voltage signals after being conditioned, a simulation multiplexer HT506 is utilized for carrying out selective collection, the signals are converted through an A / D converter HT574 and then are transmitted to a microprocessor HT83C51, an HJ389 high-temperature pulse composite signal lone-line driver is adopted as a drive circuit to transmit the signals to the cable, an HJ388 pulse signal preprocessing module in the data receiver uploading circuit carries out signal conditioning on the transmitted underground signals, and the processed signals are transmitted to the microprocessor single-chip microcomputer and then transmitted to the host through an interface circuit MAX232. The pressure, the temperature and the valve displacement are monitored in real time, and long-term stable working under the high temperature environment of 175 DEG C can be achieved.

The invention relates to a ship-swaying dip angle measuring instrument. The ship-swaying dip angle measuring instrument comprises a microcontroller, a measuring circuit, a displaying circuit and a communication circuit, wherein the measuring circuit, the displaying circuit and the communication circuit are connected onto the microcontroller. The model of the microcontroller is ATMEGA48, the displaying circuit is a nixie tube dynamic display module, PC0-PC5 ports of the microcontroller are connected to the input end of the nixie tube dynamic display module respectively, and PD0-PD5 ports of the microcontroller drive three selection ports of the nixie tube dynamic display module respectively. The measuring circuit comprises a triaxial accelerometer chip, wherein the triaxial accelerometer chip is connected with the microcontroller through a single program initiation (SPI) bus, and the communication circuit adopts an MAX232 serial communication chip. The ship-swaying dip angle measuring instrument can measure transverse swing and longitudinal swing simultaneously, is high in measurement accuracy and can perform remote operation to measurement data.

The invention relates to an indicating and controlling device for an intelligent accessing system of a pharmacy. A database server is accessed to a hospital information system; a hot-standby server and a terminal control PC (personal computer) are connected to a database server respectively; the terminal control PC is in communication connection with a singlechip through an MAX232 serial communication chip; the singlechip is connected with a 8-bit serial shift register; indicating equipment is connected to the 8-bit serial shift register; the hospital information system sends recipe information of a patient to the database server; the database server stores the recipe information and sends the recipe information to each terminal control PC; the terminal control PC transforms the recipe information and sends the recipe information to the singlechip through the MAX232 serial communication chip according to a communication format; and the singlechip performs data transformation and transmits the data to the 8-bit serial shift register in a serial communication way; and the indicating equipment is controlled to indicate positions of medicines. The indicating and controlling device for the intelligent accessing system of the pharmacy is low in cost, and can indicate the storage positions of the medicines quickly, accurately and clearly, so that the medicine taking speed and the medicine taking accurate rate of a pharmacist can be improved.

The invention provides a black box system used in an electronic circuit experiment. The system comprises a PC upper computer, a main control computer, a black box and operation software containing a black box database. The main control computer is a control system that takes a singlechip as a core and is composed of the singlechip, a radio frequency card reader, an MAX232 convertor and a mini-printer. The black box is internally encapsulated with a tested circuit module and a radio frequency card chip. The card reader in the main control computer reads the card number information of a radio frequency card built in the black box, the database of the black box is built in the PC upper computer, and the main control computer and the PC upper computer compare the card number information with the database through a communication link, thus obtaining the parameters built in the black box. In order to further promote the teaching reform of experimental courses, the invention provides an electronic circuit experiment and examination black box system to be used for 'circuit fundamental' and 'simulation circuit' course experiment and examination, thus creating a new path of experiment and examination.

The optical cable line blocking information sensor belongs to the electronic, communication and automation control technology and the computer science field, and particularly relates to an optical cable line blocking information sensor. The invention provides an optical cable line blocking information sensor which does not affect normal operation of an optical fiber communication transmission network and can effectively monitor the optical cable line blocking information. The optical cable line blocking information sensor comprises a grasping type optical signal collector and a comprehensive control circuit; the optical cable line blocking information sensor is characterized in that a signal input end of a comprehensive control circuit is connected to a signal output end of a grasping type optical signal collector; the comprehensive control circuit comprises an NPN triode Q1, a PIC16F690 chip U1, an MAX485 chip U3 and an MAX232 chip U2; a base electrode of a Q1 is connected to a signal input end of the comprehensive control circuit through a resistor R8; a collector electrode of the Q1 is connected to a power supply VCC; an emission electrode of the Q1 is connected to one end of an resistor R9 and one end of a resistor R 16; and the other end of the R9 is connected to the ground.

The invention discloses a solar charging device for a portable computer. The system comprises a computer center and remote control equipment, the output end of the computer center is connected with anetwork management server; the network management server is also provided with a communication interface; The output end of the network management server is connected with the database and the application server. the output end of the network management server is also connected with remote control equipment; The output end of the remote control device is further connected with a man-machine interaction device. an embedded control system is further mounted in the remote control equipment; the output end of the embedded control system is connected with the high-speed scanning generator through the double-port RAM module; The output end of the high-speed scanning generator is connected with an MAX232 controller, and the input end of the embedded control system is connected with a modem through a two-way port, so that a user can conveniently complete the functions of eliminating computer faults, maintaining a server, transmitting files, working at different places and the like.