介绍了当前普通标记机控制系统现状及其存在缺点，给出气动标记机及相频修正PWM模式的工作原理。采用ATmega16单片机和USB转换RS232接口器件CH341T实现驱动控制系统与PC的实时通讯，标记控制系统可升级到USB接口。采用基于ATmega16的相频修正PWM替换555振荡电路产生的PWM，可直接通过软件调整PWM信号。使用达林顿三极管TIP122替代直流继电器驱动高频电磁阀，使得电磁阀驱动电路简单，成本低廉。该控制系统已成功应用于气动标记机。 Abstract: In this paper,the actuality and demerit of the common gas marking machine control systems are described.The operation principle of the gas marking machine and the phase and frequency correct PWM of ATmega16is introduced.The real-time communication between the driving control system and PC by CH341T which its function is translated USB to RS232is realized,the control systems is updated grade to USB interface.The PWM signal can be adjustable by software for the555surge circuit was substituted by the phase and frequency.The high frequency electromagnetic value’s driving circuit by DC relay is replaced by TIP122,therefore,the circuit is become simple and the cost cheap.The control systems has been widely used in gas marking machine.
上传时间： 2013-10-18
上传用户：1427796291
介绍一种简单射频识别系统设计。该设计包括阅读器、应答器和线圈3部分。由单片机控制阅读器向应答器发射无线信号，并接收应答器回送的信号，再通过分析回送信号识别物品。阅读器和应答器之间以半双工通信方式通信。 Abstract: A simple design of radio frequency identification system is given in this paper.The design includes reader,responder and winding.Through MCU，signals are sent to responder from reader，then corresponding signals are sent back. According to the analysis of the signals sent back，the objects can be identified.Half-duplex communication is adopted? between? reader? and? responder.
上传时间： 2013-10-11
上传用户：plsee
介绍一种以MSP430单片机为基础的智能频率测量系统，采用硬件逻辑与软件指令相结合的方式控制闸门，实现0 MHz~10 MHz范围内无档切换的等精度测量。 Abstract: An intelligent frequency measurement system based on MSP430 singlechip is introduced. The system uses a way that can combine hardware logic and software instructions to contronl the strobe ,and completes the functions of equal precision in the range of 0MHz~10MHz without shifting
上传时间： 2013-10-28
上传用户：dbs012280
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上传时间： 2013-11-17
上传用户：vodssv
This application report discusses the design of non-invasive optical plethysmographyalso called as pulsoximeter using the MSP430FG437 Microcontroller (MCU). Thepulsoximeter consists of a peripheral probe combined with the MCU displaying theoxygen saturation and pulse rate on a LCD glass. The same sensor is used for bothheart-rate detection and pulsoximetering in this application. The probe is placed on aperipheral point of the body such as a finger tip, ear lobe or the nose. The probeincludes two light emitting diodes (LEDs), one in the visible red spectrum (660nm) andthe other in the infrared spectrum (940nm). The percentage of oxygen in the body isworked by measuring the intensity from each frequency of light after it transmitsthrough the body and then calculating the ratio between these two intensities.
标签： Pulsoximeter Single-Chip Des
上传时间： 2013-10-27
上传用户：黑漆漆
用户程序示例教程 The Blinky project is a simple program for the LPC2138using Keil MCB2130 Microcontroller Board. It blinks the LEDs at speed according to the Potentiometer setting and prints the current seting to the Serial Port 1.In addition it generates a sine wave with an adjustable frequency on the speaker of the board.
上传时间： 2014-12-27
上传用户：hongmo
The XL6003 regulator is fixed frequency PWM Boost (step-up) DC/DC converter, capable ofdriving 1050mA load current with excellent line and load regulation. The regulator is simple to use because it includes internal frequency compensation and a fixed-frequency oscillator so that it requires a minimum number of external components to work. The XL6003 could directly drive 5~10 3W LED units at VIN=12V.
上传时间： 2013-11-07
上传用户：xy@1314
The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc.
上传时间： 2013-10-10
上传用户：inwins
PCA9511, PCA9512, PCA9513, PCA9514, PCA9515, PCA9516, PCA9518,P82B96, P82B715Abstract - Philips Semiconductors family of Repeaters, Hubs and Expanders are detailed in this application notethat discusses device operation, maximum cable length and frequency calculations and typical applications.
上传时间： 2013-11-21
上传用户：wlcaption
Microchip ZigBee协议栈:ZigBee™ 是专为低速率传感器和控制网络设计的无线网络协议。有许多应用可从ZigBee 协议受益，其中可能的一些应用有：建筑自动化网络、住宅安防系统、工业控制网络、远程抄表以及PC 外设。与其他无线协议相比， ZigBee 无线协议提供了低复杂性、缩减的资源要求，最重要的是它提供了一组标准的规范。它还提供了三个工作频带，以及一些网络配置和可选的安全功能。如果您正在寻求现有的控制网络技术（例如RS-422、RS-485）或专有无线协议的替代方案， ZigBee 协议可能是您所需的解决方案。此应用笔记旨在帮助您在应用中采用ZigBee 协议。 可以使用在应用笔记中提供的Microchip ZigBee 协议栈快速地构建应用。为了说明该协议栈的用法，本文包含了两个有效的演示应用程序。可将这两个演示程序作为参考或者根据您的需求经过简单修改来采用它们。此应用笔记中提供的协议栈函数库实现了一个与物理层无关的应用程序接口。 因此，无需做重大修改就可以轻松地在射频（Radio Frequency，RF）收发器之间移植应用程序。在此文档末尾的“常见问题解答”中提供了有关Microchip 协议栈和用法的一些常见问题及其答案。
上传时间： 2013-10-08
上传用户：u789u789u789
