http://letsmakerobots.com/node/13843 Reading A Sensor With Higher Accuracy – RC Timing Method RC Timing Method: Simple RC step response Vc(t) = VDD * (1 - e -t/(RC)) t = -RC ln(1 - Vth/VDD) Vth/VDD is constant : R2 = (t2/t1) * R1 A reference resistor…

No one knows exactly why some babies are born prematurely(早产), but some of the smallest premature babies weigh under 1,500 grams. These tiny babies -- called micro preemies -- can't afford to lose an ounce. At Children's National Medical Center in Wa…

很好的一道题呀 思路 状态\(d(i,j)\)表示已经经过了行程单中的\(i\)个城市,目前在城市\(j\)的最小代价,直接建边跑最短路就行了 比如机票为\(ACBD\),行程单为\(CD\),那么对于\((0,A)\),连向\((1,C)\),\((1,B)\),\((2,D)\) 有两个需要注意的地方 1.起点为\((1,行程单的起点)\) 2.城市编号很大,要离散化 以下是代码,离散化用\(map\)完成 #include <algorithm> #include <iostrea…

HamsterBear lradc按键驱动的适配 平台 - F1C200s Linux版本 - 5.17.2 ADC按键 - 4 KEY tablet 驱动程序位于主线内核: drivers/input/keyboard/sun4i-lradc-keys.c 设备树binding Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml 适配流程 开启驱动程序编译开关 进入kernel目录,执行make…

http://sourceforge.net/projects/openprogrammer/?source=navbar Open Programmer http://openprog.altervista.org/OP_eng.html#Quick Open Programmer v0.8.x Quick facts Completely free and Open Source (including firmware) Programs PIC10-12-16-18-24, dsPIC30…

http://www.design-reuse.com/articles/14886/fully-digital-implemented-delta-sigma-analog-to-digital-converter.html by Dr. Michael  Gude & Gerriet MuellerCologne Chip AG, Koeln (Cologne), Germany Abstract One of the most challenging tasks in Analog to…

Many electronic devices require user input for setting the application properties. Typical input devices include pushbuttons, potentiometers, and touchscreens. To minimize overall project cost, you may have to select low-range microcontrollers, FPGAs…

http://davidkessner.wordpress.com/2011/05/01/adc-in-an-fpga/ Geek Alert!  What follows is very technical.  It involves ADC’s, FPGA’s, and sophisticated electrical design.  If this doesn’t sound like you then you can safely skip the rest of this blog…

On April 7, 2017, residents in Dallas, Texas, woke to the sound of emergency sirens blaring all over the city. No one could shut them off, and after repeated efforts to contain the situation, the city had to shut down the entire system. While the med…

模数转换器即A/D转换器,或简称ADC,通常是指一个将模拟信号转变为数字信号的电子元件.通常的模数转换器是将一个输入电压信号转换为一个输出的数字信号.由于数字信号本身不具有实际意义,仅仅表示一个相对大小.故任何一个模数转换器都需要一个参考模拟量作为转换的标准,比较常见的参考标准为最大的可转换信号大小.而输出的数字量则表示输入信号相对于参考信号的大小. 简介 将模拟信号转换成数字信号的电路,称为模数转换器(简称a/d转换器或adc,analog to digital converter),A/D转…

layout: post tags: [STM32] comments: true 文章目录 layout: post tags: [STM32] comments: true 什么是ADC? STM32 ADC的特性 采样模式 采样时间 代码实现 什么是ADC? Analog to Digital Converter,将模拟信号转换成数字的模数转换器,后面可能还会接触到DAC,恰恰相反,是将数字信号转换成模拟信号.具体的原理可以自行找搜索引擎,可以得到更好的答案. STM32 ADC的特性 参…

摘要 本文通过列举历史中出现的产品,梳理了模数转换器在20世纪30年代~~20世纪80年代末的发展历史.接下来,简要介绍模数转换器的原理.技术指标.分类和未来发展方向.最后,提供了一种自制3位FLASH型ADC的方法(该方法经过了作者的测试且价格在20元以下). 参考文献 涉及到的数据手册(eyg7) Flash ADC_Chapter 13 - Digital-Analog Conversion    ZepToBars     <Analog-Digital Conversion> Cha…

嵌入式硬件之ADC/DAC 写在前面 这几天在做一个寒假练项目,其中涉及到了音频的处理,ADC.DAC再次进入到了我的视野,并引起了我新的思考. 1.初次相识 记得去年七月份,本科毕业刚离校,就到研究生学校这边打杂,导师让我参与了一个小项目,那个控制器电路中有一个让我印象很深的的电路--ADC采样电路. 这个电路目的很简单,就是读出P35的AD采样值,借此来估算VDD的大小,进行监测. 它的模拟信号就是电阻两端的电压,数字信号是通过P35读取到的数值,再根据相应的计算公式,就可以得出VDD的大小…

RFID读写器的工作原理 RFID的数据采集以读写器为主导,RFID读写器是一种通过无线通信,实现对标签识别和内存数据的读出和写入操作的装置. 读写器又称为阅读器或读头(Reader).查询器(Interrogator).读出装置(Reading Device). 扫描器(Scanner).通信器(Communicator).编程/编码器(Programmer)等等. 读写器工作原理 RFID读写器的基本原理是利用射频信号与空间耦合传输特性,使电子标签与阅读器的耦合元件在射频耦合通道内进行能量传…

瑞昱 8710 是一个完整且自成体系的 WiFi 网络解决方案, 能够独立运行,也可以作为从机搭载于其他主机 MCU 运行. 瑞昱 8710 在搭载应用并作为设备中唯⼀的应⽤处理器时,能够直接从外接闪存中启动. 内置的高速缓冲存储器有利于提⾼系统性能,并减少内存需求. 另外⼀种情况是,瑞昱 8710 负责无线上网接入承担 WiFi 适配器的任务时, 可以将其添加到任何基于微控制器的设计中,连接简单易行,只需通过 SPI /SDIO 接口或 I2C/UART 口即可. 瑞昱 8710 强大的片上处…

http://e2e.ti.com/blogs_/b/analogwire/archive/tags/DAC%2bEssentials DAC Essentials: A new blog series A digital-to-analog converter, or DAC, performs the opposite function of an analog-to-digital converter, or ADC. Duh, right? But, have you ever wond…

Driving proportional valves from microcontroller I am looking to drive a current regulated proportional (solenoid) valve that needs up to 85mA @ 24V from a microcontroller. So far I found this circuit that looks pretty straightforward: What are other…

This page describes the construction of an RFID reader using only an Arduino (Nano 3.0 was tested, but others may work), a hand-wound wire coil, and some assorted low cost common components. Credits The hardware and software designs for this project…

This 125 kHz RFID reader http://www.serasidis.gr/circuits/RFID_reader/125kHz_RFID_reader.htm http://www.serasidis.gr/circuits/RFID_reader/images/125kHz_RFID_reader_schem.GIF I will try to explain with simple words how the RFID works. The ATtiny13 use…

InvenSense®Technology Overview Our technology is comprised of five coreelements: our patented Nasiri-Fabrication process, our advanced MEMS motionsensor designs, our mixed-signal circuitry for sensor signal processing, ourMotionFusion™ and calibratio…

http://www.opensourceforu.com/2011/06/qemu-for-embedded-systems-development-part-1/ http://www.opensourceforu.com/2011/07/qemu-for-embedded-systems-development-part-2/ http://www.opensourceforu.com/2011/08/qemu-for-embedded-systems-development-part-3…

ADSP-BF512 :Low Power Blackfin with Consumer Devices Connectivity The ADSP-BF512 is the low cost entry point into the Blackfin Processor family. It offers an optimal balance between performance, peripheral integration, and price and is well suited fo…

https://www.quora.com/How-do-I-learn-machine-learning-1?redirected_qid=6578644   How Can I Learn X? Learning Machine Learning Learning About Computer Science Educational Resources Advice Artificial Intelligence How-to Question Learning New Things Lea…

Table of Contents Practical Process Control Proven Methods and Best Practices for Automatic PID Control I. Modern Control is Based on Process Dynamic Behavior (by Doug Cooper) 1) Fundamental Principles of Process Control Motivation and Terminology of…

when you car body with dent, which tools can fixing this problem? is there a device which with the cleanest and fastest way for fixing hail or boulders dents, door dings and other minor soft dents? WOYO PDR-007 Paintless Dent Repair is for Paintless…

基于VHDL利用PS2键盘控制的密码锁设计 附件:下载地址 中文摘要 摘 要:现代社会,人们的安全意识正在不断提升.按键密码锁由于其具有方便性.低成本等特征,还是大有用武之地的.但是通常的按键密码锁开发,都是基于单片机技术.因为单片机在性能方面存在着一些不足,还不能完全满足人们对密码锁功能和安全方面进行扩展的需求.所以,本文提出了一种相应的解决方法.本文阐述了一种基于FPGA平台和VHDL语言的密码锁设计原理与方法.密码锁作为一个小型数字系统,通过利用PS/2接口键盘作为输入模块.FPGA作为核…

BeeHive204 Very fast universal 4x 48-pindrive concurrent multiprogramming system with ISP capability BeeProg2 Very fast universal 48-pindrive Programmer with USB/LPT interface and ISP capability BeeProg2C Very fast universal 48-pindrive Programmer wi…

http://www.powerguru.org/changing-the-output-voltage-of-a-switching-regulator-on-the-fly/ There are many different ways to change the output voltage Applications that require the output voltage of a power supply to change dynamically come from a wide…

http://en.wikipedia.org/wiki/System_console System console Knoppix system console showing the boot process The system console, computer console, root console, operator's console, or simply console is the text entry and display device for system admin…

http://en.wikipedia.org/wiki/ARM_architecture ARM architecture     ARM architectures The ARM logo Designer ARM Holdings Bits 32-bit or 64-bit Introduced 1985 Design RISC Type Register-Register Branching Condition code Open Proprietary 64/32-bit archi…