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• 触摸传感器（Touch sensors）　2008-11-11 22:34
  If you haven‘t used touch sensors in your designs， you will soon.Tom explores the new touch sensors from Cypress Semiconductor and Silicon Laboratories. Traditional keypads and touchscreens beware！ Last year， during my visit to the Sensors Expo， I concluded that touch sensing was one of the hotter topics on the show floor （"I Sense， Therefore I Am，" Circuit Cellar 207， 2007）。Over my years covering the hightech sector， I‘ve noticed that where there's smoke， there‘s either mirrors o...
  

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• 让我们清楚（Let’s Be Crystal Clear）　2008-10-30 13:28
  Many electronic devices are enhanced by crystals， but do you know why？ Robert explains why there are usually small capacitors around a crystal， the difference between "series" and "parallel" crystals， and more. Welcome to the Darker Side. I still consider myself reasonably young， but I remember when my dad bought one of the first inexpensive electronic watches. The display was made of seven-segment red LEDs， so I had to press a button to read it. Although the batteries drained after a coup...
  

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• 自我毁灭行为（Self-Destructive Behavior）　2008-10-21 19:47
  Processor Action Requires Power Supply Removal Fed up with corrosion？ Eliminate the contacts. Jeff replaced his old doorbell switch with a capacitive touch pad using only the pair of wires available at the door. If you are not in the market for a new doorbell， this solution could work well in a different project. I was frustrated for the last time. If I hadn‘t been walking by the door， I never would have known that my neighbor was standing outside patiently waiting for me to show. When I ask...
  

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• 电阻焊接(Resistance Soldering)　2008-10-11 14:39
  In his last two columns, Ed discussed transformer action and the simulated triac control of an inductive load. This month, he describes a real-world application: circuitry connected directly to an AC power line. Having investigated transformer action in my February 2008 column（"Transformers，" Circuit Cellar 211）and simulated triac control of an inductive load in April 2008 column（"Triac Behavior，" Circuit Cellar 213），now it‘s time to put everything together and match theory with reality....
  

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• 建立在游戏系统上的微处理器（MCU-Based Game System）　2008-09-28 10:34
  A Dot-Matrix Game That Targets C Coding Efficiency Andrew built a hand-held， dot-matrix video game that features scrolling scores and sound effects.You can implement an Atmel AT90S2313 and the C programming language to build a similar system. This project proves that you can use a modern CPU architecture and an efficient compiler to produce compact code without having to resort to assembly language to achieve your desired functionality. Some problems in life are easy to solve. Others， when you...
  

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• 会计情报传送译码（AIS Transmission Decoding）　2008-09-20 12:42
  Peter created a system that receives and decodes data transmissions from ships and other vessels via the Universal Automatic Identification System. Built around a Luminary Micro LM3S811 evaluation board， the decoder displays a "virtual" radar screen， showing the position of vessels in the area. As a ham radio and embedded hardware/ software engineer， I have long been interested in decoding off-air data transmissions. From an early interest in radio teletype （RTTY） transmissions，I moved on ...
  

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• 行之有效的光线追踪方法（Ray Tracing Made Simple）　2008-09-12 14:12
  A Ray Tracer Implemented On An FPGA Scott and Yunfan implemented a ray tracer on an FPGA.The ray tracer can draw spheres and planes with reflections, shadows, Lambertian lighting, patterns on planes, and antialiasing. While working on Master‘s degrees at Cornell University， we took a course called Advanced Microcontroller Design （ECE 576）。 Throughout the course， we implemented various FPGA designs on an Altera DE2 board，which contains a Cyclone II FPGA and an array of peripherals， such a...
  

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• 泵控制（Pump Control）　2008-09-05 12:24
  Build A Variable-Speed Drive For Motors Richard's single-phase, variable-speed drive for AC induction motors is an excellent device for powerful, yet quiet, pump operation. Designed for use with a capacitor-start/capacitor-run motor, it includes active power factor correction (PFC) and inrush current limiting. Over the past few years， I‘ve done various renovations to my house，including adding a new backyard deck to support a hot tub. Last year， I finally decided to buy one. I looked for a se...
  

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• 信息采集 （Message Acquisition）　2008-08-31 13:34
  Ring Signal Detection And Interpretation You'll never miss another voicemail message with Peter and Monica's voicemail monitoring system. Their device monitors the signal from an analog phone line, analyzes it, tracks the number of calls and messages, and displays the number on a VFD. In some institutions， the internal phone exchange system （aka private branch exchange， or PBX） offers voicemail，but it can‘t drive the "Message Waiting" indicator （typically a flashing light）。 In other ins...
  

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