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Contents Acknowledgments ............................................................................................................ 4 Chapter 1. Personal computer in measurements systems .................................................... 4 The parallel port ........................................................................................................... 4 The serial port............................................................................................................... 5 The sound card ............................................................................................................. 5 Planning embedded systems .......................................................................................... 6 Programming your embedded system ............................................................................ 7 Chapter 2. Measurements using the serial port of the PC ................................................. 10 Data transfer via serial port ......................................................................................... 12 Accessing output lines ................................................................................................ 18 Accessing input lines .................................................................................................. 21 Analog sensor’s signal chain ....................................................................................... 23 Temperature measurement system with LM35DZ sensor............................................. 27 Passing data to Excel 2007 application ........................................................................ 40 Pressure measurement system with a sigma-delta converter......................................... 49 Brief introduction to SQL language ............................................................................. 58 Measurement systems with I2C interface ..................................................................... 67 Expanding the serial interface using I2C ...................................................................... 88 Adding serial ports to your system .............................................................................. 93 Conclusion.................................................................................................................. 94 Chapter 3. Measurement systems using the parallel interface........................................... 95 Parallel port hardware ................................................................................................. 96 Accessing the parallel port hardware ........................................................................... 98 Reading/writing the parallel port with inpout32.dll .................................................... 100 Simple 12-bit digitizing system ................................................................................. 102 Third-party tools ....................................................................................................... 107 Writing device drivers for measurement systems ....................................................... 107 The basic device driver ............................................................................................. 113 Building the driver .................................................................................................... 120 The simple device driver for the parallel port ............................................................ 129 Light-measurement system ....................................................................................... 135 Improving the performance of the device driver ........................................................ 145 Simple thermostat system ......................................................................................... 149 1
Expanding parallel port inputs................................................................................... 159 Expanding parallel port inputs up to 16 ..................................................................... 168 8-channel analog data acquisition system .................................................................. 170 Expansion boards and converters .............................................................................. 186 Conclusion................................................................................................................ 188 Chapter 4. Sound card in measurement systems ............................................................ 189 Sound card oscilloscopes .......................................................................................... 190 Generating signals with the sound card ..................................................................... 196 Customizing the sound card output ........................................................................... 204 Expanding sound card outputs................................................................................... 206 Popular software for working with the sound card ..................................................... 209 Conclusion................................................................................................................ 211 Chapter 5. Distributed measurement systems ................................................................ 212 "Client–Server" technology....................................................................................... 217 Simple "client–server" configuration......................................................................... 219 Temperature measurement distributed system ........................................................... 237 Simple HTTP server ................................................................................................. 249 Measuring digital input signals.................................................................................. 252 Applying Internet Information Server in measurement systems ................................. 260 Configuring IIS and ASP. NET ................................................................................. 264 Conclusion................................................................................................................ 286
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