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Com ture sensor to measure the air temperature. Because of its low accuracy (± 20°C), the internal FlashTemp module isn’t suitable for the job. But, if you want to increase the precision, you can calculate and compensate for the different sound velocities at different air temperatures. 15, 2002. ———, “PSoC Designer, PGA_A Module Data Sheet,” 2002. SOURCE CY8C26443 PSoC Microcontroller Cypress MicroSystems, Inc. com Issue 150 January 2003 31 FEATURE ARTICLE Enoch Hwang Where’s the Hardware? m It would take years, even for the most voracious reader, to thumb through all of the books published on the topic of using software to build hardware.

After looking at the options for graphics devices, it looked like a small, cheap black and white televiCIRCUIT CELLAR® sion would be perfect. Not only does it meet all of the above constraints, the TV is also a good example of a hard real-time system. If the sync pulses don’t arrive on time, the image jitters or breaks up. Because the microcontroller is directly driving the TV, timing errors show up as a degraded image, giving the students rapid, understandable feedback. The Atmel AVR Mega163 has just enough memory and speed to generate a black and white video signal.

First, the device must be relatively inexpensive (there are about 75 students in my course and we need 30 to 50 sets of hardware). Second, the device must be robust so that it has a chance of surviving. Third, the device must be easy to understand so that it can be taught quickly. And fourth, the device must be standardized so that it can be easily replaced. After looking at the options for graphics devices, it looked like a small, cheap black and white televiCIRCUIT CELLAR® sion would be perfect.

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