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Figure 21.32 meter s PCB.
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The backside of the digital thermo-
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to have to use an extensive mathematical formula). The table relates the resistance value read (where the time taken for the capacitor to discharge is proportional to the resistance) to an actual temperature. The table values relate back to idealized components (i.e., exact values). In the actual application, I provide a constant value that will shift the actual value returned into an accurate temperature value. This constant changes the preceding formula to Time constant R C ln(Vend/Vstart)
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Once the program starts to run, you will see that it displays a value for the current temperature or an error message uuu or ^^^ for too cold and too hot, respectively. While the circuit is up and running, you may want to fool around with it a bit, such as putting the thermistor between your ngers and watching the temperature go up or putting it into a refrigerator/freezer and watching it go down. In doing this, you will discover that the thermistor-based thermometer will seem a lot faster than a mercurybased one. That is so because the thermistor has a lot smaller thermal mass than the mercury thermometer and can reach its environment s temperature faster. As you look at the displayed temperature, you probably will notice two things. The rst is that the temperature is probably wrong. That is so because you are using components that are not perfect (ideal) their values are somewhat off the exact speci ed values. The second is that you probably will see the temperature creep up if the thermistor is close to the PIC microcontroller as the PIC microcontroller warms up from use. Both these problems can be overcome by setting the calibration constant in the PIC microcontroller. Instead of working with a constant as part of the conversion formula, I could have added a potentiometer and then calibrated the circuit by changing the RC network s total resistance. The downside to this method is that the trim parts can drift themselves either by material breakdown over time or by the circuit being knocked around.
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When the SW1 and SW2 connectors are shorted to ground, the PIC microcontroller pins to which they are connected will be pulled to ground and used to change the constant value. I put in a third-of-a-second delay to allow for debouncing and provide a delay between updating the value and disconnecting the connection to the switch. A signi cant feature of the thermo.asm application code is how the data is stored in the EEPROM. On power-up, 2 data check bytes are checked for the values 0x0AA and 0x055. These data check bytes are used to indicate that the value in the data EEPROM byte is actually correct. On the rst power-up of the PIC microcontroller with this program, these memory locations are invalid, and a separate set of code is executed to initialize the checksum bytes and the data EEPROM bytes to an idealized constant. Using the check bytes along with value byte means that if you shut off the power to the PIC microcontroller and then when you come back later, the value will still be there and usable. When I was adding the EEPROM code, I encountered the most signi cant problem in debugging the code. Every time I would run the application in hardware, only one digit would be displayed, and only the rst digit of the EEPROM data check was written by the application. This was very confusing because when I simulated the application, I found that it seemed to be running correctly, but it wouldn t when put into real hardware. After much and protracted debugging, I found that the problem was with initialization of the segment variables. I had copied one line from the previous and not changed its value to the correct variable name. This ended up costing me about 3 weeks of part-time debugging to nd the problem. The problem with the simulating that I was doing was that I had put in a Debug de ne and had jumped over a 3-second setup delay. On the system that I was working with at the time (a 50-MHz 486), this simulation took over 45 minutes to execute. When I nally gave in and allowed the simulator to run through the full 45 minutes, the problem was obvious and easily xed, the lesson being that I didn t make sure that my variable initialization was correct before I looked for other problems, and I forgot to be totally naive when looking at the problem and not expecting everything to be correct. Once I had gotten the testing applications working, I combined them into the prog32.asm application that was shipped with the rst edition. The calibration value itself is 16 bits long and is multiplied by the actual delay value. The high byte of the resulting 16-bit number is used as the corrected delay value. Using the high byte is the same as dividing the result by 256 (which is what the calibration value is based on). Doing the calculation this way eliminates the requirement to provide a division routine or oatingpoint routines as part of the calibration. This method of implementing fractions is discussed elsewhere in this book, but I want to go through it again because it relates to the problem of providing a constant fraction value to this application. For example, if you wanted to nd 30 percent of an 8-bit number, you could do this two different ways. The rst is to multiply by 3 and divide by 10. To get 30 percent of 123, the operations would be 30% of 123 (123 3)/10 369/10 36 or 37 (depending on rounding)
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