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This code only improves the original by two addresses, but it sure is a lot easier to understand. This is IRLCD_4.asm in the IRBetter folder. When I implemented this change, I cheated a bit and changed the CRC tap (and not the line coming in, which would have meant that I would have to change the LCD code). But it still ran very well, with unique CRCs generated for each of the keys of the Sony-mimicking universal remote. I guess the moral of this whole escapade is that tremendous improvements in your code (in terms of size and effort requirements) can be made if you look at a problem from a different angle. The code literally took less than 6 hours to develop and debug (compared with over 2 weeks for the original IR receiver code of the robot). The code takes up about a third of the space of the IR read algorithm used in the robot and uses only two 8-bit variables compared with the seven of the robot s code. This is a tremendous improvement! Discussing this philosophically, it can be seen that this experiment actually restructures the application (reading an IR transmitter) to best t the PIC microcontroller. The data read is now totally 8-bit, as opposed to the 12/16 bits that had to be handled in the original application.
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Thermo: ELECTRONIC THERMOMETER WITH SEVEN SEGMENT LED DISPLAYS
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One of the most popular PIC microcontroller projects I have ever created is this electronic thermometer. The basic model shown here has served me well for a number of years (Fig. 21.29), and I have even replicated it in 123 PIC Microcontroller Experiments for the Evil Genius to demonstrate how the application could be implemented using HT Soft s PICC Lite. The application itself uses the resistor/capacitor network discussed elsewhere in this book for determining the resistance value of a thermistor. The temperature output is displayed on three seven-segment LEDs. The circuit is driven by a PIC16F84 using a 1-MHz crystal. There are a number of possible areas for inaccuracies in this circuit, so I have included the ability to set a calibration value, which is stored in the PIC16F84 s data EEPROM, which is used to allow the temperature range to be set accurately. The thermistor that I used was bought from Radio Shack, and while the part is widely available in North America, it cannot be ordered under the Radio Shack brand name elsewhere in the world. I have described the operation of the thermistor so that you can nd the equivalent part numbers in your own location. One comment/caveat for readers who want to use this project as a basis for other applications: This is not a precision instrument. Despite inclusion of the capability of calibrating the output temperature, you should not assume that this thermometer can be used for precision operations. I am putting in this warning because I know of at least two people who have used this circuit to control the temperature in their barns. While
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PROJECTS
The completed digital thermometer.
I have not heard any negative feedback regarding the circuit s operation or accuracy, I should point out that if you are looking for accurate temperature readings, use the DS1820 digital thermometer, which has an interface application presented later in this chapter. In terms of actual applications, this circuit apparently has been used as the basis for a thermostat in a chicken-hatching incubator without any ill-effects to the chicks. I suspect that this circuit is reasonably good around a small set range, although I would be very wary of the accuracy of results returned over a wide temperature range. The code displays the current temperature in degrees Celsius. The thermistor was bought from Radio Shack (Part Number 271-110). This part is a 10-k thermistor with a negative temperature coef cient (NTC) of 3.85 percent. This means that for each degree Celsius the thermistor is raised, the resistance within the thermistor drops by 3.85 percent. The base temperature is 25 C, and the thermistor s response to different temperatures is listed in Table 21.12. To create the thermometer, I created the circuit shown in Fig. 21.30. My prototype was built on a phenolic prototyping board that was bought as part of a prototype box. The bill of materials for this project is listed in Table 21.13. The seven-segment LED displays used are of a common cathode type (which is to say the cathodes of all the LEDs within the display are connected to common pins) that takes up a 14-pin 0.300-in DIP pattern. The pinout of the conventional seven-segment LED displays is shown in Fig. 21.31. When I rst created this application, I couldn t nd the standard reference to the display, so I came up with my own standard (which is almost right). In Fig. 21.31 I have included a table to allow you to convert between my number convention and the universal letter convention. DP is for the display s decimal point.
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