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TABLE 21.12 RESISTANCE VERSUS TEMPERATURE FOR THE RADIO SHACK THERMISTOR TEMPERATURE ACTUAL RESISTANCE
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20 C 21 C 22 C 23 C 24 C 25 C 26 C 27 C 28 C 29 C 30 C
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To drive the LEDs, I control the connection through the common cathode to ground using a 2N7000 N-channel MOSFET. Each segment is toggled through one vehundredth of a second to display the three-digit temperature on the display. In the schematic, I show (and for my prototype I used) a 9-V alkaline radio battery. Instead of a 9-V battery, an ac/dc wall adapter can be used for the circuit. When you
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Vcc Vcc
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U1 PIC16F84 14 V dd
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Vcc Vcc
C2 0.1 uF
Y1 4 MHz
RA2 RA3 RA4 RB0 RB1 RB2 RB3
1 2 3 6 7 8 9
OSC1 RB4 10 RB5 11 RB6 12 RA0 17 RA1 18
R2-R9 220 14 1 13 2 6 7 8 9
LED1-LED3
+ C5 0.1uF
R1 10 K
OSC2 C3/C4 30 pF 4 _MCLR
13 RB7
Q1 - Q3 4 12 4 12 4 12 2N7000 Q1 Q2 Q3 Q3 shows TO-92 Vcc Vcc Orientation
R11 Thermistor
R 12 10 K SW1
R 13 10 K SW2
R10-100
Vss 5
SW1/SW2 Set Internal Calibration
The digital thermometer schematic.
PROJECTS
TABLE 21.13
DIGITAL THERMOMETER BILL OF MATERIALS DESCRIPTION
REFERENCE DESIGNATOR
U1 U2 Y1 C1 C2, C5 C3, C4 R1, R12, R13 R2 R9 R10 R11 Q1 Q3 LED1 LED3 J1 SW1, SW2 Misc.
PIC16F84 04/P 78L05 1.00-MHz crystal 10- F electrolytic 0.1- F tantalum 30 pF 10 k 220 100 , 1/4 Wt , 1/4 W , 1/4 W
10 k , 3.85% NTC thermistor (Radio Shack Part Number 271-110) 2N7000 N-channel MOSFET in TO-92 package 7-segment common cathode LED displays 9-V battery connector 2 1 0.100-in pin headers
Prototype PCB, experimenter s box, wire
Note: The following Table Converts Segment Numbers to Conventional Letters:
5 7 5
6 1 7 4 3 DP 2
6 1 Cathode
Cathode
Number 1 2 3 4 5 6 7
Letter B C D E F A G
DP 2
Figure 21.31 cathode LED.
Pinout for a seven-segment common-
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look at my circuit, notice that I included an SPST switch for turning on and off power to the circuit. Each LED segment is connected to a PIC pin via a 220- resistor, except for the segment connected to RA4, in which the 220- resistor is attached to Vdd, and the PIC pin pulls it low to turn off the LED. This is to avoid the issue of RA4 not being able to drive positive signals and ensures that there is no possibility for high currents to be sunk by RA4. This was done to avoid both the PIC microcontroller being burned out and to minimize current consumption when RA4 is pulling the line low. In my application, I wired the segments as RA2 is connected to segment 6. RA3 is connected to segment 5. RA4 is connected to segment 1. Note the comments above. RB0 is connected to segment 7. RB1 is connected to segment 4. RB2 is connected to segment 3. RB3 is connected to segment 2. The decimal point (DP) pin of the LED display was left unconnected. The reason for using these values was strictly to make the wiring easier. If you look at Figure 21.29, you ll see that the seven current-limiting resistors are placed between the PIC and the LED displays. The seven-segment LED display connections use the seven I/O pins on the left side of the PIC microcontroller. When creating an application such as this, you really have to plan ahead. In this application, the best example of this is wiring the seven left-side PIC microcontroller I/O pins directly to the current-limiting resistors and then to the seven-segment LED displays to avoid having to come up with very complex wiring. To help simplify the wiring even further, I also put the switching transistors along the bottom of the sevensegment LED displays to allow a common ground to be run to each one. Even with this planning, I still had to move around a couple of components and wire them on the backside of the board to get everything to work together. The nal mess of wires is shown in Fig. 21.32. A useful strategy to use in the application development process is to make sure that each subsystem in the application is tested before the nal application is created. The source code for the Thermo application (thermo.asm) can be found in the code\Thermo folder. The program uses the following formula Time R C ln(Vend/Vstart)
to measure the resistance of the thermistor. To initially calculate the actual temperature, I used idealized components and had the temperature looked up from a table (because the thermistor resistance versus temperature is a nonlinear function, and I didn t want
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