The Design and Development of a Heat-seeking Varying Speed Fan System
作者：張太和、張庭瑞、張晉哲、柯昱彰、黃楷淯
系級：電機工程學系 二甲
學號：D0073383、D0073663、D0073322、D0073719、D0031904
開課老師：何子儀
課程名稱：微處理機系統實習
開課系所：電機工程學系
開課學年：101 學年度 第 2 學期
AT89S52
ADC0804
CONN FLEX2
ADC0804
3
(
/
Abstract
This is primarily used AT89S52, ADC0804, CONN FLEX2
(thermistor) to detect the temperature change.
The internal resistance of the thermistor varies as the temperature
changes.
The variation of the internal resistance is convected to the digital
signal by using the ADC convecter and then fed to the microcontroller .
Then through the program to determine the temperature difference at
both ends.
If the ends of the temperature sense were the sensed temperature is
not much difference, that the temperature on both sides of the temperature
almost without heat source is heating.
If the temperature is a little big difference represents one side of the
thermistor has to feel heat, we need to find the direction of the heat source
and determines the temperature level.
The use of three kinds of lights flashing (red / yellow / green ) each
representing different temperature ranges .
The current range of high and low temperature heat source is
displayed.
When it is judged complete, the motor and the fan will start turning
toward the higher temperature side, if the same side of the thermistor
resistance moment.
Then a big difference on behalf of the heat source heating is very fast,
the fan starts after a few seconds will be staying near a heat source, to
achieve immediate cooling effect.
In addition, if the temperature is high, the fan speed will be enhanced
and sustained detect heat.
If the heat source or away from the temperature decreases, the fan
speed will be reduced, to achieve a frequency effect.
……….i
Abstract
………ii
………..iii
... 1
... 3
... 11
... 13
... 17
... 18
... 19
... 21
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2.1
(1)
AT89S52
2.2
2.3
AT89S52
(2)ADC0804
(3)
conn flex 2
(4)
(5)
(6)LED
(7)
•
8051
ADC0804
LED
•
ADC0804
0
1
8051
•
8051
•
8051
•
LED
:
2.1.2
ADC0804
A/D
/
Analog to Digital Converter
ADC
2.4
ADC0804
CS
VREF
/RD
/INTR
CLK IN
CLK R
R
C
100KHz~1460KHz
VCC
/WR
/WR
HI
LO
/WR
HI
DB0~DB7
8
AGND
DGND
VIN
+
VIN
-
VIN
-ADC0804
VREF=2.560
F
1111
15/16
15/256
4.800
0.300
E
1110
14/16
14/256
4.480
0.280
D
1101
13/16
13/256
4.160
0.260
C
1100
12/16
12/256
3.840
0.240
B
1011
11/16
11/256
3.520
0.220
A
1010
10/16
10/256
3.200
0.200
9
1001
9/16
9/256
2.880
0.180
8
1000
8/16
8/256
2.560
0.160
7
0111
7/16
7/256
2.240
0.140
6
0110
6/16
6/256
1.920
0.120
5
0101
5/16
5/256
1.600
0.100
4
0100
4/16
4/256
1.280
0.080
3
0011
3/16
3/256
0.960
0.060
2
0010
2/16
2/256
0.640
0.040
1
0001
1/16
1/256
0.320
0.020
0
0000
0
0
2.4 ADC0804
2.1.3
conn flex 2
T
-PTC Positive Temperature Coefficient
NTC
Negative Temperature Coefficient
CTR
Critical Temperature Resistance
2.1.4
(duty cycle)
2.1.5
2.1.6 LED
2.1.7
AT89S52
2.2
:
8051
1.
Sensor
2.
Sensor
LED
3.
2.2.1
1.
CONN FLEX2(
)
ADC0804
8
bit
0/1
AT89S52
2.
LED
3
(
/
/
)
:55
:20
~55
:20
3.
4.1
1.
4.2
4.2
3.
4.4
4.4
4.2
1.
LED
0
C~20
C
2.
(
)
3.
LED
20
C~50
C
4.
LED
50
C
:
5.1
:
5.2
:
word
ppt
word
word
ppt
:3
7
~3
12
:3
13
~3
19
Keil
:3
20
~3
26
00~30
:3
27
~4
2
(
BJT
)
(
BJT
)
:4
3
~4
9
:3
7
~3
12
Keil
:3
20
~3
26
00~30
:3
27
~4
2
(
BJT
)
(
BJT
)
:4
3
~4
9
,
,
,
,
,
,
,
,
,
,
,
,
,
!!
[
]
:
sensor
sensor
;
?
?
?;
8052
LAYOUT
:
ORG 0000H
AJMP MAIN
MAIN:
MOV P1,#0FFH
MOV P3,#0FFH
MOV P2,#00H
MOV R0,#00H
MOV R1,#00H
MOV R2,#00H
MOV R3,#00H
MOV R4,#20
CHANGE:
SETB P0.6
SETB P0.7
CLR P0.6
CLR P0.7
ACALL DELAY
MOV R0,P1
MOV R1,P3
CLR C
SUBB A,R1
JC LEFT
LJMP RIGHT
LEFT:
SETB P0.6
SETB P0.7
CLR P0.6
CLR P0.7
ACALL DELAY
MOV R0,P1
MOV R1,P3
MOV R2,#01001001B
MOV A,R0
CLR C
SUBB A,R2
JC LRED
MOV R2,#01101011B
MOV A,R0
CLR C
SUBB A,R2
JC MID1
AJMP LGREEN
LGREEN:
MOV R3,#20
LG:
MOV P0,#11111110B
ACALL DELAY
MOV P0,#0FFH
ACALL DELAY
CLR P2.0
SETB P2.3
ACALL DELAY
SETB P2.0
ACALL DELAY(8
)
CJNE R3,#1,SENSOR1
AJMP WAIT1
WAIT1:
CLR P2.0
SETB P2.3
ACALL DELAY
SETB P2.0
ACALL DELAY(8
)
DJNZ R4,WAIT1
AJMP MAIN
SENSOR1: SETB P0.6
SETB P0.7
CLR P0.7
ACALL DELAY
MOV A,P1
MOV R1,P3
SUBB A,R1
CLR C
SUBB A,#00010000B
JNC LT1
DJNZ R3,LG
AJMP MAIN
LT1:
MOV P2,#10011000B
ACALL DELAY
ACALL DELAY
MOV P2,#10001001B
ACALL DELAY
DJNZ R3,LG
AJMP MAIN
LRED:
MOV R3,#20
LR:
MOV P0,#11111011B
ACALL DELAY
CLR P2.0
SETB P2.3
ACALL DELAY(9
)
SETB P2.0
ACALL DELAY
CJNE R3,#1,SENSOR2
AJMP WAIT2
AJMP MAIN
DELAY: MOV R7,#50
DL2:
MOV R6,#200
DL1:
DJNZ R6,DL1
DJNZ R7,DL2
RET
END
C3 33p R21 10k U5 ADC0804 +IN 6 -IN 7 8 A G N D VREF/2 9 G N D 1 0 DB7 11 DB6 12 DB5 13 DB4 14 DB3 15 DB2 16 DB1 17 DB0 18 CLKR 19 V C C /V R E F 2 0 CLKIN 4 INTR 5 CS 1 RD 2 WR 3 U1 8051 V C C 4 0 G N D 2 0 E A 3 1 X1 19 X2 18 RST 9 P0.0/AD0 39 P0.1/AD1 38 P0.2/AD2 37 P0.3/AD3 36 P0.4/AD4 35 P0.5/AD5 34 P0.6/AD6 33 P0.7/AD7 32 P1.0 1 P1.1 2 P1.2 3 P1.3 4 P1.4 5 P1.5 6 P1.6 7 P1.7 8 P2.0/A8 21 P2.1/A9 22 P2.2/A10 23 P2.3/A11 24 P2.4/A12 25 P2.5/A13 26 P2.6/A14 27 P2.7/A15 28 P3.0/RXD 10 P3.1/TXD 11 P3.2/INT0 12 P3.3/INT1 13 P3.4/T0 14 P3.5/T1 15 P3.6/WR 16 P3.7/RD 17 C10 150p C11 150p R23 10k R1 10K C1 10u VCC VCC R29 330 D6 LED 330 R30 D7LED 330 R31 D8 LED 330 R32 D9 LED 330 R33 D10 LED 330 R34 D11 LED Y 1 12MHz VCC J4 HEADER 8 1 2 3 4 5 6 7 8 J5 HEADER 9 1 2 3 4 5 6 7 8 9 J2 CONN FLEX 2 1 2 VCC R20 10k C8 150p C9 150p U2 ADC0804 +IN 6 -IN 7 8 A G N D VREF/2 9 G N D 1 0 DB7 11 DB6 12 DB5 13 DB4 14 DB3 15 DB2 16 DB1 17 DB0 18 CLKR 19 VC C /V R E F 2 0 CLKIN 4 INTR 5 CS 1 RD 2 WR 3 R22 10k J6 HEADER 4 1 2 3 4 C2 33p J3 CONN FLEX 2 1 2 VCC
