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本帖最后由 hi_yjs 于 2013-1-25 21:14 编辑
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: c6 w4 p6 A2 s f* r最近用热敏电阻做个温度计。2 C& e5 ?' D# O3 P3 l
大家都知道,热敏电阻阻值随温度是非线性变化的,而且规格书也只是跳跃地给出部分对应值。
1 n0 }* Y5 A! c4 ]; Y: v# {请问该如何写出较高精度的程序呢?/ Q4 ~" t2 {8 D& p# n' m9 G
(查表吗?那样表格会很庞大吧?而且取值也不好计算吧?)0 L2 ?6 b* p, [% y) ?8 }
" N3 p7 \3 R/ S& r$ w3 E
付热敏电阻部分对应阻值表:. s" C2 I8 D) L5 e1 J. q# d
LT804;BValue25/50=4020;R25=100K) T4 I, w! q7 b3 `
温度 电阻值
5 O) y9 L |6 [; }& v" t6 e-50 7291.38: d& I4 K* f" q2 Z+ v
-49 6774.88
1 v! y1 G% @$ G-48 6298.61, F- j( b' Z0 U- L$ S
-47 5859.17
3 t' ^5 p- b/ j2 n4 [( F-46 5453.45* n/ `6 \+ u8 F0 Z/ ]9 i& F
-45 5078.66
6 D& N2 c) \+ Z; i-44 4732.22* y* E& y: J- c/ m- ?1 o( l
-43 4411.8- o- _: u% L, s) {4 N
-42 4115.287 V9 r5 t% y% ^% W' y
-41 3840.72
, Z, A& A) o& l- V-40 3586.35/ j* x# W" _4 t' H, Q. A# u- m
-39 3350.55
7 }) ]% B$ Y7 o7 @& e; Q-38 3131.85( e- T& G: z+ w3 L& ~& G
-37 2928.9
( j- u/ {' j; E* i1 n' H7 ^-36 2740.46
- x$ z/ O/ W. O-35 2565.4* m# k; Y' k) `1 {1 j
-34 2402.69
* D2 J* V' B _-33 2251.37
7 g2 h3 t3 c2 {( y9 Q-32 2110.58
- N. y3 T- b2 T; h; ]' r-31 1979.52" q8 A: ~3 |0 ]! O" C: K1 V# B
-30 1857.46
/ o; x3 _8 o$ F-29 1743.72
5 w7 d- S7 v8 L. K6 N- h+ q& W-28 1637.683 U' j. h$ g5 e' C' j
-27 1538.77
6 L1 N* F7 g) }' G- Y7 ?-26 1446.47, ~5 S' p, ^6 Z1 P
-25 1360.32 t4 h% V% T6 q; q5 Y
-24 1279.82+ {0 U* S9 r% V( I
-23 1204.616 X4 H' v2 p F! e# J$ Y% T" h5 D
-22 1134.29* g) l5 Y ?) h# t, c
-21 1068.52$ \ X6 j1 m- N( ~
-20 1006.98) K$ d. h0 z" l D
-19 949.368% j0 p$ H4 p0 w0 T
-18 895.411" j0 m4 r2 ~: O* l/ N5 |
-17 844.8560 z' z% q( a8 T1 L
-16 797.4675 q5 u) b" D) C% \3 } m, u; z9 x
-15 753.028
# b% l8 c9 G( c- f O-14 711.338
6 m! W$ ~/ ]! }% Z' N! u+ `-13 672.2113 P/ ?" q+ d9 J5 k
-12 635.474
2 X' M9 d! `- p-11 600.967
8 s% ]8 ^) V# q; T-10 568.543
( E5 W% L8 ?9 V1 f3 R-9 538.063! r% o/ }: e5 I) M3 `6 s
-8 509.4
C" @# H$ _# V; _-7 482.435
9 Y G% q0 L) S) z1 d-6 457.057
- y4 z; t& a6 x) F6 d, b- X4 ?-5 433.165
% O; ^$ N$ l+ R, z3 W! X, Y-4 410.663
% W; F; N/ X; A" T2 |-3 389.4623 S1 D* N. \$ j- }% E" x+ y4 r
-2 369.479
, `7 }. L8 Y" I7 h2 c-1 350.639! l# p/ h: s2 A, C
0 332.868
2 c7 e1 \4 ^% L0 |" N1 316.102) E& H( a/ Q9 j. J; h- I/ x
2 300.2765 ?/ a) z7 E9 b' y7 O
3 285.3347 b+ C7 B! S3 O( ]" S) }
4 271.221' j2 b; S, b4 r: M3 Z
5 257.886. A L' e- i0 u
6 245.283* c/ Z+ H; j7 G: X7 Y9 ^- b
7 233.367! I. g9 l) T- [. |3 }
8 222.098
) j! M0 K/ }! m0 P' B" {8 R; E: M9 211.435
+ @+ W) N; U2 \5 ]3 N1 n! t u10 201.3453 Z# i2 i N& X* @0 P* U
11 191.792* T7 I; b' X& U
12 182.746
, m9 }' V( X; b1 W9 X13 174.176
4 U( R4 D2 V6 |: f14 166.056
# B: q3 u: u1 T" z% R15 158.359
3 m& h0 l: G0 o16 151.06
! \( i4 K5 z) M3 d& U: u5 s7 H0 R17 144.138
. d( [, P2 U' Q! H) H18 137.571
. H* v* }' ~& K. j0 q19 131.339
4 K1 Q7 ~# P! H0 T20 125.423
1 A! R7 [$ n) t2 f0 }* d* S: y1 |21 119.805
: L5 P1 X/ ?+ I3 y( X22 114.469
8 y% v1 I6 J s. F; I23 109.3999 s4 H, g! V5 f
24 104.5811 {8 R0 b4 Z0 v' Z+ A( B
25 1007 A9 d/ t: `: P h) K" q5 d6 _
26 95.6443
~* v& d! c, e( k9 R27 91.5013
+ Z- h& C. ^' }# x/ N1 |28 87.55968 N8 f5 n# X, G# R+ l g( |; X
29 83.8083) g( {0 h2 E6 ~" I' o6 B4 F
30 80.2372
) K1 u, X# A5 i$ ?8 V# }31 76.837
" @ ~6 {: N- l2 v u/ Z$ {2 O32 73.5984
) w! C6 v0 {# K- Y1 Q2 r) ~ ~ W5 r33 70.5131/ I( ~, j B D
34 67.573* N6 y8 t7 `0 Z: [
35 64.7706# m1 {1 N# k# @9 I0 D8 q( m
36 62.0987
: h/ C! P4 i& Y+ u( q: A; ~37 59.5507
; i H2 b, z" S" }! w" h38 57.12020 w! w5 \: d+ G7 v5 ?3 Q( E
39 54.8011
& ?4 L6 Z3 ?. [6 ~; R: z& O* p! `40 52.588
2 [+ I7 L+ ?! {$ A41 50.47536 E" b G" N# Q, Y& T; c5 z0 X- G
42 48.4581
; ]( j7 O/ R7 A' t43 46.5316! E0 R, r/ J3 [' H+ j
44 44.69137 I" ]6 V) J( A3 x! ^
45 42.933
+ s* D" _5 M2 q3 T- m3 z; y46 41.2525
/ O( B6 b) z" R47 47.3965
. R/ v2 M; a5 ?; D) O b6 V6 M48 38.114 `3 B0 M: F2 o. m3 D8 k
49 36.6411
0 R# n8 o+ l8 J8 X K# ?50 35.236
% a# G z! F' x2 C5 D9 f: g51 33.8916
5 f9 @' `* ~. l2 v: ]: q# z5 Z! y52 32.605
4 P+ O. S" a- [) u% M- \53 31.3734; r Y5 C) m1 R: u* q) B& ^
54 30.1944
5 ]7 M% @; ]( e+ J! s( p55 29.0653- e! K, A' o1 ~+ ^
56 27.9839$ a+ _( i0 E* W& _0 { H1 b# J: n2 s
57 26.94784 a9 e* Z* J5 K! Q
58 25.95512 J! O5 V3 k3 B
59 25.0036 T! O) C* t3 i- b' F0 ]
60 24.09155 Z$ @% d! ^) M4 K9 d
61 23.217; `1 r$ i) \+ [7 Z1 {
62 22.3784
2 G& B {8 ^+ k0 [& n! C# n! G63 21.5745 N/ i6 C; `1 t4 R* z$ y, X
64 20.8022 ?2 ^$ t6 A- R' V
65 20.0617
S7 g4 w/ {4 g: F66 19.3519 r5 G6 M8 V8 Q; C5 [9 i* B
67 18.6687
4 Z* H& c. J+ ~! r68 18.0137
& g% X5 \0 C5 s4 ~5 L- z69 17.38474 r1 b* g. A0 ?2 l) I+ J0 V6 y
70 16.7805+ K! ?: [( o& m3 W) Y
71 16.2001
4 a& W1 t! i) t; |72 15.6424! z( N3 E: q) d. f' Q- Z
73 15.1064( {8 G; d2 i! M' G( {
74 14.5913
4 c" y! `: T9 _& W75 14.096& E, j. s5 g4 @; M/ G
76 13.61984 q: m3 a. W8 [
77 13.1618
4 I/ r) x# x+ K4 Z5 z% `& O+ J78 12.7213
9 Y" R" |7 g' q% y6 }7 m79 12.29759 Q0 F7 I4 Z. ^6 n+ L$ x
80 11.8897
- ^, K: M g: \1 L; u6 ?% ~81 11.4972
8 e, Q2 W5 Y& ~4 O' y/ |0 E. P82 11.1195# s- u- H' Z! S4 r$ h) o! T
83 10.75589 m2 ]$ N4 k, l- Q
84 10.4056
6 z- V, L+ \" w+ i* ~85 10.0684
+ I! Q1 M7 T0 L9 Y. q |7 k4 [86 9.7435. E- {# ~. s A, s K
87 9.4306
) C1 S2 ]# i% d0 t+ P" p' W88 9.1291, }( I" w, N& u* V3 R
89 8.8385- J! P* y+ Z% F
90 8.5585# _% z1 z/ A2 m5 f" a# g- d' O& t
91 8.2885* ?: N+ c+ x% s3 S$ D+ f& w
92 8.02836 x; D% |. W: o5 o
93 7.7773
# ^0 p3 ]- i4 d7 o: M94 7.53521 F5 e+ L# V4 Q- w! G; s( ]
95 7.3017: k0 y& X* I; V) u! Y! m' u+ U
96 7.0764# W: Y8 p- @# o! S7 w% i" {
97 6.8591: y" G- s+ S; ? C6 ?" n
98 6.6493
4 o0 u7 S) U8 x3 G& H- N99 6.4469
% M6 C/ K# P O+ t100 6.2515
* j1 Y3 z8 J# H* Y% h/ t2 _101 6.0628
2 ?9 s8 E5 a" S& O% W/ y* X4 ]102 5.8806% P$ u8 x4 {0 E# {
103 5.7046' F3 f. K7 Q0 ?& k5 N8 R
104 5.5347; {9 W! h0 y2 V* y& r7 W
105 5.3705+ m1 e- l9 z, u d/ g4 h
106 5.2119
! v& U4 o/ C; j, [$ n1 c107 5.0586
2 M9 k6 t- Q; J- a+ w108 4.9104
]1 _+ W* J _# T- [. t$ u! [109 4.7672 T+ H% L% c1 x
110 4.6288
, `& p* _$ J# r. j111 4.495- v! n) ~5 h4 L0 Z! ^
112 4.3655
; T4 F) |, P" \: A% p2 t, g& y113 4.2404; Y u6 h2 o; O7 T `1 f# p
114 4.1193
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