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本帖最后由 hi_yjs 于 2013-1-25 21:14 编辑 9 \' A5 W3 _1 K% y! d
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最近用热敏电阻做个温度计。
) t2 ]$ l2 R! t9 J8 S& Q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。
6 x8 G, G( ]& } r* J$ j请问该如何写出较高精度的程序呢?
! S7 K- x) V1 \( q4 P: U0 F# P5 M(查表吗?那样表格会很庞大吧?而且取值也不好计算吧?)* t/ L R5 ?1 t7 L
) b. d6 T1 B, X4 j$ z% J
付热敏电阻部分对应阻值表:5 G6 X2 @9 Q1 a- J6 C
LT804;BValue25/50=4020;R25=100K% L7 ^# P" d* S1 j5 [* J1 i
温度 电阻值
% i9 @/ y6 t9 B-50 7291.38- i. a' G8 m6 l5 R% Y( D) t
-49 6774.880 Y# i: g6 s/ d3 ?- i7 M
-48 6298.61
0 K' Y1 A! l# K& L/ a-47 5859.17) U7 k6 x/ z; K% y# m
-46 5453.457 M' W' X3 h! H) u1 B( ~& O
-45 5078.664 c% r6 W' i$ j# ]# d
-44 4732.221 z/ M# z/ M. v* d$ E: d% D/ ~7 a
-43 4411.8
1 V* W1 b7 l% a" f( |-42 4115.284 [( J( w% q O4 a; Y* [- o
-41 3840.72" U8 m y* r% [; w6 B: p3 u# E
-40 3586.35
; E+ J4 a# s& @) \9 j-39 3350.556 B9 o- G, k$ ?* o; l* V7 f* v
-38 3131.85! A/ |7 X1 O& \4 x f
-37 2928.9
9 w* H- D/ t( g, m8 \4 ]-36 2740.46( |# Z7 O% G7 u! k& l
-35 2565.45 h2 v0 J. D% D) q7 m
-34 2402.69
& ^+ j4 F9 J. D0 r8 E# X$ p-33 2251.370 I; v9 S9 c7 v
-32 2110.58' V; i% g- T! \8 }
-31 1979.52" {4 ^5 J' x$ X; _% @4 z x
-30 1857.46
5 @, a N6 z) J0 S( P6 M7 ^ u-29 1743.72
! p; ]9 W3 T% q! j-28 1637.68 ^4 D& ^/ {6 {: V
-27 1538.77- r3 R o) i8 O- q4 u9 C; c( Z3 l
-26 1446.47) x" I* F( ?* e8 H+ ?
-25 1360.3" M) m/ e2 V# D* E5 R; x2 u
-24 1279.82, y/ q/ s" S$ i% |9 U* a
-23 1204.61+ c, [8 j, r0 t6 O2 B$ f$ E# ?
-22 1134.29
% p5 j% _' ?7 V2 E3 J-21 1068.523 k% b5 z& n7 x' E/ y
-20 1006.984 y2 _ d7 t: g3 j' }
-19 949.3684 d, U3 o% B2 A$ A
-18 895.411
k& F$ j$ o: c" X2 U-17 844.8566 S) ]9 i A7 }0 k+ `5 x- O
-16 797.467
a6 r/ }8 n( i+ A, B* g-15 753.028; |0 f5 J- B6 F& \; g) K# z
-14 711.338
+ D* @. x+ [# h8 K$ T4 B-13 672.211) {5 u/ V8 i1 F. G' Z
-12 635.474
1 @% [, ?, h8 g-11 600.967 A; b0 B' x- ~6 P" g# Y
-10 568.5431 o. a: [# x' |9 L, N( n0 E0 d
-9 538.063
# |# i5 |0 R% s9 K. S-8 509.4
3 Z+ H6 ^$ N0 R5 F) ?& O-7 482.435
! y. J5 C* j3 @! B; U1 |' Q5 @4 ^) D-6 457.057
, U2 e! R& S! j-5 433.1656 A% ~/ d/ F9 P" [; b
-4 410.663- M1 j& l6 g& z4 C+ h$ C& o
-3 389.4624 j8 t! \: f1 U! L* S f8 L2 E
-2 369.479
9 J- O; a2 y7 r& s-1 350.639
) r( j6 O+ Z( S* [3 g0 332.868
' U+ T( f( j, R6 P8 a1 316.1026 Y8 f# ~3 z3 @4 _
2 300.2769 B' j( M1 Y+ j
3 285.3341 E6 X. i- L2 ?& s( w
4 271.221 b+ V8 e" E5 O7 M1 T, `, @! n
5 257.8862 [+ n8 o" x! ^# M
6 245.283- n1 m; J9 o0 ~
7 233.3679 _! `) @- ], w
8 222.0980 q" f2 r- E/ v( Y
9 211.435
. d8 u# c; _$ b4 f( a10 201.345' v" a) e3 S% }
11 191.792
% e/ b* y4 u& p+ x+ [12 182.746) F7 }9 \& J7 q
13 174.176! g8 L Y7 T. w- _+ x- W, k- j
14 166.056
4 d9 O* C5 O& A, i15 158.359
% Y, {: n) `6 W% F16 151.06
5 i* E; P4 L. i9 `7 I- C( u9 e17 144.138
2 @, [" H/ ]9 Y3 @18 137.571 S: b& I- Y) R$ W% N/ c
19 131.339- B% n. K* G9 I) ~$ ?" K3 G
20 125.423
6 a E* x" V* c; b21 119.805
( w* B r) l+ X: q22 114.469
1 j `) w9 x$ e a3 |23 109.399
# D+ _0 `, a! d5 ~' k% L24 104.581 t% J. ?4 q6 k+ z5 Z) W
25 100: @3 y& E+ m/ S! M
26 95.6443
( v. r x3 z# Q, ~5 ?+ Q: p27 91.5013. j" v9 E: s h: m* I
28 87.5596
/ i6 J w+ k1 P9 C# f' a29 83.80832 H* g; U4 Y) ?4 d7 w& `0 S, m
30 80.2372, X3 i1 J- ]) _" s1 z) `
31 76.837
. C+ e/ j0 h7 M( u# J$ @32 73.5984
1 z" J) H$ H! M+ U, ?7 @33 70.5131
% c8 E; Q' N5 _" e, F6 B1 ?( u+ \0 |34 67.573( o, u% K8 U C( L% l
35 64.7706+ ?. w' u: j( X: ^1 [/ G8 M
36 62.0987, m" g! [; l' c" \- H) P! {
37 59.5507% x) E9 |% l, l8 z
38 57.1202
$ [1 M. H9 N+ a! _4 ~39 54.8011
l7 _3 S* w! q {6 F7 @% M) L8 T3 ~40 52.588. l% U7 _" O( p. b0 |) M
41 50.4753
- k4 j$ l, x5 ^( ]+ Y; W42 48.4581
) O, y1 Z* i% W4 ^" Q43 46.5316# w6 U# Q! s1 o2 n
44 44.69138 x6 B# x; ~1 }! v
45 42.933
0 @0 ?7 i5 z4 ]1 s6 y' B- P46 41.25252 ^; x5 \* l$ D4 `( ?
47 47.3965+ w8 p7 X- j1 m% }: C# G
48 38.11
% Q1 P/ n. b: ^2 o$ H3 \1 W6 R, j49 36.6411
+ \) `( S- x( } s50 35.2362 f3 f0 q9 Z* S3 a; k8 z
51 33.8916
1 |/ @( \( |$ ]. ^52 32.605: D4 _- f. p9 D& F& ]0 h- \- p
53 31.3734( T6 Y% u' |9 a4 h
54 30.1944- ?1 g* F1 D$ _& @, E6 J$ G
55 29.0653' C% u" ~2 g+ H
56 27.9839" O# Y& i' O9 q# n! u
57 26.9478* g# r7 e" P& E: v5 X0 a# N
58 25.9551/ q a( `0 B7 M1 c$ X
59 25.0036
. Q; C' U& y9 l) s" c" v! t9 e5 M60 24.0915
4 C6 ^4 W9 x- y J7 G T% R8 ?61 23.217
& j; S* t ~5 w$ Z62 22.3784
. E9 @1 A" t* J( {7 g- S" W63 21.574$ x0 ^0 e! U+ @1 `# \0 T9 @
64 20.8022
8 p* C$ j5 f) Q65 20.0617
; E; x2 E0 I0 c8 b66 19.3516 V; X6 u& r: r4 w$ V
67 18.66874 O* V9 r% q& C' p/ l
68 18.0137
3 H+ U/ Q& i/ u; G69 17.3847
% A. \1 D, _6 P$ e70 16.7805
) z) H9 g3 g: P71 16.20011 c0 d+ M/ g3 b, i+ l$ `4 h4 x
72 15.6424
8 F5 I4 W8 ?$ T. j' C8 D. n# O73 15.1064 d3 R; M( f& m6 u+ f8 N; S: d5 |
74 14.59132 D0 @) b, ]! ?# r: u
75 14.096% q( ?( q. c* d4 {8 h! f$ ?" D( m
76 13.6198
( j) a% d& ^, J! l2 f: @. c- a9 J77 13.1618
z/ l; N3 A9 J. S78 12.72135 C1 R0 ?/ v3 S" O; n
79 12.2975
- W+ p9 x: _! j: [. E80 11.88970 @* |) |0 Q5 S* e" y) Q4 v. w% R! r
81 11.4972* J! |+ F. D" d8 K
82 11.1195
: ^; H% |! R) v6 R83 10.7558
0 `) P9 G7 z: j/ k9 i# w3 F84 10.40562 s& y u. D) `. a7 W1 n
85 10.0684$ @5 v' f. E K" p5 k+ W" Q0 V: X) V
86 9.7435) h' `; x3 b) p+ \0 k
87 9.4306
% I, l6 e* h) {- R M3 O7 O88 9.1291) m$ A( I& Q+ r; I' T* `
89 8.83856 L7 T v4 C. K) w M z, i
90 8.5585
! [9 `% d$ S( B/ Z5 w4 I91 8.2885
! u, r+ [& w: \92 8.0283. [- F6 r; S3 t. R$ I/ i1 d
93 7.7773
/ g3 D) `9 Q4 c) R/ S+ K94 7.5352* ^! R l w. e5 {( z% f
95 7.3017
4 j( I- ^2 G8 R. }96 7.0764* d4 x7 V! ~& V* q' o7 b
97 6.8591
; q4 I W2 V( N1 Y$ i' D98 6.64938 I1 v) W, t' V* p) p, Y
99 6.44696 h$ \, T- \. D, M, }, `
100 6.2515
4 C8 M6 n ~$ Q3 @! g3 U6 Q9 F101 6.06282 P! x$ q+ F8 j3 T3 @
102 5.8806
$ w* F+ Z. v/ e103 5.7046
; F/ p- {% o7 T T104 5.5347- S3 C- j8 L$ ] o, A) z: G/ M* Y
105 5.3705
7 z+ l4 u6 \ F$ ]5 }" v106 5.2119
/ P! Q' d G% p0 `107 5.0586; M$ ?3 C9 P% `( F& w; E
108 4.9104
3 j+ { o B: L8 I# |( k109 4.76724 u+ f) s a# e" Z
110 4.6288
+ k+ b) _: O) |0 M; f/ L111 4.495/ c9 B, d* y' g z' d# d
112 4.36556 x2 e/ E7 H% d, K# R. Z4 i7 P
113 4.2404
) u! Y2 M. d9 p114 4.11935 f/ p$ q& ?# g$ F
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