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本帖最后由 hi_yjs 于 2013-1-25 21:14 编辑 + u1 K! Z. ]. A" \
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最近用热敏电阻做个温度计。% K5 T7 k- u) D0 Z
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。: G# N2 R+ m- d5 g8 ?' _' Q
请问该如何写出较高精度的程序呢?3 x) v1 c0 i+ ?3 c0 x+ ?
(查表吗?那样表格会很庞大吧?而且取值也不好计算吧?)
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. Q1 _% \9 }. }+ R付热敏电阻部分对应阻值表:
8 m# G* J" C' e0 C+ [LT804;BValue25/50=4020;R25=100K
1 D. o$ f7 }& V- W N X+ ]温度 电阻值
" z8 a0 F" L6 [* B$ q' `-50 7291.38
" J! ]! p- u, j+ r-49 6774.88
3 Q) o0 l+ P" I) ~-48 6298.61
4 N' H. F0 M% a9 o4 y5 D- V-47 5859.176 M C% r" ^$ J& u9 Y% v
-46 5453.45" @. S7 K2 T5 R9 B- ~9 Y
-45 5078.669 P0 d1 e* `" t
-44 4732.22" y8 G; w, p' R
-43 4411.8
& C+ K. d6 b6 S0 b) f+ c-42 4115.289 M4 ]5 M, O* _' l6 Z, v1 {# r
-41 3840.72% b% g+ K) X. \6 o4 R
-40 3586.35% G ~1 T! ]9 j8 M2 F
-39 3350.55: y& |7 m: ~ T _1 p7 N" }
-38 3131.85
3 Z0 o/ h6 Q3 q-37 2928.97 V7 a3 l* R! L' v& s
-36 2740.46
$ t: V( U- \! b1 e5 B( s2 f; {& {-35 2565.4
3 x- Z7 R. R5 Z$ N1 g-34 2402.696 |7 ]+ {5 `1 p: ]" }9 f
-33 2251.37 A$ f7 T1 t3 J' J. Z4 W* V
-32 2110.58
7 ?+ Y# Q+ [* S) ?-31 1979.52$ k" s: Q! {# M& O m" g7 w/ X1 Q! v
-30 1857.46
. H, g. g% d+ m/ M/ M# D-29 1743.72
4 D5 p+ s4 j7 G9 [$ ]-28 1637.68
5 O$ K& m6 q0 ?-27 1538.77
* Q& s0 S* v. e, G-26 1446.47
& l8 ~3 ~& c4 R5 X/ z' u& N-25 1360.3( {. H; @0 q3 C5 L M( E3 Y' g
-24 1279.82$ ]% r1 j9 o. q# @' h, k3 {9 q
-23 1204.61$ \( ~% {+ ]7 k x6 p
-22 1134.295 r0 V2 _/ s8 f
-21 1068.52! _0 [8 ~+ a# t, {
-20 1006.98
' V3 x) F8 ^, Z9 O6 Z-19 949.368
! M$ y: N/ {; ^) g% b3 ?7 \4 `-18 895.411. W* U* c u; B, p$ q- T8 e' Y0 {# C
-17 844.8563 L& J' |; ]2 ^
-16 797.4670 T% p, P# K! l# y8 x4 V5 L
-15 753.028
( e. g& F9 R# G/ P; C5 F-14 711.3386 n* w* b. h- E
-13 672.211+ i: g) q' X g8 b" G2 D# R
-12 635.474
. S6 S8 }9 T1 V5 i, O-11 600.967
- ~; v l/ J3 J8 u2 l! C-10 568.543 F8 ^* E& M9 B/ K' M
-9 538.063
7 p) W. _! p' R8 C. |" n) b-8 509.4- d" O7 `/ C8 e6 l% I7 z
-7 482.435 E4 G8 i8 ?( m5 a( K1 d' u
-6 457.057
* {6 o. `( q* _4 D8 H; H' g- E: n4 _-5 433.1659 ]# O: R& _8 Y3 N+ J: a
-4 410.663
! C" f% x! s. E4 D1 _' p& f-3 389.462
9 [4 ]9 Z8 V" {: ^* N+ e9 D-2 369.479: i) N8 W$ o4 k, L( T
-1 350.639
- {% r" ^8 q7 C: }0 332.8689 ?: N0 ?) L: j
1 316.102
0 `% e" W8 M% U. C9 L9 h, e% o- o2 300.2768 {8 v( C0 K8 x8 H- [- n5 m* W
3 285.334, K% ~5 t- _3 _* `6 r9 O- A
4 271.221
; D6 t; \# H6 D1 r8 |5 257.8863 D, ~) W C3 S! y% o1 R
6 245.283
* z3 U* G5 o* R; _8 N7 233.367: T! J9 J% X" c( x- C
8 222.0983 H1 O0 ?+ G; y" v: \4 O
9 211.435
1 ]: R+ W5 g! J9 [* F10 201.345
0 \, ^2 Z" f( I9 a, U( k11 191.792
% m J' t4 A& X6 a/ L5 h, d12 182.746
- T7 L. u9 R6 `& _13 174.176
! f" g* F, H, y14 166.0564 P& B7 m* C1 s9 o3 m- c6 W9 M
15 158.359
8 l {5 y: U1 }& P" M6 @& Q16 151.06# B: t' F: f* B, w8 p! }
17 144.138, e6 K/ F9 x9 D4 K c4 M
18 137.5712 n- s+ p/ t6 N8 F
19 131.339* F9 c, c& E" A0 B
20 125.423
6 t7 s; a6 B I21 119.805
( c6 }7 D; }7 n8 T$ M22 114.4699 _. j/ h! _$ e% _
23 109.399
# E9 V/ A, R8 P* z& r! U& Y( Y24 104.5812 x7 v2 g! K0 h: Z: s8 n
25 100; ]. L, @+ P! S( L3 Z
26 95.6443
# n: C5 _4 b# o" y" ] r6 J27 91.5013
o( ~0 C& ]7 h }8 ^28 87.5596
- W9 p; _7 u+ i8 e29 83.8083 w( h7 I% j* D! l; e, f/ u& ]
30 80.23723 T+ X! c& w" w" X# [
31 76.837" G$ Y% S: o2 S6 D# [
32 73.5984' x4 ~3 e. V' c1 `3 n8 ], ?
33 70.5131
. H& [% g) }! O+ L- ], _3 }34 67.573* P9 _ V( X3 ^4 A5 a3 J ^
35 64.7706
0 i; c) y- o! i2 w! a9 ?0 O36 62.09874 v/ F8 n, n1 I+ _& ^8 _
37 59.5507& O: G& {, ?9 ^, ?' ~. o& _
38 57.1202
) O% S/ [! u, J. f& f+ b8 X39 54.8011
; z W" c+ K* w; z40 52.588
; r$ w2 R6 E: d5 ~4 Y41 50.4753
4 o/ j# [# }4 f: y+ A3 A* y42 48.4581: M( _, h5 x: ?
43 46.5316
" m2 Z* f; {* I, c3 q1 U44 44.6913( s* w) K, f9 [. P
45 42.9336 b! t& x5 B! V0 A; J# }$ w2 L) w! |
46 41.2525
! X9 ^3 [' w A/ F: w0 s# B" b. D! I( t47 47.3965
' [3 h4 h% j7 M* M; Y48 38.11- Z+ z8 \4 {4 D5 h+ |
49 36.6411
: p+ u6 q5 f; ]5 {/ ~6 ?50 35.2361 m, ]: i* t- g! w8 T5 }# ^; r, a
51 33.8916
4 l& H" q6 i# b: a4 u; v1 K% l% f52 32.605
7 C1 D4 z; ]/ _7 N& m( {+ N5 C53 31.37345 y' L1 l- r+ V U, S" A
54 30.1944
3 w% r m4 r3 u- U7 }55 29.0653( h' x* s7 e/ R# c0 {. G v) e
56 27.9839! H/ @- e" _6 t0 Y$ z
57 26.9478
1 P, a k) A3 A4 n/ p; G58 25.9551
! x# A' b9 J# t59 25.00368 o) q2 r) y" W( k
60 24.0915
% X4 c( K# z1 N+ Z61 23.217
3 g3 z' i3 W Y6 E e62 22.3784- ^8 J+ M/ |4 D' b2 P- n+ E8 d
63 21.574; j; j" p- @! P4 e0 Z* ^8 h
64 20.8022
4 X' t/ O; i4 n# u1 K! ?4 ]65 20.0617
6 `9 o& u' d1 u! x- s1 e66 19.351# t. Z3 A) t5 X3 @, [5 u0 A, _
67 18.6687
" `% Y& f X8 `6 u% v* ~68 18.0137
% t% |1 C) V5 A* p* Z69 17.3847
: X: x6 W0 `- k D& k* E70 16.78059 V! }+ L9 c$ K
71 16.2001% m0 w$ S% N# w; L/ ~6 j7 K
72 15.6424( S4 Q. E. Y9 I/ U& k
73 15.1064" w6 q5 e6 `8 e8 v. ?2 |
74 14.5913! Z8 c/ Z* d' M& y8 g/ R5 f" W
75 14.096
. f3 _5 O& n3 b76 13.6198* V$ P" a6 d8 L& o2 H
77 13.1618
! u+ O7 H; O' J4 I; p d) k78 12.7213! i; ]) N- `' d2 b" \7 }: }
79 12.2975
- F. w1 E- [# d0 w& J80 11.8897- K+ y m. w! P) b
81 11.4972/ R3 `# C( i, }
82 11.1195
# F! c2 ?- u( H" }, d83 10.7558
0 s9 p1 q( D, j% X7 g* T8 P84 10.4056. J7 ~5 n% y0 H N* h3 U
85 10.06844 M! l. |& @& ]9 M
86 9.74350 U T2 u( K+ ~' ?# L
87 9.4306
% D, T. E% N9 ^% i1 F88 9.1291
_( ]! D c( Z( |! w' ^* n89 8.8385 ?! T1 ]$ K& T3 j- @, \( S. F0 l
90 8.5585
6 I3 R- b2 [; f! M, r3 q91 8.28853 J' r1 t" m& H1 r# A0 T
92 8.0283, ~- H& A' \3 y( c( n" {" h+ x
93 7.7773
4 D4 |* D3 K6 p/ p6 X* g94 7.5352
: ~8 B8 I/ d0 A7 r& o, i5 N4 l95 7.30174 |9 ~/ F. L9 e! w3 G* f2 `4 O
96 7.0764. K5 {; A. A+ `8 F, @
97 6.8591* P5 [' {: ^! Q
98 6.64930 X) }5 H0 b/ A8 w7 }% U% Y/ w
99 6.4469
0 c* X% I& W9 b2 e6 _% G* n100 6.2515* J- ]8 m: }4 d; Z9 z( J5 }
101 6.06286 X2 h% S: g( M2 v
102 5.8806
5 K) W9 x0 N' J/ X* o0 c103 5.70461 }/ ?6 s3 B) b+ A4 Z: `
104 5.5347
* k3 }$ f z Y! y105 5.3705
; F& \0 O9 P: w5 r) W106 5.2119, g* a- P' w4 e
107 5.0586/ _6 A$ E$ T e3 |3 K' g$ \
108 4.9104
e) a' T0 n0 _( G8 Y0 v1 D4 x109 4.7672
1 G" d0 ], g9 m: y( k2 w110 4.6288( b2 s6 R: h6 G' T: R
111 4.495
0 V: K* H5 C5 p( Y& u) a, f112 4.3655
% | g" w( k6 d2 f9 h$ l$ j113 4.2404
- \* T9 J3 K7 R1 x9 k114 4.1193
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