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本帖最后由 hi_yjs 于 2013-1-25 21:14 编辑
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最近用热敏电阻做个温度计。4 j6 o" {6 d2 ?
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。8 c- Y' l) `% T
请问该如何写出较高精度的程序呢?
8 D- @( c- q% E8 q1 d(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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( a8 E: M. W1 t/ f& v5 p9 y+ X9 k4 X付热敏电阻部分对应阻值表:3 l% X2 o6 z- x6 w5 A, K& C6 v
LT804;BValue25/50=4020;R25=100K
; e* J( X+ r* {4 x+ w温度 电阻值
- P" K3 E" I, H1 A: P, S- a7 Z-50 7291.38, Z" G/ R$ [" X% W+ `
-49 6774.88
2 A( D+ u9 d8 ~9 ?2 U* a/ _; A-48 6298.61
( i% V$ k0 [. A6 W8 ^( A-47 5859.17& c* S3 @& j4 D/ E1 ~9 M
-46 5453.45
9 E- n3 ]" a; {9 v+ O% M-45 5078.66
4 s Z* R9 J" U, V0 r5 X-44 4732.226 _- m+ C; Z2 ?$ Q
-43 4411.8
$ \/ a, `4 ]: ]$ Q; B& u-42 4115.28! S; d; V, L x6 Q: j. \4 B. O
-41 3840.72
|, ?% ?! ?" Q; r9 j( O; \9 y-40 3586.35
- T- l C L( v g$ l/ s* [-39 3350.555 z* }% p& o9 k3 J! g5 R4 e
-38 3131.85" r ~' b: T! |) V. h1 ]0 Q
-37 2928.9% Z" C6 Z/ W) r6 U8 F' ]/ L& ], D/ ]! E
-36 2740.469 K* a; u$ t K: m8 I
-35 2565.4# |6 ~5 u% b$ N; \
-34 2402.69
h' R! J& j0 {-33 2251.37' e1 C. w# C" H3 b/ `4 k
-32 2110.58 M+ }" {3 a# g8 r0 E3 @
-31 1979.52
) N. Z t: Z1 S$ M+ e-30 1857.464 T% l! j& W8 L6 M9 x$ o; j) ?- Y
-29 1743.72
" ]/ Z0 B7 t \# v2 N O2 d9 }, B# [-28 1637.681 {9 O* d' b7 u- o Z
-27 1538.77
3 d* Q* g8 H% f7 ?* z-26 1446.47
2 K, t" i. d* J5 p-25 1360.30 g. g) `5 ^5 M6 g3 E
-24 1279.82
6 |$ i, s' i8 ~ H: E-23 1204.61
2 F# e8 Z2 v c! |6 f$ |-22 1134.29
l* u u- g3 A H+ ?- t2 F9 _-21 1068.523 M) A! Q! B6 ~
-20 1006.98
" Q( _) z. Q" c# I9 x) D6 ?6 I-19 949.368
3 c) b: N, a2 K7 o-18 895.411# n# U2 N: Z1 |
-17 844.856
7 V g* L, ^3 `, @-16 797.4678 U; y% m6 N* C, b: V. o& W0 d6 f5 K
-15 753.028
2 M2 n H: P Z5 o7 t+ p-14 711.3386 ]. v( p4 O3 A$ ^
-13 672.211
$ c0 d* n4 y( x5 t3 y-12 635.474
! a( O/ m- P" t1 {7 G-11 600.967
J( W) Y' k+ o-10 568.543- x0 I4 e7 Y, Y% H: @
-9 538.0637 j4 q, V( K: I! W0 q, l
-8 509.4( q* D' L' G3 C
-7 482.435
' d2 P3 b( f9 H; c+ K, r9 q-6 457.057
- F2 Q8 J" L* g. W: g-5 433.165, f; a6 [5 t) k9 H' m' o& Q- Y
-4 410.663
' t* a. K) t+ r6 k$ J. v. w-3 389.462
9 ]! l5 @0 N) m7 C: I-2 369.479" u; P! |" _" ~) f
-1 350.639! N" c1 J1 i" v
0 332.868, o" y; w- l( r7 w4 w
1 316.102
( m1 J/ |2 a9 N0 F0 t6 P2 300.276" {% B; B2 t3 z3 ^/ _$ n
3 285.334
3 D3 i4 `! A% Y; b. F/ A4 271.2210 X2 C$ Z5 f3 j
5 257.886
6 C ~ ?, F# f. O! N* t- T6 245.283% g0 A i( j$ d, X8 v( z( @
7 233.367
! X& l( `& S/ \; r% T8 222.098
' Y0 C# _* M# z R9 211.435# l/ l/ b9 l% y* J( y
10 201.345
3 n! W8 i, u) w J+ f& T! F11 191.792
- t1 P' a0 ?+ z. R$ o. c" a9 w9 [, l12 182.7468 C% Q0 E( u, f% P
13 174.176' z( B/ B0 x' Y% x
14 166.056" P" l( Y# _7 E& L0 j; }4 C
15 158.359! ]+ t3 f- ]% S+ ^7 J- d
16 151.06# D$ h. R0 j' R) p+ v! a
17 144.1382 O. P3 }4 u, i$ d+ x, a4 ?
18 137.571
3 U7 K- B% E6 t, G19 131.339
( [/ O! q ?5 M# s8 R+ ?20 125.423( `/ o3 I, C1 W; @9 o
21 119.805 L! _2 q+ c' X. B0 m2 L) E
22 114.469
+ }; `! l1 Z2 y8 v H X23 109.399
, @1 i+ U% Z: V+ M W7 i4 J" C' W24 104.581- C @6 H7 v* R& Z& b4 X* a6 }
25 1006 X) ?1 u& w# [
26 95.6443' }4 Y8 D, {' W7 K7 t" x. y6 M$ T1 ~
27 91.50137 m+ a! l: t9 K3 `
28 87.5596
9 J& W, K) p/ P# S. C29 83.8083
! t. T2 A* o9 Z+ \; B( |30 80.2372
+ D) q0 j; Y9 G4 R/ o31 76.8375 ?6 g8 o8 k, y$ s: K
32 73.5984
8 n) h7 k3 K$ F! `! a( @33 70.51317 W2 Q! {$ c' B* {' K
34 67.573
9 k9 t" g; ~; Q, A3 v35 64.7706$ ?+ ^! ?- |& G: x J
36 62.0987; |/ g" F" e U! k
37 59.5507" Z; U# ~# `/ ]5 A5 M0 o4 j. D
38 57.1202* U$ T6 W- w3 H( J* b2 }
39 54.8011
+ I. m# O F2 |3 Y( s4 U40 52.588
6 l# B W F0 V6 z5 S5 k41 50.47537 |: O9 x3 n" D. j
42 48.4581
' Y$ B* N8 [& v43 46.5316
9 }: f K. M) c8 @44 44.6913
: W" x9 W) j. w4 a5 V45 42.9334 E; i7 ^" R1 l+ ]# o z. `
46 41.25258 J! S- U2 S& T6 S5 s* i0 a, _
47 47.3965+ c8 @, I' F9 Y) s& f* v- |
48 38.11
( f3 Z% s( g# c# Z& X% @49 36.6411# L# D6 ]6 q5 Y
50 35.236: G; B2 N! Y p, z! }, Z, Z
51 33.8916
0 c2 [& Y% Q0 v1 ]7 C8 H52 32.605
4 ~+ F6 V t& q53 31.3734
" s% D* |3 f- F' c2 ~54 30.1944
; i' N' z* u* p55 29.0653/ n6 f) N+ j. J7 x9 ~2 J2 U0 J* \
56 27.9839
Q7 p {: t' c* |6 g57 26.9478
: I6 |6 K9 C$ g# B9 ~( i58 25.95511 x/ s4 ^0 S# l8 n
59 25.0036
, ~+ F" Y7 K% B0 K9 k- }) Q60 24.09150 V9 e6 c# R- A! `0 g, ]
61 23.217
! i- l, ^ w3 k4 n; o D62 22.3784
1 e8 j; X5 m B; c$ w4 F# h63 21.574& F" d7 h4 ~/ u5 w& L
64 20.8022
' ^+ y3 B( c$ x65 20.0617
4 |( h' e) ]) K h1 M& K8 K66 19.351" ]1 s5 h- F( D2 b) ~0 b
67 18.6687
8 T" r5 M3 k2 F6 P& q68 18.0137
8 m# E. ?9 S) p2 H- x1 B69 17.3847 ~2 Q c7 |' G7 C
70 16.7805" c7 M" u* j0 ?: g2 ]- Z
71 16.2001
1 H% g$ G9 `1 F72 15.64244 Y; I' L4 y" o; y$ F
73 15.10643 v# F) B9 S9 S Y, j3 I& E- R3 |$ s
74 14.59138 n4 |% j2 H4 p1 h: g
75 14.096
4 l) U1 O2 i# n1 v6 A76 13.6198
, A( N2 r2 }7 ?- |6 a* O+ w77 13.1618
" x# ~# N* L# T, T78 12.7213* Q/ V1 I! p1 Q
79 12.2975
( L. W0 q8 b' [( T6 s$ c; Z80 11.8897 `0 _" X& |% L% W9 ]5 p
81 11.4972
6 U" X* V) v, c7 l* g# E( s82 11.11959 e S6 d+ m* _9 U+ I5 E1 D
83 10.7558
! f7 @5 Y4 \* ?, f84 10.4056
. y2 y* h2 t- T9 ?85 10.0684
C4 u8 t0 h6 a5 H! m5 [86 9.7435 Q7 C$ `. E7 J$ O3 K2 r9 k
87 9.4306
7 M6 w' C4 q7 b- N88 9.1291
* @ n# h4 W! g3 F& c89 8.8385
; C3 {3 e4 S2 g; p90 8.5585( h, z, C5 M& z7 P% C
91 8.2885
# c" ~& {' p& h92 8.0283
# o( Z8 A v+ z93 7.77733 m* g3 g6 D" }$ J+ Z5 }; `
94 7.53523 e/ j; k3 \. N; I8 j4 H
95 7.3017
7 m a; V0 H) ^( F- ^ b8 J96 7.0764
' Y$ C- U! U8 e1 e8 V4 Q97 6.85910 d) |' T8 v' J& ^( v* T5 `
98 6.6493* Q# T( T9 p( K- b# _' p1 k
99 6.4469, G2 E: Z- y' n' v$ r
100 6.2515
. I# x5 E4 x# @ v9 v101 6.0628+ M7 e! K5 N! `" a) y/ c, R
102 5.8806
" R5 w8 E' g. C( |1 c. V103 5.7046. G5 }3 C( u; u! N! H& h
104 5.5347
6 `' B+ A6 l# A105 5.3705
' P. c# D. [' g9 g& `106 5.2119
( O0 d: z, D* Y! u107 5.0586* z) H1 ^6 @7 ~5 t. e! E1 q
108 4.9104
, A. Q. ~+ f9 U. ?109 4.7672
* \! z, o2 W9 X5 M; Y110 4.6288
% t. V5 Y) b' B: B111 4.495
, h }- G: j* F: p8 x/ n112 4.3655
# L0 u/ ^* m1 y7 D) D2 y113 4.2404
* q3 U" W8 q3 u& N4 y) ?6 {114 4.11939 ]6 ]1 V2 Z* g- m% S
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