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本帖最后由 hi_yjs 于 2013-1-25 21:14 编辑
) k3 X# R G, U" F) o
?( \/ E) l4 H; v1 g最近用热敏电阻做个温度计。9 a- J( Y* r6 F* D
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。
5 y* D: J& m+ [# X! O0 Y请问该如何写出较高精度的程序呢? H& Y' x7 A4 x
(查表吗?那样表格会很庞大吧?而且取值也不好计算吧?)
% n& E# H7 s. C8 B
" Y0 W l% [3 w E- S! h; J, F付热敏电阻部分对应阻值表:
+ [6 u9 a, h; z wLT804;BValue25/50=4020;R25=100K
$ u" i& y( k5 e温度 电阻值. h w3 V2 J* d0 h s
-50 7291.38$ |- {9 O9 `# e* X1 j
-49 6774.88: x) c" A6 r- Z* k5 V
-48 6298.611 V; t& R! n H, a- a+ [. E
-47 5859.173 l% T* W* L! `# {
-46 5453.45: R# L* ?6 n* c1 C4 y7 c
-45 5078.66+ U X! i& I! n
-44 4732.22% U4 f0 Y. f& y: p5 t+ t$ T
-43 4411.8
( f4 |$ c1 w4 ]' Y. z; D Y-42 4115.28
" O: {2 t" t! o% L$ a3 [) w-41 3840.727 ?. s/ ]" k9 L8 P
-40 3586.35: ]# r. |/ G. Y) J/ k" [+ V
-39 3350.55
% t4 }5 J; n3 L5 L( P% C2 J3 n-38 3131.852 ~. U1 R N! `' {5 Q! ^
-37 2928.9
- a' O1 _2 k, O, P# W1 T9 a2 ]3 L-36 2740.46# G' c5 I# U# a9 }1 [
-35 2565.4
/ k; i4 j# j0 T- D$ x7 v% j R6 C-34 2402.696 S) V M6 C+ y
-33 2251.37# d( y4 q$ V( `. H0 W/ `# w+ j
-32 2110.58) |& W* M1 o" Y. W& R
-31 1979.52
, N# m; {2 |6 M$ D-30 1857.46
- O2 {" D- A* d" G1 U% ^ C-29 1743.72; e9 B% Z& V3 x y# ~+ r
-28 1637.68
, D7 a9 ?. t! Y, o) X* O: {-27 1538.77
. ~, ]8 B/ Y6 D( F6 X5 g2 B-26 1446.47
8 v0 c6 ?3 v. i- k-25 1360.3: U* S& F5 s! M! Y1 B6 e2 m
-24 1279.82 E c% j d) L3 {1 Q! r
-23 1204.61, P6 a$ R& K' ^( W$ z z; F" ~
-22 1134.29
# i) j$ H4 }8 j-21 1068.52
0 b( o& L/ i3 }- F# i-20 1006.98+ v" i- Y( P4 ^3 u1 s: e& ^/ N" C& E
-19 949.368
4 m: W. E" I9 k o* ]# z p) g6 P7 L-18 895.4113 w* P: v' x8 K% L) x, q/ A
-17 844.856) z8 Q+ \5 x- ~+ D
-16 797.467
3 P! i! _: u7 C" _$ G1 m+ v-15 753.028
& n, q, t3 H; p: I) c' c; W, o-14 711.338
) b. f1 e. A- F3 H$ z X+ d-13 672.211% Q T" F. [# R2 @. s/ ?2 G
-12 635.474% s y& i9 c6 c2 c j
-11 600.967
. J: _$ F P. s-10 568.543
* K; p$ d' x+ d# h; s: K! `-9 538.063
, R/ F9 J$ j I7 `5 m- k-8 509.4
* @9 U% ^4 M. }) p% u9 Q-7 482.435
3 l1 t( w4 [/ f-6 457.057
9 g; E! ~) |, s L-5 433.165
- N, E* l8 z: t2 L# c6 D$ N& i7 A-4 410.6635 T+ v& [ V( h0 O; \: m: q) `3 R
-3 389.462
, L/ G% v; K& I" U; ^: o _-2 369.479# K$ @1 H; y. {4 k( h2 P; e
-1 350.639% f, \- J8 D O* G% |
0 332.868
s2 X6 V, z$ U) B1 316.102
) l" R+ n' d$ _- P, n2 300.276
+ {& A G7 y- h- b# f- y3 285.334+ B3 u0 H* e7 F4 K# K
4 271.221
5 U0 m8 T# ^+ a7 a5 257.886
! L _" r5 s4 ?, k; O7 L6 245.2836 T" a; k8 l# K5 R
7 233.367& s* }/ U1 B/ M# _& h
8 222.098+ F9 u' Z. W/ [; Y% c9 ^# L
9 211.435
o( r( ~# J* l9 W10 201.345 {4 b! d. R4 u+ _. J
11 191.792" C# g. W/ }1 }
12 182.746: x' D# b0 b' F. Z
13 174.176- n. P3 `/ w3 ]4 R1 t# ^9 s6 K
14 166.0563 `, \2 q0 X. o! W4 c: q
15 158.359
/ x- Q8 W0 f& T: T% R16 151.06
/ T# o9 L% w$ u. _17 144.138
' H3 m6 N' V$ P9 B18 137.571
O2 Y/ I7 Z' u0 Q19 131.3392 `2 S: g, [4 b- F8 W! {
20 125.423; u& F- m+ y8 m2 \" D& |& q4 Y( `
21 119.805
2 M% y* O* k5 q" e7 K, B22 114.469
) d7 I" l$ j! Y1 x: Q' Z% t23 109.399 g! S+ [% M. g
24 104.581% F# f0 p: P; M$ c# Z
25 100/ a* D; A5 g: M- _7 t
26 95.6443
) |4 ~* F( ]0 y: R! m27 91.5013, ]" E L( ^6 J8 c3 a
28 87.5596
' Q2 k' `) C7 S+ k9 ]29 83.8083
' [( p3 e/ ^* g9 e7 W3 g7 v7 L30 80.2372
7 o* ]. M2 u3 F$ e W/ Q- i31 76.837
7 h' I: v4 Z. b$ ~4 F32 73.5984+ z& | \8 P S7 R8 A% E% R
33 70.5131$ _( C b4 l2 M' A5 M
34 67.573
* u) @+ x- i" G35 64.7706
& L3 d$ H. P( H! i2 a! P36 62.0987
N, ?$ X( _% _' Q+ e37 59.5507
6 y) H! g: F$ r, G9 W38 57.1202
; o, j9 C2 b6 T+ z4 B; J% g- K+ x a39 54.8011
- D! s; l8 e/ n+ j1 M40 52.588, E) Z4 S& h0 Y$ u
41 50.4753- J b' O& D5 K/ f, K
42 48.4581( c. `: ?7 ^$ n+ g' q- Z4 B
43 46.5316% X' J4 Z6 k( J
44 44.6913, i3 I! u6 p; n8 V
45 42.933
; B7 I" j8 _# t46 41.25254 J* [9 W' S- r+ X( J
47 47.3965
& B, ]9 ^6 c- P c48 38.11
' J; B7 ?# x ^# O. z' O7 ?9 ^+ V h49 36.6411, O+ ]3 q+ z# R) u- j: J
50 35.236
8 K" P1 Q6 M8 @: B5 e3 ^* b51 33.8916
. t, x! l7 s3 T! K& `52 32.6059 b! [: Y) D8 x' p( v
53 31.3734) m. S# q: l0 r
54 30.19442 D9 x) w/ j' U! _$ N& v2 X
55 29.0653
0 m' u; g$ Q+ I5 A- V# H. o" c4 O& s56 27.9839
: y8 r" f* U0 y3 X# b$ Y/ _" V. r57 26.9478
9 B0 ~) \. M* e' |, Z+ e58 25.95518 a) P' |" H% z ^: r
59 25.0036 T8 |; J' C+ R1 B' @5 I" E; z
60 24.0915+ K) q0 X7 |3 Z. E; P" P- R
61 23.217/ d* Y5 `' J* p& h( r% j
62 22.3784
* W+ }! u: q" L# Z l& u$ e4 F63 21.574
+ r, s7 L0 q" I) X# `64 20.8022: `3 `' c" {, C! x2 h6 Q+ s" P
65 20.0617
9 U+ b U" f$ g) `# P66 19.351
3 u$ H: ?! B" O) {0 ~/ o% u67 18.6687, U' G! T3 O5 `3 l8 P
68 18.01378 b+ O9 }4 {' X: G# R. Z
69 17.3847& x8 `- h4 L# k
70 16.7805" l T$ v8 c9 _1 R( D( L0 I
71 16.2001% P) y+ ~2 x5 i% g
72 15.6424
& l S" C8 j; v$ d& E73 15.1064
1 T5 ^, }2 e7 V: S74 14.5913
1 o4 x4 F$ {- F. ^75 14.096
v0 u) @+ X6 N7 o76 13.6198
1 P* y8 d! V- r6 |( Y! U77 13.1618
: @& k6 O$ f$ _+ V" h* [78 12.7213! n8 e$ n& x! t5 U+ X5 x0 @
79 12.2975) t/ W1 q* Q0 R2 G
80 11.8897% w! W7 f2 a6 r0 P
81 11.4972* j* L4 `: |( \6 U. I! D5 i
82 11.1195
% K# V3 _3 }7 Y5 b2 J83 10.7558* s8 m- H+ b% z! o: X4 ]
84 10.4056
! V! ~- H1 @! [2 p( ~85 10.0684
9 D+ R/ x) ?1 N! ^* s+ o! }86 9.7435+ d4 w, r* ?7 g' s( ^: Z
87 9.4306$ ~4 A1 x% m8 ]
88 9.1291, G- K- K- d( X5 V: T! l
89 8.8385
* B! _2 B5 O- Q90 8.5585
2 I3 w, L, i: ^ I- i( g" U91 8.2885$ d8 S0 W% e' L& M/ |: ~
92 8.0283
( L4 f/ |" g$ C& X* C1 h) N* [% ~8 p93 7.7773/ S3 j# Z" L: Q
94 7.5352
* y. ?, `8 {2 a5 \/ x' `" K95 7.3017
. E# i/ Z! u7 ~+ {" \# e9 K96 7.0764
- b% m! s& c$ F5 G97 6.8591
5 [8 Y) Y2 |$ \. I. D98 6.6493
; I8 I" Y0 b/ N: l0 q8 b$ \7 i' G99 6.4469
' N) @- a" t4 {100 6.2515* x: o+ O* ~3 u, M7 }1 m
101 6.0628
* s8 @; l) s% W102 5.8806
4 }& l; p5 ~( X3 q. p8 t103 5.7046* e8 g/ y e k" o$ U2 ]
104 5.5347
/ s* z: S. X+ G+ n+ I" F105 5.3705
3 F, _- ~! X, i' j5 X106 5.2119# b# J( {: M$ ]% ?% o# \' e+ j
107 5.05865 E) o/ N: F& A, C" W( B- h
108 4.9104
- h$ D3 e" g6 t) i% C109 4.7672
# i1 }$ Y* S: o3 v& p+ H8 O1 I0 B% O110 4.6288
- M* H9 Q/ [' ~# D0 `111 4.495
: Q7 u7 q" \9 q4 V! D8 j5 M112 4.36552 q4 l. d @6 b7 k. b
113 4.2404
- ]3 V1 D( M% y4 ]' n114 4.1193 ^* f* @4 Y! _
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