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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。3 @( K& J F7 x- w- P2 [* {
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 Q+ E; {0 O, M- L) R7 c请问该如何写出较高精度的程序呢?
' `1 u3 `+ H$ L) t M( V(查表吗?那样表格会很庞大吧?而且取值也不好计算吧?)1 M' _6 G' c/ D9 c
7 p# g7 W% |8 R8 [$ `
付热敏电阻部分对应阻值表:0 X7 T/ b8 B9 V) A# v
LT804;BValue25/50=4020;R25=100K
) y5 K! l6 k* C3 z温度 电阻值, E6 y7 Q4 |# W
-50 7291.383 B2 P9 U3 ^1 p, e% [9 j. G/ t
-49 6774.88+ v9 `* A1 N% V2 H% R! p
-48 6298.61. t4 n5 M M& {. S! K
-47 5859.17
8 k" q* l$ Q! C, m b' y$ T-46 5453.45
~: z4 ~4 L9 G+ q6 U! l1 b-45 5078.667 G# d2 t% [2 ]9 ]+ ]
-44 4732.22, B! o9 n( E( ?- G; O) T- g
-43 4411.8, j4 l. ^2 }& w8 f# o7 J2 r
-42 4115.28
& A* l- E* T1 Z1 B d+ R, s-41 3840.72
" ]: m) |* Q/ D' w4 i-40 3586.35
, X2 V" G( d- n$ Y! s1 X: l: O, d-39 3350.55
" Q, G8 w/ w0 h: d3 l+ K+ m: D" Q-38 3131.85
: N) A5 E( R: `2 e1 P-37 2928.9$ y8 w4 b/ y' @$ b6 D2 P U
-36 2740.46. N! w- Z, n# r/ q& x5 `
-35 2565.4
/ p: A' K4 c, b- p6 |8 L/ d-34 2402.69
4 f+ A1 W( X" o7 z) m' g0 c-33 2251.37: p1 e V" f: b% @ s
-32 2110.58
7 F# u' n/ u/ I( v-31 1979.52# j8 s( q; ~7 m) d( ~$ Q
-30 1857.46- c' ` T8 L0 L' o( [3 D
-29 1743.72
7 C' m3 t! I8 W2 v. J-28 1637.68
7 f) `8 A7 Q$ A& q$ E6 j* v-27 1538.77
) t8 [/ w' j* z/ q-26 1446.47# F% d/ j5 X4 l9 l- C1 G9 c2 j/ _
-25 1360.3
5 e0 p* w9 ~" D$ B3 O-24 1279.82
+ j1 V; |! X2 L; @" W. n; Q" q-23 1204.61$ B. U# p' |8 ?, k
-22 1134.29
- u3 g( j# S% R-21 1068.52! l8 J; c: l$ b: |7 T' K
-20 1006.98
; r3 r; F7 ^) x g-19 949.368' T- M/ [6 ]5 ]) @0 J! O- ]
-18 895.411) h0 ~; w% g, Z1 v1 O
-17 844.856# g1 ]6 ~. F& E
-16 797.467
$ `+ p# {3 u$ q4 I( o% e4 ]-15 753.028
- i+ K2 t% H& ]; C0 X5 B. w-14 711.338
' S4 e# i# w& U. ~1 R-13 672.211
" q: ]! ^3 g7 Z8 y$ u-12 635.474
7 d( R# Q- h% d-11 600.967
$ n+ }3 a6 a' d$ u7 c- E+ ~1 a-10 568.543$ n" i- m+ n1 S
-9 538.063
8 ?. D6 k0 |, b+ z% i6 {, N. M. { P-8 509.4: G# o+ v; t( o a
-7 482.435
+ Q8 ?) ?( Q$ b-6 457.057
0 w' d9 r' b+ p2 I- s% Y9 n-5 433.1650 n3 l( l) l! J2 s4 d
-4 410.663) @' r6 k$ s. {; n
-3 389.462
: |+ x0 N( p z `! c-2 369.479& e2 g$ `! @" D+ A" Q# o5 a9 F
-1 350.639
( \$ p5 \# Q4 {1 p6 }1 Y* H5 p0 332.8681 @4 O* h9 @9 w
1 316.102
( Z( J! e8 c3 w* j+ f2 300.276$ r# ]7 ?0 J1 `
3 285.334
, }3 I! {; G- `; s4 271.2216 ]* n' a. w) y9 o! \
5 257.886
: a U* V: ]' t8 a$ v; _4 D0 a8 R6 245.283
- T3 w$ c) M! z; { E" ~7 233.367
4 O7 Q9 }. a) j9 T9 Z: d8 222.098
, \2 H9 [; }( r* e9 211.435
1 P( l: C2 |$ d( E/ h6 b10 201.345$ n" o# _7 W& @- A
11 191.792
- T; F$ h5 e; d/ N8 D12 182.746
5 H6 a2 W/ O2 D( K2 r/ Q( u13 174.1761 \# F* P6 m7 N( M3 e
14 166.056
- H3 [8 V. i, M+ e C0 u15 158.3599 {0 o( Y) ]0 A1 A" O
16 151.06) ]" b2 P; S2 z$ i+ x
17 144.138, h9 E( y. p" i2 W
18 137.571
( R0 Z$ G4 {5 e5 m19 131.339
7 c; [: e% l- \0 U: y+ I20 125.4237 V$ o/ v( {, @$ g1 c: n
21 119.805
+ @# P/ W. q' ]" N. l1 v22 114.4691 g' D% D& _; P( E) N
23 109.399
' P$ D+ B9 N; W b$ F& k24 104.581 _: w n3 a8 P# R1 r, d5 U5 z3 _- P9 Q
25 100
/ k6 V4 X6 N ?26 95.6443
, {7 u8 i" Z2 }" K( u0 v27 91.50136 p! z# w% D( x: s
28 87.5596
: ]/ m: w' d# I9 i" j29 83.8083" w' r( {% {4 x
30 80.2372) O% u# D9 c. e
31 76.837
8 a; ~& n1 m Z6 V0 u32 73.5984
3 u3 w/ x V5 }( C33 70.51316 J u1 e3 J) F* t
34 67.573
" O m m$ _6 t; L* y35 64.7706- J2 B" p; B& S& g. v# X
36 62.0987
+ i6 o" Y: t2 D7 ^0 n3 Q37 59.55073 m, @/ f: k& u: w4 v& ]5 F& X0 I6 n! n }
38 57.1202
6 i% v+ W: S" o4 U39 54.8011
8 v: B1 _ L) U: t ?) W40 52.588
% G5 H0 j9 S4 ]# W; q7 i41 50.4753/ `& ]' v: T+ h
42 48.45816 z& n" n6 i3 S8 t+ z
43 46.5316
) X' q( n S1 [& A3 G: q44 44.6913
- A$ ^# Y+ q! [4 @45 42.933
/ W: b6 ]% u, G/ @6 d, J7 r+ E$ M46 41.2525
* j7 ~" ~, v; h- T! y47 47.3965( \ ? h8 A) A G2 y0 W( C) _
48 38.119 }! y) ~2 W; ~4 ?9 D
49 36.64117 Y, j0 U9 W- u! F6 D
50 35.236
1 I- P3 N8 D8 a7 L. K9 R7 v! }) O51 33.8916
( t) L. V0 K: E+ O( f; P- c- M52 32.605
# E; n' W& w9 q" R- ~* @53 31.3734- v# E. `! B* b6 B7 Q; H
54 30.1944
3 I+ V0 Y2 I* Z% T' ]7 g8 `7 A* m, L55 29.06536 \+ W% G# ]* W4 ^ k
56 27.9839: L' h2 j# Q. i
57 26.9478$ D0 @6 c" d+ o& d5 ?- b
58 25.9551) q& r @( Q. Z2 g8 H
59 25.0036
" B$ q7 l" }( {; i% v! l60 24.0915
& e! M2 |8 m5 m; e, g; f, S61 23.217
( { E3 a% p9 }9 o2 F7 o* N r62 22.3784 z3 _. r- F# ^$ X. }
63 21.574
" D0 K/ B! s' c' ^7 l2 A64 20.80229 i3 t$ Y6 S5 i6 f/ g
65 20.0617
/ o9 k* F9 J, Y+ v66 19.351
/ c& \+ u2 E$ o: I67 18.6687, v! Z4 n1 h2 F0 H: I* O- b' L" W
68 18.0137* _7 c' R' d: t6 b+ y
69 17.38470 D) `! k, M/ x" a2 j. T
70 16.7805- ]% L+ D6 ^% g6 a! E1 T
71 16.20017 n f1 R, ?8 X
72 15.6424
1 ^' u4 J8 o4 Y2 X1 ~73 15.1064
5 p7 x/ x, O8 `# l3 y2 @5 |; f74 14.5913- y9 H) n+ S. d4 r0 v* m
75 14.096+ f" n5 H6 O: z* ~4 J
76 13.6198
' Y7 m0 _+ y$ o77 13.1618' m' j4 b1 ?( g
78 12.7213; l, ^/ E& o! I% J( t
79 12.29756 N. D3 p8 j; O. i
80 11.8897
& K0 C: V2 j$ P% A81 11.4972
: W4 K2 c* ?/ o' y' M' d2 _4 k9 G82 11.1195
0 W2 z8 c( {; @0 Y' A: _: y83 10.75581 i6 u( u. j: N) T6 b: J) m9 B
84 10.4056
. i* s. n" p/ N85 10.0684
5 ]( ?1 H: `5 W86 9.74358 Q. S9 N) q- N1 H: a+ P& k- v! _
87 9.4306( Z) c$ v9 Y* k7 ?
88 9.1291
1 N% U8 H* v0 P. j' k89 8.8385
0 Y5 J3 E3 F4 T7 a9 b1 Y90 8.5585
9 S' B( j; H& d' E# h91 8.2885
3 C+ g# D! L8 e+ M/ M" A92 8.0283
% w1 i E, L+ o* I( c- l2 E93 7.7773
0 s% C B' z2 \4 g- V. K# {! E! K& n94 7.5352 M/ y9 W" `* ~
95 7.30172 z! u& r& `" Z% M7 O
96 7.0764
+ O. _8 s6 ?& {+ c. W97 6.8591
( J# M" y% @! M98 6.6493
' p" D v% N! D& \5 V2 E99 6.4469( u; _( [; c: P; m9 o
100 6.2515% [; k% o7 B% z I) @- w
101 6.0628& S7 v3 N! t. a$ z! x
102 5.8806
3 \8 p) r$ Y7 p6 P) \* y. j9 J* P103 5.7046/ C/ T( z3 |! S% x( o/ o( c: ]
104 5.5347
' u* Y8 E5 O" v$ y" G2 U105 5.3705
" ` A' b9 D& g* H106 5.2119' d$ ^( s8 b$ T2 t6 q8 D; e
107 5.0586/ \/ X2 |: ^. ^( w% m6 ?% e
108 4.9104
$ c' x3 P5 n2 h109 4.7672" @; Y! R' d" H7 p3 O
110 4.6288
4 w( ]- ?+ J' a1 X% b( p111 4.495
7 L- n$ M4 u* s D112 4.3655
2 U$ {1 @9 m( i( B113 4.2404
' \+ ~! L9 V- J0 Q( h# d114 4.11939 D+ {+ f5 |6 x0 B
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