購買了一個ADC0831就試著編寫程序，讀取電壓值正確。使用NTC（3950 10K）顯示溫度，但是在轉換阻值與查表卻無法編寫出正確的程序，經多次實驗還是無法寫出程序,實屬無奈還請大神不吝賜教，給予文獻作為參考不勝感激！！！單片機使用；STC89C52;
#include <reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
sbit SCK = P1^0; //11腳數據時鐘
sbit RCK = P1^1; //12腳輸出時鐘
sbit SI = P1^2; //14腳數據
sbit CS=P1^3; //ADC片選信號
sbit CLK=P1^4; //ADC時鐘信號
sbit DO=P1^5; //ADC數據接口
unsigned int NTC_R;//定義熱敏電阻阻值變量
unsigned char code segmcode[]={
0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90 //共陰極數碼管段碼0-9
};
unsigned int code Ttable[106][2]={//溫度與電阻阻值對應關系表格
0,3274,//0度對應阻值32.74k
1,3111,//1度對應阻值31.11k
2,2957,//2度對應阻值29.57k
3,2812,//
4,2674,//
5,2545,
6,2422,
7,2306,
8,2196,
9,2092,
10,1993,
11,1900,
12,1811,
13,1728,
14,1648,
15,1573,
16,1501,
17,1433,
18,1369,
19,1308,
20,1250,
21,1194,
22,1142,
23,1092,
24,1045,
25,1000,//25度對應阻值10k
26,957,//26度對應阻值9.57k
27,916,
28,877,
29,840,
30,805,
31,771,
32,739,
33,709,
34,679,
35,652,
36,625,
37,600,
38,576,
39,553,
40,531,
41,510,
42,490,
43,471,
44,453,
45,435,
46,418,
47,402,
48,387,
49,372,
50,358,
51,345,
52,332,
53,320,
54,308,
55,297,
56,286,
57,276,
58,266,
59,256,
60,247,
61,238,
62,230,
63,222,
64,214,
65,207,
66,199,
67,193,
68,186,
69,180,
70,174,
71,168,
72,162,
73,157,
74, 152,
75, 147,
76, 142,
77, 137,
78, 133,
79, 128,
80, 124,
81, 120,
82, 116,
83, 113,
84, 109,
85, 106,
86, 102,//86度對應阻值1.02k
87, 99,//87度對應阻值0.99k
88, 96,
89, 93,
90, 90,
91, 88,
92, 85,
93, 82,
94, 80,
95, 78,
96, 75,
97, 73,
98, 71,
99, 69,
100,67,
101,65,
102,63,
103,61,
104,59,
105,58//105度對應阻值0.58k
};
unsigned char data bitcode[4]={0,0,0,0}; //數碼管顯示位置 1-4
unsigned int date,i;
void hc595(uchar num)
{
uchar i;
for(i=0;i<8;i++)
{
SI=(num<<i)&0x80;
SCK=0;
_nop_();
SCK=1;
SCK=0;
}
RCK=0;
_nop_();
RCK=1;
RCK=0;
}
unsigned char ad_conv(void){
unsigned char i,com;
CS=1;
CLK=0; _nop_(); _nop_();
CS=0; _nop_(); _nop_();//CS置低，啟動轉換
CLK=1; _nop_(); _nop_();
CLK=0; _nop_(); _nop_();//第一個下降沿，準備輸出數據
CLK=1; _nop_(); _nop_();
for(i=8;i>0;i--){
CLK=1; //第二至九個下降沿
_nop_();
_nop_();
com<<=1;//左移，先采最高位
if(DO)com++;//采當前數據
CLK=0;
_nop_();
_nop_();
}
CS=1;
_nop_();
_nop_();
return com;
}
//數碼管顯：
void display()
{
static uchar i=0;
bitcode[0]=segmcode[date/100] ;
bitcode[1]=segmcode[date%100/10];
bitcode[2]=segmcode[date%10];
P0=0xFF;
hc595(0x01<<i);
P0=bitcode[i];
i++;
i%=3;
}
void main(void)
{
uchar i = 0;
while(1)
{
i++;
if(i==100)
{
i=0;
date=ad_conv()*100;
date=date/51;
}
display(); //顯示
}
}
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