芯片解密NTC10K温度计
- 芯片解密//硬件：STC15W408AS+3位共阴数码管+1个10K的电阻（最好选用精密电阻）+NTC10K热敏电阻
- 芯片解密//晶振选12M或11.0952M
- /*原理：NTC 10k热敏电阻和10k精密电阻串联接入VCC—GND，利用单片机内部的ADC
- 模块测出NTC电阻上分的电压ADC_V以及系统的供电电压POWER_V，从而得到10k精密电阻上
- 的电压R_V=(POWER_V-ADC_V)，根据电阻串联电流相等可以知道NTC电阻中的电流I=R_V/10K,
- ，再根据U=I*R可得到热敏电阻的阻值NTC_R=ADC_V/I,通过查表找出此阻值对应的温度。*/
- #include <STC15W.h>//STC15W408AS头文件
- #include <intrins.h>
- unsigned int NTC_R;//定义热敏电阻阻值变量
- unsigned char temperature;//定义温度存储变量
- unsigned int code Ttable[106][2]={//温度与电阻阻值对应关系表格
- 0,3274,//0度对应阻值32.74k
- 1,3111,//1度对应阻值31.11k
- 2,2957,//2度对应阻值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度对应阻值10k
- 26,957,//26度对应阻值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度对应阻值1.02k
- 87, 99,//87度对应阻值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度对应阻值0.58k
-
- };
- #include<4LED_YIN.H>//数码管驱动显示程序
- #include <BandGap.H>//包含读单片机内部BandGap基准电压值
- void T_dis(){//温度处理函数采集到的阻值与二维数组的阻值进行比较，从而获得相对应的温度值。
- unsigned char i;
- for(i=105;i<106;i--) {
- if(NTC_R >= Ttable[i][1] && NTC_R < Ttable[i-1][1]){
- temperature=(Ttable[i][0]+1);
- break;
- }
- }
- }
- /********************************/
- void main (void)
- { Delay20ms();//待系统稳定
- InitADC();//初始化ADC
- P1M1=0X80;//P1.7高阻输入
- init();//IO口设置初始化
- while (1)
- {
- ShowResult(7);//测量NTC热敏电阻上的电压并根据电压计算出阻值
- T_dis();//测量到的阻值进行查表对比找到阻值对应的温度值
- disp(); //数码管显示温度值
- }
- }
芯片解密
