关于计算器：
基本上，这个计算器是用来计算铜线和铝线在环境温度下的电阻，使用公式 R2= R1*(1+alpha(T-25))
这里 R2 是输出，R1 是用户使用 4x4 矩阵键盘输入的值（包括十进制值，如 12.5 等），T 是温度传感器 LM35 记录的摄氏温度。铜的 alpha = 0.0039 铝的 alpha = 0.0042
它应该如何工作：
基本上，温度将由计算器记录，该计算器将给出输入 T。用户使用键盘输入 25 摄氏度时的电阻值。现在是键 0-9 和“。” 用于输入值。此后，当用户在键盘上按“+”时，它应该执行铜的公式并在 LCD 上显示结果，同样，当用户按“-”时，它应该执行铝的公式。让我们暂时将“*”“/”和“=”按钮留作备用。
目前进展：
使用我在此附件中发送给您的代码，我能够正确地在屏幕上获得温度，我能够看到 R1 的值（即 25 摄氏度时的电阻值）现在我不知道如何使用这些值来获得输出。
请帮我解决一下这个。:)
谢谢和问候， Mohit Goyal
#define F_CPU 1000000UL
#include <avr/io.h>
#include <stdio.h>
#include <stdlib.h>
#include <util/delay.h>
#include "lcd.h"
#include "lcd.c"
#include <math.h>
#define KB_PORT_OUT PORTB
#define KB_PORT_IN PINB
void port_init(void)
{
DDRB = 0x0f; //Key-board port, higer nibble - input, lower nibble - output
PORTB = 0xff;
}
void init_devices(void)
{
port_init();
MCUCR = 0x00;
TIMSK = 0x00; //timer interrupt sources
}
void InitADC()
{
ADMUX=(1<<REFS0);
ADCSRA=(1<<ADEN)|(1<<ADPS1)|(1<<ADPS0);
}
uint16_t ReadADC (uint8_t ch)
{
ch=ch&0b00000111;
ADMUX|=ch;
ADCSRA|=(1<<ADSC);
while (! (ADCSRA & (1<<ADIF)));
ADCSRA|=(1<<ADIF);
return (ADC);
}
void Wait ()
{
uint8_t i;
for (i=0;i<1;i++)
_delay_loop_2(0);
}
void main()
{
char Temp[3];
uint16_t adc_result,mV;
int t;
lcd_init (LCD_DISP_ON);
lcd_clrscr();
InitADC();
lcd_gotoxy(0,0);
lcd_puts("R1=");
lcd_gotoxy(9,0);
lcd_puts(",T=");
lcd_gotoxy(15,0);
lcd_puts("C");
lcd_gotoxy(0,1);
lcd_puts("R2=");
while(1)
{
adc_result=ReadADC(0);
mV=(int)(1000.0*5.0*(((float)adc_result)/1023.0));
t=(int)(mV/10);
sprintf(Temp,"%d",t);
lcd_gotoxy(12,0);
lcd_puts(Temp);
Wait();
unsigned char Res, upperNibble, myCharPointer, keyCode, keyPressed, j;
int a=0, b=0, c=0, d=0, display=0;
init_devices();
lcd_gotoxy(3,0);
while(1)
{
upperNibble = 0xff;
for(j=0; j<4; j++)
{
_delay_ms(1);
KB_PORT_OUT = ~(0x01 << j);
_delay_ms(1); //delay for port o/p settling
upperNibble = KB_PORT_IN | 0x0f;
if (upperNibble != 0xff)
{
_delay_ms(20); //key debouncing delay
upperNibble = KB_PORT_IN | 0x0f;
if(upperNibble == 0xff) goto OUT;
keyCode = (upperNibble & 0xf0) | (0x0f & ~(0x01 << j));
while (upperNibble != 0xff)
upperNibble = KB_PORT_IN | 0x0f;
_delay_ms(20); //key debouncing delay
switch (keyCode) //generating key characetr to display on LCD
{
case (0xee): keyPressed = "1";
a=1;
b=b*10+1;
break;
case (0xed): keyPressed = "4";
a=4;
b=b*10+4;
break;
case (0xeb): keyPressed = "7";
a=7;
b=b*10+7;
break;
case (0xe7): keyPressed = ".";
break;
case (0xde): keyPressed = "2";
a=2;
b=b*10+2;
break;
case (0xdd): keyPressed = "5";
a=5;
b=b*10+5;
break;
case (0xdb): keyPressed = "8";
a=8;
b=b*10+8;
break;
case (0xd7): keyPressed = "0";
a=0;
b=b*10+0;
break;
case (0xbe): keyPressed = "3";
a=3;
b=b*10+3;
break;
case (0xbd): keyPressed = "6";
a=6;
b=b*10+6;
break;
case (0xbb): keyPressed = "9";
a=9;
b=b*10+9;
break;
case (0xb7): keyPressed = "=";
break;
case (0x7e): keyPressed = "A";
break;
case (0x7d): keyPressed = "B";
break;
case (0x7b): keyPressed = "C";
break;
case (0x77): keyPressed = "D";
break;
default : keyPressed = "X";
}//end of switch
lcd_puts(keyPressed);
lcd_gotoxy(3,1);
lcd_puts(keyPressed);
OUT:;
}//end of if
}//end of for
}//end of while(1)
return 0;
}
}