電路圖
500) {this.resized=true; this.width=500; this.alt='這是一張縮略圖，點擊可放大。\n按住CTRL，滾動鼠標滾輪可自由縮放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/61/163911199263730.jpg');}" onmousewheel="return imgzoom(this);">

以下是程序,編程器用的是微都自動測試設備工作室的WD_PP20編程器(PIC,AVR兩用+實驗板).編譯器是CCS.

///////////////////////////////////////////////////////////////////////
//Filename: tsensor.c                                                //
//Revision: A                                                        //
//Creator: LourenceGuo                                               //
//Created Date: 2007-12-31                                           //
//                                                                   //
//Function:                                                          //
//This is a program to display the temperature w/ 5s bklight function//
//When open the machine, display:    Welcome !                       //
//                                Microchip MCU                   //
//Then display: Temperature:                                         //
//              XXXX Cdegree                                         //
//                                                                   //
//I/O and peripheral equipment:                                      //
//Temperature sensor: LM61, T=(V-500mV)/10                           //
//ADC PIN: AN1                                                       //
//AN0,AN1 ANALOG; A3 REF                                             //
//backlight control: B0                                              //
//LCD: 16PIN 1602LCD w/ backlight                                    //
///////////////////////////////////////////////////////////////////////


#include <16F873A.h>
#device ADC=10
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=20000000)

#include "lcd.c"

float ad_value;
signed int ad_result;

int16 bk_light_counter=0;
int1 bk_light_flag=1;



#define PSW_KEY input(PIN_C0)
#define UP_KEY input(PIN_C1)
#define DOWN_KEY input(PIN_C2)

#define BK_LIGHT PIN_B0


void init();
void temp_ad();
void display();
void key_detection();


//============================================================================================================
#INT_TIMER1
void clock1_isr()
{
   set_timer1(0x3CAF);         // Interrupt every (0xFFFF-0x3CAF) * 0.2us = 50000 * 0.2us = 10ms

   // back light couter
   // ----------------------------------------------------------------------------
   if((bk_light_flag == 1) && (bk_light_counter < 500)) bk_light_counter ++;  // about 5 second
   else if(bk_light_counter==500)
      {
         output_low(BK_LIGHT);        // turn off back light
         bk_light_flag = 0;         // reset back light flag
      }
}
//============================================================================================================


//Detect any key press down
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
void key_detection()
{
   if((PSW_KEY==0)||(UP_KEY==0)||(DOWN_KEY==0))
   {
      output_high(BK_LIGHT);
      bk_light_flag=1;
      bk_light_counter=0;
   }
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////



//Initialize the LCD panel
//*************************************************************************************************************
void init()
{
   setup_adc_ports(RA0_RA1_ANALOG_RA3_REF);         // A0 A1 Ref=A3 for 16F873A, now Vref = 3.3V
   setup_adc(ADC_CLOCK_INTERNAL);

   setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);      // setup interrupt timer1

   enable_interrupts(INT_TIMER1);      // Turn on interrupt timer1
   enable_interrupts(GLOBAL);          // Enabled all interruptions.

   output_high(BK_LIGHT);
   lcd_init();                         // Initialize lcd
   delay_ms(10);
   lcd_gotoxy( 1, 1);                  // go to the start position of the first line
   lcd_putc ("    Welcome !   ");      // display string in the first line
   delay_ms(1);
   lcd_gotoxy( 1, 2);                  // go to the start position of the second line
   lcd_putc (" Microchip MCU  ");      // display string in the second line

   delay_ms(2000);

}
//**************************************************************************************************************


// read temperature A/D data, AN1
// temperature calculator expression is: (ad_vaule(mv) - 500) / 10
void temp_ad()
{
      int8 tt;
      int16 ad_data ;
      {
         ad_data = 0;
         for(tt=0;tt<5;tt++)
         {
            set_adc_channel(1);                 //AN1
            delay_us(10);                       //Delay is need to wait A/D conversion over
            ad_data = ad_data + read_adc();     //add 5 times
         }

         ad_value = ad_data * 0.66;              // 3.3 / 5times
         ad_value = ad_value / 1.024;
         ad_value = (ad_value - 500) / 10;
         ad_result = ad_value;
       }

}

//display temprature value on the LCD
//////////////////////////////////////////////////////////////////////////////////////
void display()
{
  delay_ms(10);
  lcd_gotoxy( 1, 1);                      // go to the start position of the first line
  lcd_putc ("\fTemperature:    \n");      // \f--clear display,\n--go to start position of second line
  delay_ms(1);
  lcd_putc ("     Cdgree     ");
  delay_ms(1);

  lcd_gotoxy( 1, 2);                     // go to the start position of the second line
  lcd_putf (ad_result,4);                // display the temperature value, 4 digital

  //lcd_gotoxy( 1, 2);
  //lcd_putf (0xb7,1);

  delay_ms(1000);
}

//////////////////////////////////////////////////////////////////////////////////////


void main() {

  init();
  do
    {
      key_detection();
      temp_ad();
      display();
    }while(true);
}

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