Humidity and Temperature Measurement with PIC16F877A using HSM-20G

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/*******************************************************************************
*                 Program For "HSM-20G Reading for Humidity and Temp."         *
*                    Program Written By_Engr. Mithun K. Das                    *
*                       MCU: PIC16F877A; X-Tal: 8MHz(Ex.)                      *
*                           Email: [email]mithun060@gmail.com[/email]                         *
*                               Call: 01722448270                              *
*                                 Date:06-08-14                                *
*******************************************************************************/
// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
 
sbit LCD_RS_Direction at TRISB2_bit;
 sbit LCD_EN_Direction at TRISB3_bit;
 sbit LCD_D4_Direction at TRISB4_bit;
 sbit LCD_D5_Direction at TRISB5_bit;
 sbit LCD_D6_Direction at TRISB6_bit;
 sbit LCD_D7_Direction at TRISB7_bit;
 // End LCD module connections
 
unsigned int Humidity = 0;
 unsigned int Temperature = 0;
 long adc_rd = 0;
 
void Get_Humidity(void);
 void Get_Temperature(void);
 
void main()
 {
 TRISA = 0xFF;//all input
 ADCON1 = 0x00;//all analog
 
// LCD Initialization...
 Lcd_Init();
 Lcd_Cmd(_LCD_CLEAR);//clear LCD
 Lcd_Cmd(_LCD_CURSOR_OFF);//Cusros Off
 Lcd_Out(1,1,"HSM-20G Hum_Tmp.");
 while(1)
 {
 Get_Humidity(void);
 Get_Temperature(void);
 }//while...(1)
 }//void main
 
/*******************************************************************************
 **********************         Get_Humidity         ****************************
 *******************************************************************************/
 void Get_Humidity(void)
 {
 char hum[] = "RH:  %";
 int ii;
 float voltage = 00.00;
 ADCON0 = 0b00010001;// Select Channel 2
 adc_rd = 0; //Clear Previous Data
 for(ii=0;ii<20;ii++)
 {
 adc_rd += ADC_Read(2);  //Take sample and add
 }
 adc_rd /= 20;// Get the average data
 voltage = adc_rd*0.004883;// 5/1023
 Humidity = (int)((3.71 * voltage * voltage * voltage) - (20.65 * voltage * voltage) + (64.81 * voltage) - 27.44);
 hum[3] = Humidity/10 + 48;
 hum[4] = Humidity%10 +48;
 Lcd_Out(2,1,hum);
 }
 /*******************************************************************************
 **********************         Get_Temperature        **************************
 *******************************************************************************/
 void Get_Temperature(void)
 {
 char Tmp[] = "Temp:   C";
 int jj;
 float voltage = 00.00;
 ADCON0 = 0b00011001;// Select Channel 3
 adc_rd = 0; //Clear Previous Data
 for(jj=0;jj<20;jj++)
 {
 adc_rd += ADC_Read(3);  //Take sample and add
 }
 adc_rd /= 20;// Get the average data
 voltage = adc_rd*0.004883;// 5/1023
 Temperature = (int)((5.26 * voltage * voltage * voltage) - (27.34 * voltage * voltage) + (68.87 * voltage) - 17.81);
 Tmp[5] = Temperature /10 + 48;
 Tmp[6] = Temperature %10 +48;
 Tmp[7] = 223;
 Lcd_Out(2,8,Tmp);
 }
 
/*******************************************************************************
 **********************       End Of The Program     ****************************
 *******************************************************************************/