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HSM-20S Relative Humidity Temperature Sensor Demo

 
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sshahryiar



Joined: 05 May 2010
Posts: 92
Location: Dhaka, Bangladesh

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HSM-20S Relative Humidity Temperature Sensor Demo
PostPosted: Sun Nov 23, 2014 10:10 am     Reply with quote

Code:

#include <16F877A.h>

               
#device *= 16
#device ADC = 10


#fuses NOWDT, PROTECT, CPD, NOLVP, HS
#fuses NOBROWNOUT, NODEBUG, NOWRT, PUT

                                                                                                     
#use delay (clock = 10MHz)


#include "lcd.c" 


const unsigned char symbol[8] = {0x00 ,0x0E, 0x0A ,0x0E, 0x00, 0x00, 0x00, 0x00};

             
void setup();
void lcd_symbols();
void get_parameters(float *relative_humidity, float *temperature);
       

void main() 
{                                                   
   float t = 0;
   float rh = 0;
   
   setup();
                                                                          
                                                            
   while(TRUE)           
   {                        
      get_parameters(&rh, &t);   
      lcd_gotoxy(9, 1);
      printf(lcd_putc, "%3.2g  ", rh);   
      lcd_gotoxy(9, 2);
      printf(lcd_putc, "%3.2g  ", t);
   };                       



void setup()
{                                                                                               
   disable_interrupts(global);             
   setup_timer_0(T0_internal);
   setup_timer_1(T1_disabled);
   setup_timer_2(T2_disabled, 255, 1);
   set_timer0(0);
   set_timer1(0);
   set_timer2(0);                                                           
   setup_CCP1(CCP_off);
   setup_CCP2(CCP_off);
   setup_psp(PSP_disabled);                               
   setup_comparator(NC_NC_NC_NC);
   setup_SPI(SPI_disabled);                   
   port_B_pullups(FALSE); 
   setup_ADC(ADC_clock_internal);
   set_analog_pins(AN0_AN1_AN3); 
   lcd_init();
   lcd_symbols();
   lcd_putc("\f");     
   lcd_gotoxy(3, 1);         
   lcd_putc("RH/%:");
   lcd_gotoxy(3, 2); 
   lcd_putc("T/ C:"); 
   lcd_gotoxy(5, 2);
   lcd_putc(0);
}


void lcd_symbols()
{
   unsigned char s = 0;
   
   lcd_send_byte(0, 0x40);
   for(s = 0; s < 8; s++)       
   {                           
        lcd_send_byte(1, symbol[s]);         
   }
   lcd_send_byte(0, 0x80);
}   
           
                           
void get_parameters(float *relative_humidity, float *temperature) 
{
   unsigned long samples = 256;   
   
   register unsigned long long avg_rh = 0;
   register unsigned long long avg_t = 0;                   
   
   while(samples > 0)
   {                         
      set_ADC_channel(0);         
      delay_ms(1);     
      read_adc(adc_start_only);                                                                   
      while(adc_done() == 0);               
      avg_rh += read_adc(adc_read_only);                                     
      
      set_ADC_channel(1);
      delay_ms(1);     
      read_adc(adc_start_only);                     
      while(adc_done() == 0);               
      avg_t += read_adc(adc_read_only);
      
      samples--;                         
   };
   
   avg_rh >>= 8;
   avg_t >>= 8;
   
   *relative_humidity = ((0.1507 * avg_rh) - 11.4378);
   *temperature = ((-0.0002 * avg_t * avg_t) + (avg_t * 0.2268) - 11.4945);
}   

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