این نقشه بلوک دیاگرام مدار

 

این هم نقشه شماتیک مدار

 

زمان جاروب کردن هر LED برابر با ۱۰ میلی ثانیه میباشد

این هم بر نامه ی ای سی میکرو پروسسور مدار می باشد

 

while(1)
{
while(!cputick)
continue;
cputick=0;
print_ADC();
}

The function that reads 12-bit data from ADC is read_ADC(char n). The function has two loops. First loop is to send 4-bit command. And the second loop is 12-bit to shift the data from ADC.

sbit Data = P1^1;
sbit CLK = P1^2;
sbit CS = P1^3;


int read_ADC(char n)
           { int k; 
           char i,channel; 
           k=0;
           CS=0;
           if(n==0) channel=0x0d;
           else channel=0x0f;
 for(i=0;i<4;i++)
           {
           CLK = 0;
           if(channel&8) Data = 1;
           else Data = 0;
           CLK = 1;
           channel <<=1;
           }
           Data = 1;
           CLK = 0;
 for(i=0;i<12;i++)
           {
           k<<=1;
           CLK=1;
           CLK=0; 
           if(Data) k|=1;
           else k&=~1;
           }
           CS = 1;
           return k&=0xfff;
           }

To provide smooth reading, I added the 5-point moving average to the raw data. The function low_pass_filte1( ) is used to filter the high frequency noise. The reading is calibrated to degree Celsius with Platinum 100 standard thermometer. We found the equation y=0.0323x-15.122.

int low_pass_filter1(void)
{
	x5=x4;
	x4=x3;
	x3=x2;
	x2=x1;
	x1=read_ADC(0);
	return(x1+x2+x3+x4+x5)/5;
}
float read_temp1_filter(void)
           {
           return(0.0323*low_pass_filter1()-15.122);
           }

Download

Schematic schematic.pdf
C source code thermistor.c
Orcad Schematic File Uss.dsn
Intel-Hex file thermistor.hex
HIH-3160 Humidity Sensor Datasheet