So now I am going to incoporate those calculations into my PIC's firmware and I shall test it when my USB programmer arrives (hopefully in the next couple of hours).
I've got the circuit working well, assuming the AD595's output is linear. However I'm unsure how to go about implementing a lookup table. The only way I can think of doing it is an array of 500 bytes...And thinking about it that wouldn't even work
#define samples 256
signed long temp;
char print;
void readadc(int channel){
temp = 0;
// Take specified number of samples
for(i = 0; i < samples; i++){
temp += Adc_Read(channel);
}
temp /= samples;
temp = (temp * multi) >> 10;
temp -= 1454;
if (temp < 0) LCD_Chr(1,5,'_'); else LCD_Chr(1,5,' '); // Display minus sign if negative temp
print = abs(temp / 1000);
WriteTallNum(print, 6);
print = abs(temp / 100)%10;
WriteTallNum(print, 7);
print = abs(temp / 10)%10;
WriteTallNum(print, 8);
LCD_Chr(2, 9, '.');
print = abs(temp % 10);
WriteTallNum(print, 10);
}int TEMP_TABLE[32] = {-200,-174,-168,-160,-150,-139,...,...,...,..};char short_result = result >> 5; //get whichever 32 step it corresponds to
char result_diff = result - short_result; //how much larger than the 32 is it.
char span = TEMP_TABLE[short_result + 1] - TEMP_TABLE[short_result]; //span between this 32 val and the next.
int temp_diff = (result_diff / 32) * span; //This will not work since result_diff /32, will always return 0, you need to use fixed point or floating point or however you want to implement it. this is for illustration only.
int myTempRightNow = TEMP_TABLE[short_result] + temp_diff; //yayy!!
