Returning whole numbers for DS1820?

[Darrel Taylor]

Oops, I should have looked closer. Didn't see you're using the extended resolution. That routine was for .5 deg resolution.

OK, so when the temp drops below 32°F, it means that the °C is going negative. And negative values can't be multiplied or divided in PBP. So the "extended Resolution" formula gives the wrong answer.

Same problem with the Fahrenheit conversion, And the LCDOUT statements.

Here's what I think should work...(untested)

After reading the DS1820, change the second half of Update_Pond_Temperature: to this...

    ' Calculate Water_Temp in degrees C to 2 decimal places 
     Sign = Water_Temp.15
     Water_Temp = ((ABS(Water_Temp) >> 1) * 100)
     if Sign then Water_Temp = -Water_Temp
     Water_Temp = Water_Temp - 25 _
                     + (((count_per_c - count_remain) * 100) / count_per_c)

  IF Temp_Displayed = Celsius then RETURN

 'IF the Temp_Displayed = Fahrenheit then Convert C to F before returning   
  
     Sign = Water_Temp.15
     Water_Temp = (ABS(Water_Temp) */ 461)
     if Sign then Water_Temp = -Water_Temp
     Water_Temp = Water_Temp + 3200
RETURN

Then change the lcd routine to this...

Print_To_2nd_Line_Of_Lcd:
   LCDOut $fe, $c0
   IF Its = Dark THEN
       LCDOUT 1
   else 
       LCDOUT 2
   endif
   LCDOut "H2o = "
   if Water_Temp.15 then LCDOut "-"
   Water_Temp = ABS(Water_Temp)
   LCDOut DEC Water_Temp / 100,".",DEC2 Water_Temp,0
   IF Temp_Displayed = Fahrenheit then
       LCDOut "F "
   else
       lcdout "C "
   endif
   IF Its <> Dark THEN
       lcdout DEC Lite_Level
   endif
RETURN

You don't need the Temp_Convert include file.

HTH,

[jessey]

Hi Darrel,

Looks like I owe you some more beer, your code works excellent. My Pond Pump Controller circuit works great now. Really appreciated.

Thanks
jessey

[Darrel Taylor]

Woohoo! It's like Beer in the bank.

Now I just need to find a local Branch office so I can make a withdrawl.

__________________
DT

P.S. That's gotta be one COLD pond in B.C. in February.
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