Code:
tmp1 var byte
tmp2 var byte
Temperature Var Word ' Temperature storage
TempC Var Word
Float Var Word
TargetTemp Var Word ' Desired Temperature
Hyst Var Word ' Hystereris
V Var Word ' Var. for display
B1 Var Byte ' Byte for TargetTemp calculation
B2 Var Byte ' Byte for TargetTemp calculation
Count_Remain Var Byte ' Count remaining
Count_Per_C Var Byte ' Count per degree C
Sign Var Byte ' +/- sign
Mode Var Byte ' 0=Temp. display, 1=Set Temp, 2=Set Hysteresis
Twist Var Bit
'*****************************************************************************
' Resolution
'*****************************************************************************
DS18B20_9bit CON %00011111 ' 93.75ms, 0.5°C
DS18B20_10bit CON %00111111 ' 187.5ms, 0.25°C <-- My favorite
DS18B20_11bit CON %01011111 ' 375ms, 0.125°C
DS18B20_12bit CON %01111111 ' 750ms, 0.0625°C (default)
DATA 46, 224, 20 ' Temp MSB, TEMP LSB, Hysteresis DIV 10
Mode=0 ' Temperature display mode
Twist = 0
PAUSE 500
LCDOUT $FE, 1, $FE, $0C ' Clear display, cursor off
PAUSE 250
OWOUT DQ, 1, [$CC, $4E, 0, 0, DS18B20_10bit] 'Skip ROM search and write N_bits
' resolution to scratch pad
Read 0, B1 ' Read TargetTemp MSB
Read 1, B2 ' Read TargetTemp LSB
TargetTemp=B1*256+B2 ' Calculate TargetTemp value (Default=20.0 C.)
Read 2, B1 ' Read Hysteresis
Hyst=10*B1 ' Calculate Hysteresis value (Default= 2.0 C.)
'-------------------------------------------------------------------------------
MainLoop:
If Mode_B=0 then ' Mode switch pressed
Pause 50 ' Debounce
LcdOut $FE, $8F, "*" ' Show that command is accepted
If Mode_B=0 then MainLoop ' Wait until button is released
Mode=Mode+1 ' Increment mode
If Mode=1 then ' Save Target Temperature (Mode1 -> Mode2)
Write 0, TargetTemp / 256 ' TargetTemp MSB
Write 1, TargetTemp MOD 256 ' TargetTemp LSB
EndIf
If Mode > 1 Then ' Save Hysteresis (Mode 2 -> Mode 0)
Mode=0 ' Only 0, 1, 2 are valid
Write 2, Hyst / 10 ' Divide Hyst value to fit in Byte
EndIf
EndIf
If Mode =0 then ' Set Target Temperature
LcdOut $FE, $80, "Set Temp. " ' Show function
V=TargetTemp ' TargetTemp in V
Gosub SelectSign ' Select +/blank/-
Gosub DisplayTemp ' Display Target Temperature
If (UP_B=0) Or (DOWN_B=0) then ' Up or Down button pushed
If DOWN_B=0 then ' Down button
If TargetTemp > 7500 then ' Not lower than -25 C. (10000-MinTemp * 100)
TargetTemp=TargetTemp-25 ' Decrease temperuture with 0.25 C.
EndIf
EndIf
If UP_B=0 then ' Up button
If TargetTemp < 17500 then ' Not higher than 75 C. (10000+MaxTemp * 100)
TargetTemp=TargetTemp+25 ' Increase temperature with 0.25 C.
EndIf
EndIf
GoSub SetTargetTemp ' Display TargetTemp and delay 0.25 Sec.
EndIf
EndIf
If Mode=1 then ' Set Hysteresis
LcdOut $FE, $80, "Hysteresys: " ' Show function
Sign= " " ' No sign
V= 10000+Hyst ' Set value for V
Gosub DisplayTemp ' Display Hysteresis
If (UP_B=0) Or (DOWN_B=0) then ' Up or down button pushed
Sign= " " ' No sign for Hysteresis
If DOWN_B=0 then ' Down button
If Hyst > 10 then Hyst=Hyst-10 ' Not less than 0.1 C.
EndIf
If UP_B=0 then ' Up button
If Hyst < 1000 then Hyst=Hyst+10 ' Not more than 10.0 C.
EndIf
V= 10000+Hyst ' Set value for V
Gosub DisplayTemp ' Display Hysteresis
Pause 250 ' Delay 0.25 Sec.
EndIf
EndIf
if Mode > 0 then Mainloop ' Setting TargetTemperature or Hysteresis
goto mainloop ' Check again
'-------------------------------------------------------------------------------
' SUBROUTINES:
'----------------------------------------
SelectSign:
If v = 10000 then ' Temperature = 0 C.
Sign=" " ' No sign
Else
If v < 10000 then ' <> 0
Sign="-" ' Temperature below 0 C.
Else
Sign="+" ' Temperature above 0 C.
EndIf
EndIf
Return
'----------------------------------------
DisplayTemp:
If V >= 10000 then ' Above 0 C.
Temperature=V-10000
Else
Temperature=10000-V ' Below 0 C.
EndIf
LcdOut $FE, $C0, Sign, DEC (Temperature / 100), ".", DEC2 Temperature, " ",223,"C "
Return
'-----------------------------------------
SetTargetTemp:
V=TargetTemp
Gosub SelectSign
Gosub DisplayTemp
Pause 250
Return
Code for thermostat with 18b20
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