Include "modedefs.bas" @ Device PIC16F877,XT_OSC,WDT_off,PWRT_off,PROTECT_off ,BOD_Off define adc_bits 8 define osc 4 DEFINE LCD_DREG PORTD DEFINE LCD_DBIT 4 DEFINE LCD_RSREG PORTD DEFINE LCD_RSBIT 1 DEFINE LCD_EREG PORTD DEFINE LCD_EBIT 0 low portD.2 trisa = $ff trisb = $00 TRISD = $00 adcon1 = 7 temperature VAR WORD count_remain VAR BYTE count_per_c VAR BYTE sV var byte PV var byte mode var porta.0 up var porta.1 down var porta.2 DQ VAR PORTA.3 ' One-wire data pin heater VAR PORTB.0 High heater sV = 25 LCDOut $fe, 1," TEMPS SENSOR " LCDOut $fe, $c0,"DS1820 1WIRE BUS" pause 2000 main: gosub read_pv gosub calculate gosub display read 0,sv if mode = 0 then pause 200 : gosub set_temp pause 10 GoTo main End read_pv: OWOut DQ, 1,[$CC, $44] loop: OWIn DQ, 4, [count_remain] IF count_remain = 0 Then loop OWOut DQ, 1, [$CC, $BE] OWIn DQ, 0, [temperature.LOWBYTE, temperature.HIGHBYTE, Skip 4, count_remain, count_per_c] temperature = (((temperature >> 1) * 100) - 25) + (((count_per_c - count_remain) * 100) / count_per_c) LCDOut $fe, 1, DEC (temperature / 100), ".", DEC2 temperature, " C" PV = (temperature / 100) return calculate: If (PV >= (SV - 1/2)) then gosub display write 0,sv high heater 'off heater Pause 100 endif If (PV < sV ) then gosub display write 0,sv low heater 'on heater Pause 100 endif return display: LCDOut $fe, 1,"PV=", DEC (temperature / 100)+1,"C" LCDOut $fe, $c0,"SV=" ,dec SV,"C" pause 10 return set_temp: LCDOut $fe, 1,"settemp " pause 2000 LCDOut $fe, 1 pause 1000 loop2: if mode = 1 then IF (Up=0)THEN PAUSE 100 SV = SV+1 IF (SV>=100)THEN SV = 100 write 0,sv ENDIF IF(DOWn=0)THEN PAUSE 100 SV = Sv-1 IF(SV<=0)THEN SV = 0 write 0,sv ENDIF pause 100 LCDOut $fe, 1,"setpoint temp " LCDOut $fe, $c0,"SV=", dec SV,"C" goto loop2 endif pause 100 goto main RETURN
