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start:
init:
clrf PORTA ; make sure port A output latches are low
bsf STATUS,RP0 ; select memory bank 1
movlw b'11111111' ; set port A data direction to inputs
movwf TRISA
movlw b'00000000' ; set port B data direction to outputs
movwf TRISB
bcf STATUS,RP0 ; select memory bank 0
bsf INTCON, INT0IE
bsf INTCON, GIE
rawtemp EQU B6
countdown EQU B7
movlw 5
movwf countdown
movlw 0
goto main
interrupt:
clrf PORTB ; clear PORTB
goto start ; restarts the program
beep: ; a for loop that beeps a buzzer and turns on a led then sets a led on
; if nothing is done
bsf PORTB, 0 ; put a RED LED on PORTB:0
bsf PORTB, 1 ; put a BUZZER on PORTB:1
call wait1000ms
bcf PORTB, 0
bcf PORTB, 1
call wait1000ms
decfsz countdown, F
goto beep
bsf PORTB, 2 ; put an AMBER LED on PORTB:2
goto start
main: ; reads the temprature
call readadc1 ; put a THERMISTOR on PORTA:1
movf B1, W
movwf rawtemp
call readadc0 ; put a POT on PORTA:0
movf B0, W
subwf rawtemp, w ; subtract the from the threshold value
btfss STATUS, 0 ; if higher than desired temp
goto beep ; ^
clrf STATUS
goto main
END ; ends the program
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