PIC16F84 ile programlanabilir şifreli kilit devresi

Devre şeması;

piccodelock.bas yazılımı;'****************************************************************
'* Name : CodeLock.bas *
'* Author : F. San *
'* Date : 18.12.2003 *
'* Version : 1.0 *
'* Notes : Programable Code Lock with the PIC-16F84 *
'****************************************************************

@ device xt_osc, wdt_off, pwrt_on, protect_off

'**************************************************
RL1_ON_time con 1000 * 3 'sec. Relay ON time
'**************************************************

TrisA = 0 ' PORTA, all outputs
PortA = 16 ' turn off Buzer
OPTION_REG.7 = 0 ' PORTB Pullups.
TrisB = 110000 ' PORTB.0-3 outputs, 4-7 inputs
PortB = 0

LD1 var PortA.2
RL1 var PortA.3
BUZ var portA.4
cnt var byte

key var byte
col var byte
row var byte
keycnt var byte
pwOK var bit

keybuf var byte[15]
pwbuf var byte[4]

EEPROM 0,[1,2,3,4] 'Default password 1,2,3,4 programmed at EEprom location 0..3
Read 0, pwbuf[0] 'Copy password from EEprom address 0..3 in to pwbuf[0..3]
Read 1, pwbuf[1]
Read 2, pwbuf[2]
Read 3, pwbuf[3]

pwOK = 0
keycnt = 0

Main:
high ld1
gosub Chk_KEYPAD
pause 1
goto Main

Chk_KEYPAD:
for row = 0 to 3
PORTB = (dcd row) ^ $f
pause 1
col = PORTB >> 4
if (col <> $f) then 'key pressed
key = (row * 3) (ncd (col ^ $f))
gosub Got_KEY
key = 255
endif
next
return

Beep:
low ld1
low buz
pause 40
high buz
return

Got_KEY:
gosub Beep
while (PORTB >> 4) <> $f
pause 1
wend
if key = 11 then key = 0
keybuf[keycnt] = key
gosub Chk_keycnt
return

Chk_PwOK:
PwOK = 0
if (keybuf[0] = pwbuf[0]) and (keybuf[1] = pwbuf[1]) and (keybuf[2] = pwbuf[2]) and (keybuf[3] = pwbuf[3]) then pwok = 1
return

Chk_NewPwOK:
PwOK = 0
if (keybuf[5] = keybuf[10]) and (keybuf[6] = keybuf[11]) and (keybuf[7] = keybuf[12]) and (keybuf[8] = keybuf[13]) then pwok = 1
return

Pw_Change:
pwbuf[0] = keybuf[5]
pwbuf[1] = keybuf[6]
pwbuf[2] = keybuf[7]
pwbuf[3] = keybuf[8]
Write 0, pwbuf[0] 'Store new password to EEprom location 0..3
Write 1, pwbuf[1]
Write 2, pwbuf[2]
Write 3, pwbuf[3]
return

Chk_keycnt:
select case keycnt
case 4
gosub Chk_PwOK
if pwOK then
if keybuf[keycnt] = 12 then Access_OK
if keybuf[keycnt] <> 10 then Clr_keybuf
gosub Beep
else
goto Clr_keybuf
endif
case 9
if keybuf[keycnt] <> 12 then Clr_keybuf
gosub Beep
case 14
if keybuf[keycnt] <> 12 then Clr_keybuf
gosub Beep
gosub Chk_NewPwOK
if pwOK then
gosub Beep
gosub Pw_Change
gosub Beep
goto Clr_keybuf
else
goto Clr_keybuf
endif
case else
if keybuf[keycnt] = 12 then Clr_keybuf
end select
keycnt = keycnt 1
return

Access_OK:
High RL1
pause RL1_ON_time
low RL1

Clr_keybuf:
for cnt = 0 to 14
keybuf[cnt] = cnt
next
keycnt = 0
goto Main

end