Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
BEGIN CLRF PORTB
WAITHI BTFSS PORTA,0
GOTO WAITHI
CLRF TMR0 ;START TMR0
TESTST BTFSC PORTA,0
GOTO TESTST
MOVF TMR0,W ;READ TMR0 INTO W
SUBLW .148
BTFSC STATUS,CARRY
GOTO WAITHI
i'm using a 4Mhz cystal and the prescaler is 1:1
do anyone know how to calculate the value for...
Re: BURGLAR ALARM
yeah, this is wat i wan but i dunno which register or instruction can act like counter to count 3 times then alert the alarm..........can u give me some idea?
but anyway, thxs for the comment
Re: BURGLAR ALARM
i 'm using ASM language to construct the design.
yeah, my keypad is function properly and the transmitter and receiver also work properly. But then i wish to enhance the design with adding an alarm. when ever the user key-in password wrongly more than 3 times then it will...
Re: BURGLAR ALARM
so far i have design an infrared circuit by microcontroller PIC16F877
the circuit consists of a remote control to transmit data to the receiver side
then, the receiver receive data to check whether the key-in password is correct o not
if correct then it will give a sigal to...
I WOULD LIKE TO DESIGN A BURGLAR ALARM FOR MY PROJECT
THE SPECIFICATION IS WHEN THE USER KEY-IN THE WRONG PASSWORD FOR 3 TIMES THEN THE ALARM WILL ALERT
IS THERE ANYONE HAVE AN IDEA TAT USE PIC16F877 TO COUNT FOR 3 TIMES ( USER KEY-IN WRONG PASSWORD) THEN GIVE A SIGNAL TO ALERT THE ALARM?
i'm doing a receiver and then the 1 is 5ms while 0 is stand for 2.5ms
do anyone know how to differentiate a 2.5ms cycle and 5ms cyle???
i actually got an idea that set a constant, the above two value subtract a value of 3 ms so tat i'm able to know whether is 2.5ms or 5 ms
but how to create a...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
