Newbie - 16F628A and switch latching

[peterdeco1]

Hi Malcolm. One suggestion is to make all unused ports as outputs. This helps in noisy environments as electric motors drive PIC's crazy even with a separate supply. Make sure portb.0 is held high with a resistor not too high in value. I once had a small hobby motor drive my PIC crazy until I went down to a 1K resistor as a pullup.

CMCON = 7
TRISA = 0
TRISB = 0 'MAKE ALL OUTPUTS
PORTA = 0
PORTB = 0 'ALL OUTPUTS LOW
INPUT PORTB.0 'RB0 SWITCH INPUT

MAIN:
NAP 0 'REDUCE CURRENT DRAIN ON BATTERY
IF PORTB.0 = 0 THEN CHANGELED 'IF REED SWITCH CLOSED CHANGE LED STATE
GOTO MAIN

CHANGELED:
TOGGLE PORTB.4 'CHANGE LED STATE

WAITFORRELEASE:
PAUSE 1000 'WAIT A SECOND
IF PORTB.0 = 0 THEN WAITFORRELEASE 'WAIT HERE FOR REED TO OPEN
GOTO MAIN

[malc-c]

Hi Peter,

Thanks for the advice and I'll make port A all output as I'm only using port B. Oh and yes the inputs on the switches are tied high via a 10K resistor.

[Acetronics2]

Hi,Malc

Have a look to the " BUTTON " command ...it is really very powerful for such application.

Add a DEFINE BUTTON_PAUSE 200 at the top of your program if you want a debounce time of 200 ms ( max 255 ms ...) ... that's all !

read you soon !!!

Alain

PS; if not already done, download this : http://www.melabs.com/downloads/pbpm304.pdf
THE reference manual !!!
Microcode studio : http://www.melabs.com/downloads/mcs2300.zip

[malc-c]

Hee hee - fancy seeing you here

Yes I have downloaded the manual, and had it open last night whilst I was developing the program, and as manuals go its really good to get newbies like myself up and running.

Must admit, that I'm having more fun (and luck) with PBP than I did with JAL. PBP seems more logical in its commands and the structure of using them.

Alain, let me into a secret, is that Melanie in her avitar... brains as well as beauty - wow !!

[Acetronics2]

Hee hee - fancy seeing you here

Alain, let me into a secret, is that Melanie in her avitar... brains as well as beauty - wow !!

In fact, Mel is some like Charly in the "Charly's girls" TV series ... I do not think anyone on this forum knows her real appearance ...

We only know she says she likes to wear leather clothes at night, and is a bit bored about charming guys hoping to get something from her brain ...

May be she'd love to find a bunch of red roses and some Champagne at her door rather than the New up to date Compiler ....

Talk to her gently, and she'll give you the best from her ...

That's part of what I understood here ... not to break the magic.

Alain

[Melanie]

There are those that have sent boxes of red roses...

...and there are those that have sent boxes of chocolates...

...boxes of diamonds are a little slower in coming - but I'm working on it...

...and there are those that have seen a little more of me than others (I seldom refuse an invite to dinner - especially if you're buying - but can you afford a genuine up-town girl?) *smiles*

...and Yes, that's really me in the avatar... if you're real nice I just might change it for a while to something more sophisticated - but I'm always worried that I'll distract you from your work (or play)...

[mister_e]

... if you're real nice I just might change it for a while to something more sophisticated -

I have a feeling of what it could be Maybe i'm in the 3rd category ... LOL easy to start some rumor here

BTW Melanie, if you change your Avatar to 'something more sophisticated', i feel that some end-of-class student here could be shocked OR spam your PM! May i bet on the second one