Search found 19 matches

Thank you all for wasting your time with my problem ..

For software rtc you mean this ?

https://www.ccsinfo.com/forum/viewtopic.php?t=26177

Can I use it with any pic ? Can I use the inte ...

thank you

I see another rtc DS3231, could you advise to use it ?

Regards

hi,

I changed the crystal and the delay decreased to (5-6) SEC/DAY.

Is there a software method to correct the drift?

Thank you for your appreciated effort.

regards Smile

hi,

I'm trying to use ds1307.

I'm using pic 16f877a and the following code and library.

https://www.ccsinfo.com/forum/viewtopic.php?t=23255

The problem was after 24 hours i see delay abou ...

Thank you for useful information guys Smile

I appreciate your effort ^^

Could the mclr pin connection cause a similar problem ?
and what is the recommended connection for it ?

Smile

Hi,

Would be better to use the unused pins of mcu as i/p or o/p ?
or, should leave them unconnected ?

regards Smile

Exactly.

However it is important how your TRIS is being used. The code here relies on the keyboard bits being set as inputs. They will be provided you don't use a port wide output. You talk about o ...

You have fiddled with the code without understanding it.

kbd is already defined as a variable to _input_ from the keyboard. That is what the #byte is doing.
In this line:
kbd = input_b()&0x0 ...

hi,

i modified kbd_getc as the following

char kbd_getc(void)
{
static int1 kbd_down = FALSE;
static char last_key = '\0';
BYTE kchar;
BYTE row;

byte RDio=0;

...

Hi all ^_^

I tried to use pins rb4-rb7 as output.
I modified the kbd_1row as the following:

#if defined use_portb_kbd
#byte kbd = getenv("SFR:PORTB")
#else
#by ...

Looks good to me, nice clean square edges, which is what you want.

The proof is pressing all the keys and confirm it works in the 'Real World'.

I use external 10K resistors only because some I/O ...

Thank you guys Smile

I tested the keypad using scope using only pull-up resistors tied to 5V
the signal was as in the following:

http://www.3rbz.com/uploads/thumbs/ba5dcbef255c1.jpg

Wou ...

Thank you all for your appreciated effort ^^

No. The posted code has software debouncing. Look at the line
that has a 10 ms delay. That's the software debouncing.

.

Is the 10 m ...

One thing you have to remember is to call the kbd function often .
Unlike an interrupt driven keyboard routine, this one is 'polled' so that whatever you do in main() has to call it often otherwise t ...

Thanks a lot PCM for your appreciated effort Smile

Is it necessary to hardware debounce the buttons ?