Timer PIC16F57

[Acetronics2]

Hi, leonel

At each interrupt, you increment ( or easier decrement !!! ) a counter ...which (inc) rements another counter if the first overflows ... which ( inc ) rements ...

etc. etc.

Permits to do something else during blinking ... ( isn't it Dwayne ??? )

can be done with PBP or directly with assembler ... ( No, ... i didn't tell it ... my doctor said: no shock on the head, ... )

Alain

PS : No interrupt ... so you poll for TMR0 overflow !!!

[Dwayne]

Hello Alain,

Alain >>Permits to do something else during blinking ... ( isn't it Dwayne ??? )<<

Don't know <smile>. Simple program to blink a light?

With change of Chips? With no info on the final project, With no intended purpose but to blink a light, and "Simple example"? I can only assume a Blinky Light...Hopefully He will have it running, and if the info we gave him doesn't pan out, He can give us more info, so that we can become a little more detailed <g>.

Like What Ralph posted on the FAQ...

Need chip #, Code, details, Projects purpose, and other things.
I rememeber a while back, a person asked to change a 4 (separate) byte Hex to Decimal...I gave him the code, then his example had 5 (separate) bytes coming in, and he wondered why it didn't give him the right answer<g>.

Dwayne

[leonel]

Using pause command i don´t see if any other input. What i want is put my output high during 20s but at the same time see if other input goes high. If it goes high i will start over again, my time goes to 0s, and i will start counting 20s

[Acetronics2]

Hi, leonel ...

Don't shout at me but I did something like that with a resettable 555 and some CD4000 logic ... it was in one of my prior lives.

Said honestly, the 16F57 is not really the best Choice here ...

Alain

[leonel]

Yes, i know that´s not the best choice, but it´s what i have i know that with some logic i can do that, but i have 8 inputs and mixing all together i will need "some CD4000" and i have space problems (in my box i have to put 8 relays, and all electronic...), that´s why i want to use a cheaper PIC...

[Acetronics2]

Your project looks like a quizz box ...

20 second to answer ... who's the quickest of 8 !!!

we REALLY need to know a lot more about your top secret weapon. ...

if you really want help, of course

Alain

[Dwayne]

Hello Loenel,

How accurate does it have to be on blinking every 20 seconds?
We now have concluded that there is muching going on, thus, it is not just a simple "Blink" a light.

1. How long of a pause is allowed?

For example: Untested... but the idea is there...

  Counter1 var word
  Counter2 Var word
  Loop:
  Counter1=0
  Counter2=0
  Loop2:
   if Counter1< 20
     if Counter2 <1000
         Pause 1  'Pause 1/1000 of a second
         CheckButtons....
         Do stuff...
         CheckButtons....
         Do Stuff
            if CheckButtons==Pushed then goto Loop
         Counter2=Counter2+1;
     Endif
     
     if(Counter2>=1000)
       Counter1=Counter1+1;
       counter2=0;
     endif
   endif
   if Counter1<20 goto Loop2

  Blink light = on
  Pause 200  'pause 1/5 of a second to light up the light.
  Blink Light = off
  goto Loop:

Granted, this is a "oversimplification" of code. But it is a generic program that will allow lights to be blinked and still scan keys once ever 1/1000 of a second (with the exception of a blinky light.

[leonel]

Ok, i'll explain my secret weapon
I have 8 buttons that will control relays. One button corresponds to one relay. If it´is pressed i turn on the relay and stays on for 20s or 40s (depending the position of a switch). If one button is pressed while one relay is on the time goes to begin and the two relays stays on again 20s or 40s. On led is on if one relay is on...
Here´s my secret weapon
It was simple if i was using PIC16F872 (that´s the PIC i know better...)
My pulse it´s 200ms and the time it´s not critical (if i have 17s instead 20s that´s ok)