Re: coutdown 555 timer values?

On 22 Jul 2005 14:01:01 -0700, "aman" <aman.bindra@xxxxxxxxx> wrote:

>You might want to consider a simple 8 bit microcontroller like PIC. All
>micro-controllers have timer interrupts. If not using a CD4017 as a
>counter and using 555 to generate a 30 sec pulse seems like a good idea.

---
It may seem like it is, but in reality it isn't.

Note that the OP wanted six timeout periods all starting at once, but
as they timed out, each one lasting 30 seconds longer than the one
which timed out before it. Like this:

___
T1___| |__________________________________________

______
T2___| |_______________________________________

_________
T3___| |____________________________________

____________
T4___| |_________________________________

_______________
T5___| |______________________________

__________________
T6___| |___________________________


You can't do that with a 4017.

--
John Fields
Professional Circuit Designer
.

Relevant Pages

  • Re: coutdown 555 timer values?
    ... You might want to consider a simple 8 bit microcontroller like PIC. ... micro-controllers have timer interrupts. ... Prev by Date: ...
    (sci.electronics.basics)
  • Re: coutdown 555 timer values?
    ... John Fields wrote: ... >>You might want to consider a simple 8 bit microcontroller like PIC. ... >>micro-controllers have timer interrupts. ...
    (sci.electronics.basics)
  • Re: coutdown 555 timer values?
    ... John Fields wrote: ... micro-controllers have timer interrupts. ... If not using a CD4017 as a counter and using 555 to generate a 30 sec pulse seems like a good idea. ...
    (sci.electronics.basics)
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