In message , Andrew Gabriel
writes
In article ,
Steve writes:
geoff wrote:


A microcontroller just to give you a 2 minute delay - bit of an overkill
isn't it ?

Cheap enough these days, and about 30 seconds of programming effort. Why
ponce about with 555 timers (flaky at long delays) ?

Low power 555's handle minutes without problems, but this application
probably only really needs around 10 seconds, and it doesn't need to
be accurate.



The commercial ones use shift registers (40154?)

There is no such thing as 30 seconds of programming

--
geoff