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How to generate 2hours pulse with 555 timer

S

Saeed Anwar

Jan 1, 1970
0
i want to drive a 5V relay such that it is on for 2 hours and off for 10 seconds
again on for 2 hours and off for 10 seconds and this process continue. how this
can be implemented with 555 timer.
 
R

Robert Baer

Jan 1, 1970
0
Saeed said:
i want to drive a 5V relay such that it is on for 2 hours and off for 10 seconds
again on for 2 hours and off for 10 seconds and this process continue. how this
can be implemented with 555 timer.

Use multiple timers; one to do seconds as the timebase, which triggers
a 10 second timer (giving the 10 second timer better stability and
accuracy), and also triggers a 30 second timer (same reasons).
Then have the 30 second timer trigger a 15 minute timer (same
reasons), and that one trigger the 2 hour timer (same reasons).
This does help, but for a decent 2 hour time delay, the better way to
go is to clock a binary divider.
 
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