Hi all
Long long time since I had to think of this, I need to drive a 5v DC relay on for around 30 secs, then off momentarily, then on for another 30 secs, just using a single momentary push button to start the sequence.
I want to use TTL high to drive the relay through a ULN2803A. That part is no problem, nor is using something like a 555 timer circuit to produce an on period of around 30 secs, (plus or minus 5secs, it's not critical) but am getting boggled working out how to get two 30 sec on periods with a short break (say 200 to 1000ms) between the on periods from one momentary pushbutton press.
I also need to use another pushbutton to only do one 30 sec (ish) on timing period for the same relay.
Any thoughts?
Thanks
Christopher
Long long time since I had to think of this, I need to drive a 5v DC relay on for around 30 secs, then off momentarily, then on for another 30 secs, just using a single momentary push button to start the sequence.
I want to use TTL high to drive the relay through a ULN2803A. That part is no problem, nor is using something like a 555 timer circuit to produce an on period of around 30 secs, (plus or minus 5secs, it's not critical) but am getting boggled working out how to get two 30 sec on periods with a short break (say 200 to 1000ms) between the on periods from one momentary pushbutton press.
I also need to use another pushbutton to only do one 30 sec (ish) on timing period for the same relay.
Any thoughts?
Thanks
Christopher