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Delay timer circuit conundrum

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Ferdmonster

New Member
Being a rank amateur, customizing an off the shelf delay timer relay circuit is perplexing. It seems each circuit I purchase that is programmable has multiple programs, none of which meet my needs. My needs are:

Switch closes and stays closed
Timer starts counting down from 1 hour
If time goes to zero, relay closes
If switch opens before 1 hour, timer resets

I think that's all I need the circuit to do to start with. Eventually I would like to add the ability to send a text message if relay closes after 1 hour.
Right now I'm trying to learn to program Arduino but it doesn't seem my specs can be met by that system, at least so far in my study. Am I heading toward a dead end?
 

alec_t

Well-Known Member
Most Helpful Member
Welcome to ETO!
Does this help?
You could use an Arduino to create a required delay, then an I/O pin could switch a power transistor and hence a relay or other load.
 

Ferdmonster

New Member
Yes it sure helped me understand timed delayed relay functions. Thank you. It's just that I don't know where to study programming of these circuits that will meet my criteria.
 

alec_t

Well-Known Member
Most Helpful Member
Study the Datasheets for particular time delay relays you have, or are considering obtaining. Manufacturers often publish Application Notes too.
 
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