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I want to create a circuit that has a delay timer so that it turns on after a certain amount of time, say 5 minutes. I have the timer dial from an old oven which is rated for mains voltage and turns the power on for the duration it is set for, then turns the power off. Can I just connect this to a relay so that when the timer turns off the relay switches the power to the other circuit on? Would this work or have I missed something important?
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>>1240969
It sounds ok if the relay has a normally closed contact which means it is closed when power is removed from the coil.
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An old washer machine is run this way, a clock motor turns a cam that pushes switches on and off. Follow their lead.
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The downside to that is you're going to have to reset the timer every time. This would be REALLY easy to do this with a microprocessor though. A program that waits for an input signal from a button) to then run a 5 minute timer and send a signal out to a relay would be really easy to do.
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>>1241009
>This would be REALLY easy to do this with a microprocessor though.
This is promising. If any arduino artists have a sketch in their sketchbook that they can share that encompasses this sort of functionality please make a pastebin for us. Thanks!
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>>1241009
I'm going to use this for setting a delay to a vibration burglar alarm. At the moment it has no delay so it goes off every time I leave the house. Turning a dial before I leave is no trouble for me.
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>>1241027
might cobble something out of a mechanical bathroom fan timer. Though those are closed till they expire. Might reverse that or use the short as a shunt for your sensor.
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>>1241009
>This would be REALLY easy to do this with a microprocessor though
FFS use a 555
https://en.wikipedia.org/wiki/555_timer_IC
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