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Old 06-06-2010, 01:14 PM   #1
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How would I make this device (electronic question)


My dryer does not have a buzzer when it stops, and it takes me a whole day to do laundry just because it might sit doing nothing for an hour or two before I remember to go check, or realize that time has gone by.

I was thinking of making some kind of device that I put near the wire, it would pickup some electricity through induction when the dryer is running, and not pickup any when it's stopped. What I'd want to do is have it charge a capacitor with this energy (or it can be a button I hold that uses a battery, if it's easier). It would not do anything as long as there is current going though the dryer's power cord. When this current stops, this device would start beeping loudly until the capacitor charge is dead.

Would something like this be easy to make? Basically it could use the same concept as a clamp on meter.
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Old 06-06-2010, 01:32 PM   #2
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Cost!


I had a dryer with that built in still forgot it all the time, this is probably more trouble after the fact. Why not a small clip on timer just set it when you start the dryer. A current probe would do it but by the the time you connected it to a relay with power and a buzzer it could turn into a real project. Some of the small timers even have a clip you could put in your pocket or a magnet to stick on the dryer.
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Old 06-06-2010, 01:45 PM   #3
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Hmm never thought of attaching an electrode to the knob. I just remembered I have this 12 volt buzzer somewhere, it's very loud, I could probably hook it up to a capacitor bank and when the probe touches it goes off for a few seconds. Then when I go downstairs I would just press a button to charge the capacitors or something. Or I could hook it directly to a power source but then it would not stop until I get down, could get annoying. Or maybe it could power an electric motor that slowly moves another electrode away. Some possibilities here.
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Old 06-06-2010, 02:01 PM   #4
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You could get crazy, maybe a hall effect device strapped to the power cord?
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Old 06-06-2010, 02:43 PM   #5
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Put on one of those dog training collars. Set the controller so the dryer knob hits the button when the timer runs out..... Or you could just put a $2 kitchen timer in your pocket.
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Old 06-06-2010, 03:11 PM   #6
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When the Dryer times out the Dryer sound times out.
Get a $20 Baby Monitor- comes with a belt clip


http://www.amazon.com/Safety-1st-Cry...5854317&sr=8-4
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Old 06-06-2010, 03:47 PM   #7
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Quote:
Originally Posted by DaleBelcher2 View Post
You could get crazy, maybe a hall effect device strapped to the power cord?
Yes this is what I was thinking of, I did not know there was a name for it, I just said induction. Basically, when there's current going by I don't want it to do anything, when the current stops, I want it to do something, for a predetermined amount of time. This is where the capacitor comes in, as it will drain out making the sound stop. I already have a high powered 12v alarm I can use. It runs fine on lower voltages too, just not as loud. It's like 150db so I don't really need or want to run it on 12 volts.

A timer won't quite work as the dryer senses when it's dry so it does not always stop at the same time. The baby monitor is not a bad idea though.
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