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Timed Relay? Answered

i want to make an outlet that turns on with a button and automaticly turns off after about 30 minutes or so. somethimes i forget to turn my soldering iron and hot glue gun off and its not good for either of them to keep them on for long periods of times( or several weeks..) can anyone help?

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-max-

3 years ago

Making one would be a fun project. They aren't too difficult to make, although if you want something reliable, safe, and cheaper, a readymade solution would be better. That said, I don't discourage projects or DIY. A classic 100% analog approach to this might be to take a 555 monostable one-shot timer and configure it to stay on for half an hour once triggered. Large value capacitors tend to be pretty inaccurate and deviate from nominal ratings quite a lot! So that would not be the best approach if you needed accurate timing, but it would work.

You could also use a microcontroller that would do the same thing. A microcontroller could allow you to have more flexibility to add different sensors (such as the classic PIR motion sensors) to detect when you are around and using the iron, and when you leave to turn things off.

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-max--max-

Answer 3 years ago

Just make sure if you build one, you make sure to make it safe. Use 3 terminal grounded plugs, heatshrink on exposed wiring, make sure to keep good clearance and creepage distance between high voltage AC stuff and the low voltage stuff, use appropriate fuse protection.

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iceng

3 years ago

Use the lights... Add an outlet that is the same as your lights power... This guarantees your solder iron is off when the lights are turned off...

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Wired_Misticeng

Answer 3 years ago

+1

I did something similar for my bench. Grabbed a power bar and mounted it to the wall, then all my heat based tools are plugged into there. Soldering Iron, Heat gun, Hot glue gun, ect. then also plugged my work lights into the power bar as well.

That way when I shut the shop down for the night, and turn off the main lights, I will see my work bench illuminated and go turn off the equipment.

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rickharris

3 years ago

You can buy such a switch made for corridor lights.

OR use a regular timer you plug in a socket and set for the time you want.