Automatic Timer for Hot Glue Guns (Re-published #14)



In this project, I build a timer with an acoustic notification if the temperature for gluing is reached. It switches the gun automatically off if not used for 10 minutes.
When off, it uses absolutely no electricity.
The design uses an ATiny85, a solid-state relay and is programmed with the Arduino IDE.
I am a proud Patreon of @GreatScott!, @ElectroBOOM , @Electronoobs , @EEVblog , and others. No Docker, No Microsoft Teams, Zoom

Links:
Design files: https://github.com/SensorsIot/HotGlueGunSwitch
Yellow hot glue gun used: https://s.click.aliexpress.com/e/_AscxG1 and
White hot glue gun: https://s.click.aliexpress.com/e/_AVgnvx
On Amazon: https://www.amazon.com/gp/search/ref=as_li_qf_sp_sr_il_tl?ie=UTF8&tag=andreassspies-20&keywords=hot glue gun&index=aps&camp=1789&creative=9325&linkCode=xm2&linkId=8ffc1b93d09030c73aa1edc61ea78e2e
Omron SSR: https://s.click.aliexpress.com/e/_9hbN5T or https://s.click.aliexpress.com/e/_97SiBL
5V power supply (enclosed version): https://s.click.aliexpress.com/e/_Aql7XR

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28 thoughts on “Automatic Timer for Hot Glue Guns (Re-published #14)

  • July 4, 2021 at 3:22 pm
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    Does your hot melt glue gun have a thermostat or is it thermally balanced? If it has a thermostat it will reach temperature more quickly and live longer as it can use a more powerful element but cycle it to maintain temperature. This is like a temperature controlled soldering iron which might be 70 watt or more and heats in less than 30 seconds, compared to a cheap 20 watt iron that takes several minutes to heat to soldering temperature and will cook its tip while operating as its temperature rises very hot unless actively melting solder.
    If your glue gun has a thermostat then you could add a current sensor to your circuit to detect when the thermostat is cycling power to the heating element. When it starts cycling off for some significant time the gun is up to temperature. With a little tuning of the algorithm it may be possible to detect when the gun is not used and after too long idle, turn it off. (But it would probably be easier to put a little tilt switch on the gun and run wires back down to your circuit.)

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  • July 4, 2021 at 3:22 pm
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    For years now I have used a hot water tank immersion heater timer to switch off all the things that get hot or are potentially dangerous in my lab.
    The timer is connected to a mains extension block, so all devices plugged into this socket are switched off after a preset time.
    The adjustment is from 1 to 180 minutes. As timer, was designed for an immersion water tank heater, it is rated for up to 30 amps at mains voltage. While this is not a true construction project, other than fixing it to a uPVC board and wiring it up, it has been a very useful addition to the lab. All my mains powered soldering irons, heat guns, hot glue guns, etc are switched through this timer.
    One benefit is that it has greatly reducing the number of soldering iron bit replacements needed, as I no longer leave the irons on for long periods by accident.

    The original build for this project was inspired by a near serious accident that happened at a company at which I was working.
    A bench had been left switched on over night, leaving the apparently unused bench soldering iron powered. During a discussion about a particular circuit, the A0 size blue print of the diagram was draped over this apparently vacant bench, and its hot iron. After a many minutes, a brown mark appeared on the blue print, this rapidly turned black and burst into flames, fortunately the flames were quickly extinguished. Had the discussion happened later in the day, the lab might have been vacated before the paper diagram showed any signs of burning, and there would have been no one to promptly put out the fire, with the obvious damaging consequences.
    After that incident, I installed the timer as a safety device in my own home lab.

    Reply
  • July 4, 2021 at 3:22 pm
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    Nothing like the good old state machine to track a process.
    I enjoyed the video, watching it while my 3D printer is making an illuminated smoke hood for soldering.
    I found some rather nice light sources at the China store this morning, been needing to do this for some time.
    And my old worn out 3D printer is becoming an engraver as mechanically it is so well built.
    Enjoy the summer and your holiday activities.
    Kind regards,
    South Africa

    Reply
  • July 4, 2021 at 3:22 pm
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    I use the timer switch of an old microwave for exactly this purpose. Because of the non-linear division, it is very easy to set both short switching times of 1 minute to 10 minutes and long times of up to 1 hour.

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  • July 4, 2021 at 3:22 pm
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    Did this to both my guns and my partners curling iron using a Sonoff Basic Wifi Smart Switch Relay Module with Tasmoto installed. You can't beat it for $5!

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  • July 4, 2021 at 3:22 pm
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    I just put mine on an shelly converted outlet and have home assistant set the timer for me. And of course the as a redundancy using ESPHomes functions as well.

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  • July 4, 2021 at 3:22 pm
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    I really wish someone just built all these features into a real glue gun.

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  • July 4, 2021 at 3:22 pm
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    Funny, I added a foot switch to mine for the same reason with a glowing Neon indicator…
    I am considering adding an 8266 to my solder station that is MQTT enabled, so it can be turned off at specific times or via PIR sensor

    Reply
  • July 4, 2021 at 3:22 pm
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    Of course I remember this one and I like it. Real project video, not only powerpoint. But as we all developed our skills in the meantime, I would say: We want more! I learned from Julian Illet, that you can determine if the glue gun already heated up by current measurement because the heat element is a PTC. No need for hardcoded time constant. Additionally, many soldering irons only lower the temperature for some time and completely switch off after a very long time. This would require some kind of dimming circuit for the gluegun. So, perhaps an idea for another video?

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  • July 4, 2021 at 3:22 pm
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    They really should have a cordless glue gun that has an led to indicate getting up to temp and battery level.

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  • July 4, 2021 at 3:22 pm
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    Neat project. When youโ€™re back from your holiday, how about a remix that would be simpler for others to construct? For example, start with a Sonoff MINIR2 that includes the microcontroller (suitably reprogrammed), power supply, relay and PCB.

    Reply
  • July 4, 2021 at 3:22 pm
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    I need one of these for my soldering iron ๐Ÿ™‚ A warm up timer and a light to indicate it's hot would be great, thanks for the inspiration!

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  • July 4, 2021 at 3:22 pm
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    spotted screwdriver set from aldi at the end of the video. i also have them for many years now, and i absolutely love this set. great value for the money!

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  • July 4, 2021 at 3:22 pm
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    The glue gun timer should be a mandatory safety feature on these devices. While they probably contain a thermal fuse, there is still a fire risk.

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  • July 4, 2021 at 3:22 pm
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    Nice recap project. I have the same issues with my hot glue gun, I often forget to turn it off. So, this might come in handy ๐Ÿ˜‰

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  • July 4, 2021 at 3:22 pm
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    I need to make an lcd tester for nintendo 3ds screens….I would pay hundreds for a prototype…

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  • July 4, 2021 at 3:22 pm
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    Hi Great video, I am interested in how to switch off my 3D printer when its finished printing

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  • July 4, 2021 at 3:22 pm
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    Andreas, with your hands being exposed like that I feel like this video should be age-limited!

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  • July 4, 2021 at 3:22 pm
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    I use enum statement for name states for the state machines, it more readable and easy to add or remove states.

    Reply

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