Eric Williams shared on YouTube:
How to make a DIY Arduino safety shutoff for any device such as a 3D printer.
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This project uses a simple Arduino NANO to control any device via a relay. In this case I am using it to shut off power to my 3D printer in case of over temperature or smoke detected.
In an upcoming version I will add high temp detection which I can attach directly to the extruder area. Do NOT parallel this up with you existing temperature sensor- the time you need this is when the existing one has gone bad and the extruder is in a thermal-runaway condition 🙂
You can add any other sensor you wish. Just make sure your relay is capable of handling the current your 3D printer requires (most are not a huge requirement and simple relays will suffice)
You do NOT need to switch the A/C side of your printer- go ahead and switch the output from your power supply (the DC side) and it will be even easier. The amperage requirements for the relay will be the same on both sides but switching the low voltage side is always nicer. I showed it this way so people could adapt this system for any A/C device easily (or if your printer does not have easy access to anything but the AC plug)
You can find the code and discussion here: http://mkme.org/forum/viewtopic.php?f=2&t=706
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