Prusarduino - Fire protection for 3D printers

myminifactory

Hi Friends, When I first entered the world of 3D printing, I wondered if these little machines were safe? After all, it's a heating system (very powerful though) surrounded by plastic parts, and sometimes even enclosed in a wooden box. So, I searched online. You can find everything on the internet, but to be honest, accidents reported with 3D printers are extremely rare. Anyway, having a system that would shut down the power of the printer when smoke or high temperature was detected could be a great idea. I searched online again and couldn't find any easy solution for a beginner like me. Except on this page: http://mkme.org/forum/viewtopic.php?f=2&t=706. The solution is Arduino! These little boards are perfect to build up a full sensing system, that could power on and off a printer through a relay. It's what they've done. I have to thank the MKme Lab for this very nice starting point. However, it didn't work out of the box when I used their code. So, I decided to go over it and try to make an easy solution for beginners. Here is my version. It uses: An Arduino Leonardo board A DHT11 temperature (and humidity) sensor A MQ2 smoke detector (be careful! It doesn't detect flames, as you can see on the attached video) A 5V relay A power supply for the Arduino board with a switch (around 20€) I also designed a case for all the modules to be clipped on the printer. You'll find here the .stl files, and among them the Arduino code to use on the board. The instructions to understand the code and do the wires connection are in comment inside the code. You can also use the pictures to help you. Here is also a video to show what it does: https://youtu.be/ErFAudwb-2c Here is the code to download and use on your Arduino board: https://mega.nz/#!P4AQFC4B!E6qpQEt6qj-EUvyfUfu0LUyLiTVxFKOP2XMpyOzIKnY (MyMiniFactory doesn't accept .ino files sadly) I'll try to upgrade everything as soon as I can. If you find an error in the code, or have any question, please let me know. Happy printing! EDIT: 10/11/2018: I updated the .ino file for the arduino board. There were a few mistakes in the previous one that I corrected. I re-tested everything and it works fine now!! P.S. If you like the design, please consider a small tip. It would help me buy PLA to test my designs