Prusarduino Nano - Fire Safety System for 3D Printers (evolved)

thingiverse

Hello friends! My goal here was to create a fire safety system that anyone can set up easily, without needing programming skills or Arduino experience. Everything is plug and play, so just print the parts, download the code, load it on the Arduino board, connect the sensors as shown in the code, and you're good to go! The only tricky part is modifying your printer's alimentation wire, but that can be done with a simple cutter. If you want an even more complete system, check out this creation: https://www.thingiverse.com/thing:2432366/files I recently released my old version of Prusarduino (https://www.thingiverse.com/thing:3182258), which I used on my old and great Prusa i3 Hephestos. I just got a fantastic Prusa i3 MK3 (with an heated bed, of course!), so I thought it would be awesome to upgrade the fire detection system to fit this new printer. Here's my latest version. A short video is always better than a long text, so you can see what it does here: https://youtu.be/GDM_EfoJHiU So, basically, it works just like the previous version: if the temperature of the air around the printer goes over 75°C (in this case), or if some smoke is detected, the Arduino board turns off the 5V relay and shuts down the printer power automatically. That way, if anything starts to burn on your printer, electricity will be removed from it to avoid overheating. This new version fits the Lack Enclosure released by Prusa recently! I miniaturized it with an Arduino Nano to make it more affordable. This new system cost me just 10€ on eBay! It's pretty easy to build, and no programming skills are needed - everything is included here. This new version has a better temperature sensing range (-40°C to +80°C), thanks to the DHT22 sensor. It will be more compatible with heated beds. However, be careful if you use it inside an enclosure; it can get really warm in there, and you might accidentally shut off the printer power while printing. It still uses the MQ2 sensor for smoke detection. To control the printer, I chose to directly cut into two the printer alimentation cable and wire it to the relay. This fix doesn't heat up while printing, so no risk there! You'll need these pieces: * MQ2 Smoke Sensor (https://www.ebay.fr/itm/MQ-2-MQ-3-MQ-4-Gas-Sensor-for-Arduino-Raspberry-Pi-Nano-Due-Uno) * DHT22 Temperature and Humidity Sensor (https://www.ebay.fr/itm/DHT22-Temperature-and-Humidity-Sensor-for-Arduino-Raspberry-Pi-Nano-Due-Uno) * 5V Relay Module (https://www.ebay.fr/itm/5V-Relay-Module-for-Arduino-Raspberry-Pi-Nano-Due-Uno) * Arduino Nano Board (https://www.ebay.fr/itm/16M-5V-Mini-USB-Nano-V3-0-ATmega328-Micro-controller-CH340-For-Arduino-Cable) The sensors can be mounted on different circuits depending on where you ordered them. In that case, I'm afraid you'll have to design a new case for them. Refer to my pictures to see the version I used. Useful tricks: * All the instructions concerning the Arduino part are in the .ino file (Arduino script). You'll find how and on which pin to connect the sensors to the Arduino board. * Be careful, the MQ2 sensor can also detect some hairspray. Don't spray it close to your printer, or you won't be able to power it on for a while! * If my sensor cases don't fit perfectly your sensors, you can adjust them slightly using some pads for furniture that you can buy almost anywhere. * I added the .step files for those who want to modify the design. You should be able to open it in Fusion360. I hope you'll like it! Please share some pictures if you make one! Happy printing!! P.S. If you like the design, please consider a small tip. It would help me buy PLA to test my designs!