Smoke detector - Savety shut down Printer

thingiverse

This is a project for every printer and every printer should have it. Also this here is more about the project then for the printing parts. I read some stories the printer burns down or the electric burned out. To try to avoid a bigger damage as the printers most of the time are in action without supervision, it's just a question of security to have a smoke detector on it. This version is low cost and not too difficult to build - even for beginners. Of course there are many stuff on it what can get improved (electric and programming). This was just a quick project, but it still works fine. What does it do: - there are smoke detectors on two side (ANET A8). One for the power supply and the other for the electric main parts - if one of these detects smoke it cuts of the main power supply with a relay. - the 9V battery keeps the detectors and the display running and shows an alarm. - there is also a stopwatch on it for personal use as you want (measure the time of printing for example). - to reset an alarm, you need to reset the complete detector What do you need: - 1 Arduino (I used an Arduino Nano) - 2 smoke detectors MQ02 (with analog out -> 4 pins) - 1 dual-relay or two single relays for Arduino (5V) - 1 DC-DC converter 12V to 5V or adjustable - 1 OLED-Display 128x64 I2C (I used a 1.3" OLED-Display) - 1 cheap simple ordinary Diode (I used a N4005 - as I have them at home) - 1 push-button - 1 battery between 7V and 24V (I used a 9V block battery) - breadboard for soldering - few cables - soldering iron - Mini-USB cable - Arduino studio (https://www.arduino.cc/en/Main/Software) Note - if you turn it on after a long off time, it can happen your detectors will detect a high percentage of smoke and go on Alarm and after slowly down. That’s not your fault if it happens. just wait until it is under 40% and reset the detector/Arduino - it's easily possible to add a siren on it - you can use the main power by using the other contactor of the relay or add another output inside the software