This video shows how I wired a smoke detector into a relay to disconnect my 3d printer in case of fire.

WARNING - This circuit deals with high voltage (120v - 240v). This work should be done by a qualified person. I take no responsibility for those attempting this circuit, do so at your own risk.

A disconnect controlled by a 3-wire smoke detector. I plan on using this with my 3d printer.

I didn't use the 9v DC output but I'd be interested in an arduino or Raspberry Pi project for it. It could be used to send an SMS or e-mail on trip which would be very useful.

I wanted to show that making this disconnect with the proper parts and without "hacking" a smoke detector was possible. Made with off the shelf parts.

Parts Used:
- Smoke detector: Kidde Direct Wire 120 VAC 3-wire with battery back-up (Model: i12040ACA)
LINK: http://a.co/8ovQEkb

- Relay Module: Kidde SM120X (10a rating at 120v, N/O and N/C contacts as well as 9 VDC output on trip)
LINK: http://a.co/6mAN1ED

- Deep Octagon Box
LINK: http://a.co/g2cmGw1

- 14/3 SOOW Flexible Cord
LINK: http://a.co/eUqFz4E

- 120V/15A Cord ends male and female
LINK: http://a.co/6Z8goN9

- Wire nuts and electrical tape