Step 6: Reassembly

To run the extra signal and ground wire, I cut a small square notch from the lip of the base plastic piece and secured it with hot melt glue, after zip-tying the two wires together.  Hot glue was reapplied to secure the battery clip.

And that's it!  You now have a battery powered smoke sensor for your next home automation, science project, or DIY security system!

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