Smoke Alarm Shutdown - Multiple Inputs

I liked Henry Arnold's 3D Printer Safety Shutdown system, but I wanted to use multiple smoke detectors in my two-level enclosure. This remix includes a printed circuit board to add multiple inputs to the system.

I designed a PCB that replaces the in-line diodes. The PCB is very simple and uses 8 diodes for 8 possible inputs to the shutoff relay. The PCB uses screw terminals to attach the input and output wires, and is fastened with M3 screws.

I designed the PCB in KiCad, and submitted the