Switched smoke alarm for workshop. LED off indicates smoke alarm is active.

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LED flashing on indicates smoke alarm is deactivated.

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It can get a bit smoky in my workshop!

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Wiring.

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Schematic file below.

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Materials:
1 x Switch: 1A, spdt (single pole, double throw)
1 x Flashing blue LED: 10mm, 15mA, 3.2v
1 x 10mm LED holder/bezel
1 x Resistor: 470ohms, 1/4W
Wire: 7/0.2mm 
Small heatshrink tubing

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knoba – Workshop Smoke Alarm Schematic – 2018.fzz

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