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How to make an All in One Detector

Step 11Give yourself a pat on the back

Give yourself a pat on the back
Good work. This device should now work properly. If you want, you can install a longer cable going to the reed switch, so you can monitor your bedroom window, or whatever.

Another thing you can do to make it an arm/disarm system-
Wire a switch between the reed switch and the heat sensor. That way, when the switch is off, it will not sound no matter what the condition of the reed switch.
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Author:willbill808