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| How Reed Switches Work |
http://www.explainthatstuff.com/howreedswitcheswork.html |
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| Sparkfun: Reed Switch Hookup Guide |
https://learn.sparkfun.com/tutorials/reed-switch-hookup-guide |
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| Low Power Door/Window Sensor |
https://iot-playground.com/blog/2-uncategorised/10-low-power-door-window-sensor |
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| Monitor Your Door Using Magnetic Reed Switch and Arduino |
http://randomnerdtutorials.com/monitor-your-door-using-magnetic-reed-switch-and-arduino/ |
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| How to Use a Magnetic Door Switch / Sensor With Arduino |
http://www.instructables.com/id/How-to-Use-a-Magnetic-Door-Switch-Sensor-With-Ardu/ |