Reed Switch

Reed+Switch

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There are many ways to open and close a circuit. The most common ways are to use switches and push button switch, but have you heard of a reed switch? The reed switch opens and closes a circuit using a magnet. Reed switches cost around $1 a piece. The link and the video below shows how to create a simple circuit using a reed switch.

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https://learn.sparkfun.com/tutorials/reed-switch-hookup-guide

 

This relates to engineering because you are using technology to make and possibly solve problems in the real world.