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I have a Pi 2 and I would like to monitor the state of 3 magnetic switches. All of them are in close distance, no more than 3m of cabling for each one of them. How can I connect them to monitor their current state (open/closed)? The reed switches are Uxcell MC-38's:

https://www.amazon.com/uxcell-Window-Sensor-Magnetic-Recessed/dp/B00HR8CT8E/ref=br_lf_m_s6wxaka957nr7r3_img?_encoding=UTF8&s=hi

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