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Pzsmocn Hall Sensor Compatible with Arduino and Raspberry Pi. Detection Range About 3cm (Detection Range Related to Strength of Magnetism), for Non-Contact Switch and Magnetic Related Project.: Amazon.com: Industrial & Scientific
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Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Door/Window Alarm GPIO Project Kit for Raspberry Pi. Includes breadboard, magnetic reed switch door sensor, three metres of bell wire and components. Includes PDF manual & example scripts. - Newegg.com
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