4.2mm for sale, brand-new and used.

Works good for door sensor, model train sensor, microchip, Picaxe, Arduino sensor The contacts are Normally Open, when a magnet is places near the END, there is a closed contact. These have been put near a model train, with the magnet on the train. As it goes by, the controller can sense the location.

a¦aЂ“a°a?a»a?a§a 1/2 aЂ~a©a?aµ 6 TTP223B Digital Touch Sensor Capacitive Touch Switch Module DIY for Arduino

10pcs Reed switch MagSwitch 2 * 14mm Normally open Magnetic induction switch Product Description pecification Glass Length 14mm Glass Diameter

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New Digital Touch Sensor TTP223B Module Capacit

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