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Check out Grove – PIR Motion Sensor. Simple to use PIR motion sensor with Grove interface. The detecting distance is 6m maximum and detecting angle is 120 degree. The detecting distance and holding time can be adjustable by potentiometers. The sensor outputs HIGH on its SIG pin – ideal for motion sensing applications.
Buy Grove – PIR Motion Sensor from Pakronics:
http://www.pakronics.com/collections/feature-products/products/ss101020020