This sensor detects changes in infrared radiation which occur when there is movement by a person (or object) which is different in temperature from the surroundings.

AMN11112 motion sensor is passive infrared sensor which detect changes in the infrared rays. When movement is detected, sensor output will be logical 1. AMN11112 may fail to detect successfully if a heat source other than a human being is detected or if there are no temperature changes in or movement of a heat source. Care must generally be taken in the following cases. The performance and reliability of the sensor must be checked out under conditions of actual use.