4、oniswidelyused. Thisarticlediscussesthepyroelectricinfraredsensorcandetectthehumanformofnon-contactinfraredradiation,andconvertitintovoltagesignal,thenthevoltagesignalamplifiedbyLM324,comparisoncircuits,tocontrolalarmcircuittowork,inordertoachievehumanexploration function