The Design of PIR Thermometer Based on ARM Microprocessor;
比如,PIR为350的人表示他们的收入是贫困线的350%。
Alternatively passive motion sensors, also known as PIR (passive infrared) sensors are typically used on security lights which detect the heat of a human body.
被动式运动传感器,也称为PIR(被动式红外线)传感器,通常用于能够检测人体热量的安全灯。