heartbeat sensor
Source: InternetPublisher:两手空空 Keywords: LED sensor power supply and other power circuits Updated: 2020/07/29
A simple heartbeat sensor consists of an infrared LED and an infrared phototransistor. It works by using the skin as an infrared light-reflecting surface. The infrared reflection of a person's skin depends on the concentration of blood in it. As the heart beats, blood density rises and falls.
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