Infrared trigger cameras generally use infrared receiver chips, such as infrared receiver modules TSOP38238, HX1838 and so on. These chips work based on the reflection or emission of infrared light, triggering the shutter to open when the camera picks up the infrared signal. These chips can not only identify infrared signals, but also identify infrared signals of different frequencies, so as to avoid false triggering.
In addition, infrared sensor chips can also be used, such as GP2Y0A02YK0F, which can identify the distance of the object and output the corresponding voltage signal, which is convenient to control the shutter and exposure time of the camera according to the signal.