MOTION DETECTION: HC-SR501 Human Infrared Sensor Module

Triggered in two ways: (jumper selectable)

- non-repeatable trigger: the output switches back to low a few seconds after detection

- repeatable trigger: the sensor output high, the delay period, if there is human activity in its sensing range, the output will always remain high until the people left after the delay will be high level goes low (sensor module detects a time delay period will be automatically extended every human activity, and the starting point for the delay time to the last event of the time).