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I recently ordered the HC-SR501 Adjustable PIR Sensor. I understand that the sensor delay is adjustable. There is another adjustment (potentiometer). Not sure if it is a sensitivity adjustment. Also, there are three pads in the corner of the circuit board labeled “MD:, “L”, “H”. Are these pads useful to the user? It would be appreciated if there was a slip of paper indicating which pot. does what.
I have attached some pictures to help illustrate the HC-SR501 functionalities. In order to choose a trigger setting, you must solder the “L” or “H” pad to the center pad.
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