I have several standard BISS0001 based PIR sensor modules, but lack any sensitivity trim pot.
I am hoping there might be a way to reduce range/sensitivity to a very small field. Currently they are detecting motion about 15-20 feet away.
Does anyone know of a way to reduce the field as low as maybe a 1 foot radius?
I am using them with an Arduino Mega 2560 or an Arduino Uno.
I have tried placing various objects / films in front of the sensor.
Running the sensor through a tube (cardboard or PVC) seems to effectively reduce the sensor to a very narrow beam of detection, however I also need to reduce the overall range, as even with through the tube the sensor fires off at 15-20 feet away. I have tried placing plastic wrap or the reflective static free plastic that electronics are shipped in over the end of the tube, these do not seem to do the trick.