Joining several PIR sensors
The BISS0001 that your unit uses provides an &quot;active high&quot; output. To connect multiple devices together you just need to &quot;OR&quot; the signals.
There's many ways of doing that.
The simplest method is the &quot;wired OR&quot; circuit, which just involves one pulldown resistor plus one diode per device:



simulate this circuit &ndash; Schematic created using CircuitLab
You could also use a multiple-input OR gate chip. You can get these in 2- (74HC32), 3- (74HC4075), 4- (74HC4072) input versions.