Joining several PIR sensors I wish to use some PIR (HC-SR501) sensors and give some response if at least one of them detects human movements.
For simplicity I wish to use only one input pin in an Arduino UNO. My idea is to connect all the output wires into a single Arduino digital input. Should it work?
I am in doubt because the following two reasons:

The sensors must be far away from each other (about 5 sensors partially covering an area of about 200 m^2). That implies that wires are long and I do not know if this can have some adverse effect.
I do not know if it is bad to supply the 3.5V of some sensor that is currently detecting movement to the output of the sensors that are not detecting anything.

Thanks in advance
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.