PIR Motion Sensor Hookup Guide
The circuit for this example is about as simple as it gets. Grab three jumper wires and insert them into the JST connector. It gets a little tight, but they should all be able to fit in there.
Connect the power (red) and ground (white) wires up to 5V  and GND respectively. Then connect the black alarm wire to Arduino pin 2.
We'll use the internal pull-up resistor on D2 to complete the circuit. Whenever the sensor is inactive, the pin should read high. When motion is detected, the sensor will pull D2 low.