this video is on how to use PIR sensor with arduino
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Step 1: Materials Required
1. pir sensor
2. jumper wires
3. arduino uno
4. 220 ohm resistor
5. 5v dc relay
6. two LEDs of different colour
Step 2: Wiring
all the wiring is easily deccribed in circuit diagram
and sketch code is in given link-
Step 3: Watch Video