it this instructable I am going to show how to build a motion sensing device with pir sensor and Arduino
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just go on YouTube and see it because I know how precious your time is you can't waste your time reading .
Step 2: Material Required
*Arduino pro mini
*3.7 volt battery
Step 3: Program for Arduino:
code are taken from
connect the circuit like the image given above
Step 5: Assembly
assemble the circuit in a box like shown in above image
Step 6: My Advice
for understanding the project more better I refer you to watch the video of 3 minute by the link given below