First post and first project! Need help!

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hi everyone!

ok mentioned first post , first project! i'm trying accomplish project ir motion detector transmits via 2 way radio. i'm pretty sure how of goes except how arduino send signal via radio. appreciate much more knowledgeable folks. here video on youtube inspired project. want same thing.

http://m.youtube.com/watch?v=jk5mq90_sye

it's little hard understand arduino comes equation ?

what want arduino do?


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