Hi there, I am looking for a sensor that will receive signal and pass it to the computer when a hand is closed to it. The distance is about 10cm to 30 cm. Any recommand? Which product I should use? Thank you in advance.

3520 or 3521

-Patrick

Thanks Patrick!
So now I need 3 3520 sensors, could you please look at the package below and tell me what was I missing:
Because I live in the far far away kindom, and dont want to buy the wrong ones.
3004 Sensor Cable 350cm Qty:3
3520 Sharp Distance Sensor 2D120X(4-30CM) Qty:3
1018 PhidgetInterfaceKit 8/8/8 Qty:1
1101 IR Distance Adapter Qty:3

That looks like everything you'll need.

-Patrick