I need a motion Dectour that can turn on a programable

Lynxmotion
1

I need a motion Dectour that can turn on a programable robtic arm, does someone have any suggestions or something

2

You can use a PIR sensor for this.

go here:

parallax.com/detail.asp?product_id=555-28027

3

What exactly do you mean by “turn on”?
Do you wish the device to switch on the power directly, or do you wish to simply send the arm’s microcontroller an allert to “wake up” and start moving the arm?

If you wish to switch on or off the power being supplied to the arm, I’d suggest using MOSFETs.
Otherwise, polling a single I/O pin with your micro every so often to check for motion should do fine…