# AC Current Sensor to detect treadmill usage

I would like to build an AC current sensor to detect if my treadmill is being used (the treadmill would plug into my device, which is plugged into the wall). I would then like my device to tell me what the AC current is (so I can see if the treadmill is on) and transmit this info via Wifi.

What kind of components would I need, and at what cost? I am open to using the Arduino, but if it can be built without one that's preferable.

There are many wireless things you could do: XBee, WiFi, Bluetooth, etc. All of them are somewhat expensive $80-200 range. Logging data to a MicroSD might be an easier solution. • Thanks! Would this Wifi SOC work? It's only$26. semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=47831 – user1137778 Dec 13 '12 at 6:17