The main problems stays when there's is more than two sensors, to allow them to communicate easily and to be identified.
I would have little, cheap, and low power consumers wireless sensors. My choice is perhaps to use Arduino Nano cards, with the sensor of my choice. To communicate with the main "central", I thought about RF Transcievers from Sparksfun.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16