Spark Core Water Sensor
I’ve been playing around with a Spark Core, which is a small, cheap ($39) Wifi-enabled Arduino-compatible device. As a software guy, I don’t do much with hardware, but the Spark Core makes it really easy to get going.
The whole setup is pretty simple, and I’ve put all the relevant firmware and software up on Github in case anyone else is interested in doing something similar. Total hardware cost was $42, and just $1/month for Twilio.