I bought a Ninja Block about three years ago, which is essentially a Arduino + Node.js server thing that runs on the device to send the data from your devices (in my case, just two 433Mhz ...

But as an added twist, the oscillator is keyed by an ATtiny13 hooked to an LM335 temperature sensor, sending out the Celsius and Fahrenheit temperature in Morse every 30 seconds or so.