[HH] Android Thermostat

[Tom Metro]

Here's something useful you can do with an obsolete Android phone.

http://androidthermostat.com/

  Android Thermostat is an open source thermostat project ideal for
  programmers and electronics hobbyists.  As the name suggests the
  application runs on Android phone that is connected to some basic
  electronic components for controlling your home HVAC system.It costs
  around $140 to build and can be assembled in an afternoon.

That $130 price includes $40 for a used phone. The rest of the cost goes
to building and packaging the circuitry to interface to the thermostat
lines from your furnace.

It's built on Sparkfun's IOIO (pronounced "yo-yo") interface board, at
$50 the single most expensive item in the project. It "provides robust
connectivity to an Android device via a USB or Bluetooth connection and
is fully controllable from within an Android application using a simple
and intuitive Java API - no embedded programming or external programmer
will ever be needed." Basically a micro on a perf board with some canned
code to do PWM and other I/O stuff.

 -Tom