Web Enabled Thermostat

$249 Not yet shipping.
http://www.nest.com/inside-and-out

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$395.00 Hot Deal $328.24
ecobee EB-STAT-02 ZigBee Enabled Smart Internet Thermostat

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Brainstorming competitive thermostat product: specs:
wifi to internet
measure the room temp
cheap LCD or 1 blinking LED for diagnosis

upgrade:
2 stage furnace control
extra battery for backup
light/motion sensor to help learning


upgrade control:
X10 networking/control
bluetooth for additional mechanism to control


upgrade sensors:
extra hardwired temp measurement for behind unit facing wall
humidity
oxygen %
carbon monoxide w/ audible alarm
gas (nat gas, propane) w/ audible alarm
smoke w/ audible alarm

companion website & apps:
upload current stats to website
configure & control
reports, trends (pull in outside temps)
website/apps free (can put in ads)

learn (intelligence hosted on website):
auto $ saving mode when sensing nobody home
start condititioning when mobile phone GPS shows person is nearing home

other:
consider subsidized thermostat if user allows microphone that will listen for radio/tv playing.  make it free if they will put listening/people monitor device in TV rooms.
allow smartphone app to be an additional temperature sensor, for phones with thermostat OR sell standalone temp sensor.


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http://web.me.com/jaysettle/Jay/Arduino_Equipped_Still.html

Temp sensor, light sensor, LCD display, actuator.

Arduino from www.sparkfun.com $30
temperature sensors TMP 36GZ from Adafruit $2
16X2 LCD $25

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Home brew:

Hardware ~100.  thermostat directly controls my HVAC unit, which has a standard four-wire interface. One wire is common, and there is one wire for each of Heat, Cool (A/C), and Fan. I'm using an LM35 to measure the temperature, three relays to connect the HVAC, a nice 20x2 LCD display for status, and some buttons and switches, all mounted into a project box. Since the Arduino has a built-in USB interface, I use that to provide status back to the computer, and allow the computer to issue commands.

Building A Thermostat Using Arduino
arduino, a few solid state relays, and a temperature sensor from adafruit.

$108 I bought a Dallas Semiconductor 18B20 digital temperature sensor ($4), along with the relay I needed for the second thermostat switch ($2), a wall-wart AC adapter to power the Arduino ($6), and a 5-V wall wart to operate the relay ($6).


Thermostat with web interface

Arduino thermostat with WEB interface

Arduino Remote Thermometer

arduino-thermostat

Web thermostat with Arduino

Arduino Weather Station / Thermostat

github arduino-thermostat



$26 ARDUINO UNO BOARD REV3


$2 TMP36 - Analog Temperature sensor
$29 Humidity and Temperature Sensor - SHT15


$55 WiFi Shield WiShield V2.0 for Arduino
$90 WiFly Shield


$1.50 Mini Photocell
$3 Light to Frequency Converter - TSL235R

Part cost for simple thermostat $96.  Excludes labor.
case ~10
packaging/manual ~3
arduino board 26
wifi 55
temp 2