Networked Smart Thermostat
Control your home’s heating and cooling from anywhere.
At my hackerspace, i3 Detroit, we have programmable thermostats that frustratingly reset your settings at fixed times. At home, our old thermostats just have a setting lever, and our power company has started time-of-day metering. So I decided to replace the thermostats at both i3 and home with smarter, programmable, networked versions.
Standard forced-air HVAC systems are surprisingly easy to control. The standard thermostat cable in the walls contains color-coded wires with the following functions:
R — Red — 24V AC power
Y — Yellow — Cooling
W
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