Programmable Thermostat Project

Creator: Opticron Status: Early Development Born On: 15:29, 26 January 2011 (CST) Last Updated: 10:21, 31 January 2011 (CDT)

Overview

A programmable thermostat is required to keep costs down while keeping everyone as happy as possible with the temperature of the shop.

Hardware Requirements

The programmable thermostat should:

• Be remote controllable (all features)
  • Wifi, indirect network connection such as serial to a laptop, xbee
• Be able to control a heating device via 120V relay
  • 1 GPIO
• Be able to control a cooling device via 120V relay
  • 1 GPIO
• Be able to control a heating or cooling device by remote means
  • Currently, X10 and X10 via network proxy are options
• Have a user interface for people to interact with at the physical location
  • LCD with buttons
• Be able to monitor temperature accurately in one or more locations
  • DS18B20+ temp sensors
  • USB temperature sensor?
  • Built-in temp sensor?
  • Wireless Weather Sensors

Software Requirements

• • Occupied hot target with hot-side hysteresis
  • Unoccupied hot target with hot-side hysteresis
  • Occupied cold target with cold-side hysteresis
  • Unoccupied cold target with cold-side hysteresis
  • Transition from occupied to unoccupied state after a timeout and audible alarm
  • Local or remote user can silence alarm and reset timeout

Solution 1

• Arduino with a setup similar to the one that made hackaday.
• Wireless capability would need to be added to this solution along with the external control mechanism
  • WiFi shield?

Solution 2

• Dockstar
  • Already runs linux, so easy to add a remote interface
• Alpha WiFi USB dongle