Programmable Thermostat Project

Description

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

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?
• Have certain software capabilities
  • Independently adjustable hysteresis for hot and cold limits
  • Relaxable hysteresis based on timeout with audible warning of relaxation
  • Relaxation cancellation capability (local or remote user can silence alarm and reset timeout)