With the importance of cultivation and protection of tender plants came the need for a greenhouse. This project deals with one important aspect of a greenhouse, temperature. A thermostat comprised of thermistors will relay temperature information to a controlling processor, a Motorola 68HC11. This processor, in turn, will communicate with fans and a furnace through solid-state relays to control the temperature. Two features of this system include; one, a user recognition of overall average temperature, and two, the ability to program the upper and lower bounds of the temperature settings with a keypad and a readout. In general, this system is compatible with many temperature controlled environments.   
 

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