Energy-efficient heating-cooling system X89493

Design a circuit that controls a heating-cooling system of a room that has a remotely-controlled window. The system has four temperature sensors: two inside the room and two outside. The sensors inside the room indicate whether the temperature is too high (hot_in=1) or too cold (cold_in=1). The sensors outside the room indicate whether the temperature is sufficiently hot (hot_out=1) or cold (cold_out=1) to acclimatize the room.

The control system must save as much energy as possible, opening the window (open_window=1) when the outside temperature can be used to acclimatize the room. In case the outside temperature is not appropriate, the cooler of the heater must be activated.

Note that hot_in and cold_in can never be at 1 simultaneously. Similarly for hot_out and cold_out.

Specification

module heater_cooler_window (hot_in, cold_in, hot_out, cold_out,
                             heater, cooler, open_window);
    input hot_in, cold_in, hot_out, cold_out;
    output heater, cooler, open_window;

Input

• hot_in is the input that indicates when the inside temperature is too hot.

• cold_in is the input that indicates when the inside temperature is too cold.

• hot_out is the input that indicates when the outside temperature is hot.

• cold_out is the input that indicates when the outside temperature is cold.

Output

• open_window is the output that controls the opening of the window.

• heater is the output that activates the heater.

• cooler is the output that activates the cooler.