Energy-efficient heating-cooling system

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.

Problem information

Author: Jordi Cortadella

Generation: 2026-02-03T12:15:23.822Z