Electronic control device for liquids

Control circuit for a bathtub having a hot water conduit and a cold water conduit and shower, drain and water heater, comprising in combination:

• temperature switch means for selecting the desired temperature of the water;
• level switch means for selecting the level of liquid within the bathtub;
• function switch means for selecting a bath or a shower function;
• level sensor means for sensing the actual level of liquid within said bathtub;
• means connecting said temperature switch means to control water flow from the hot and cold water conduits into the bathtub;
• level comparator means comparing level switch means and said level sensor for controlling the water flow and draining of the bathtub to maintain the water level in accordance with said level switch means;
• temperature sensor means for sensing the temperature of the water within the bathtub;
• memory means for storing the value of the temperature of the water within the bathtub upon the water level reaching a preestablished point;
• heater comparator means for comparing the water temperature within the bathtub with the value of the temperature stored in said memory means;
• and
• means connecting the output of said heater comparator means for controlling the water heater in the bathtub to maintain the water temperature in accordance with the value of the water temperature stored in said memory means.