This circuit was found in a 1966 General Electric documentation. It makes use of direct contact water sensors and therefore requires an isolation or low voltage relay drive transformer.
This circuit uses uncommon Texas Instruments components today. The circuit is from an American...
This circuit makes simultaneous control of two up to 150 W incandescent lamps. The circuit is half wave...
Several types of OSEPP sensor modules can be obtained from Mouser Electronics for Arduino...