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  • MartinP54 commented on vina1991's instructable $1 AUTOMATIC WATER LEVEL CONTROLLER3 years ago

    I am a little confused with the sensors, you only place the cables to detect the water level, but maybe I'm too new in this subject. I dont really get how the cables are going to produce a signal so the relay knows the state in which the sensor is . Can you detail a little bit more about this ?

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