I have a water tank and I have three of these float switches mounted at various depths: https://www.amazon.com/Black-Sensor-Controller-Liquid-Switch/dp/B073LN5PP8/ref=sr_1_15?s=automotive&ie=UTF8&qid=1506363848&sr=1-15&keywords=water+level+sensor ] When the float is raised in the horizontal positio…

Is a pullup resistor always required for a switch?

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