May be I am doing a stupid question but: if sensor like water flow ones are like a switch that every turn make the output going high for a short time, why have they 3 pins?I think it would be sufficent to have 2. Using a pull up resistor, one must be connected to digital_in and to the resistor going at 5v and the second connected to GND.What's the reason of using one more pin? thanks
May be I am doing a stupid question but
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