Connect the VCC (Red) and GND (Black) wires of the water flow Sensor to the 5v and Gnd of Arduino, and link Pulse Output (Yellow) wire of the water flow sensor to Arduino’s digital pin 2. Note that ...

Adding sensors to your Arduino opens up a whole new world of exciting projects. Here are some of the best sensors around. MUO. 8 Unique Sensors for Arduino Microcontroller Boards.