The YF-S201 Water Flow Meter Sensor is an inline flow sensor with a standard G1/2" threaded connection, designed to measure and monitor the movement of water through a pipe. As water passes through, an internal rotor spins and the sensor sends out pulses that can be read by a microcontroller, making it a popular choice for irrigation monitoring, smart watering setups, hydroponics, and DIY electronics projects. It suits home gardeners, hobbyists, makers, and small-farm owners who want to track how much water is flowing.
Key features
- Standard G1/2" threaded ports for easy inline fitting into common water lines.
- Pulse-output design that pairs well with Arduino, ESP32, and similar microcontrollers.
- Compact body that installs directly between hose or pipe sections.
- Simple, reliable mechanical sensing for everyday water-flow monitoring.
Typical uses
- Measuring water flow in drip and garden irrigation lines.
- Smart-home and automation projects that log or control watering.
- Hydroponic and greenhouse water-monitoring setups.
- Student, hobby, and prototyping electronics projects.
How to choose / tips
- Confirm your pipe or fitting matches the G1/2" thread before ordering.
- Mount the sensor in the flow direction marked on the body.
- Use thread tape on the connections to avoid leaks.
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