Water flow sensor (Sea) YF-S201 Flowmeter G1/2 1-30L/min Black

The Water flow sensor (Sea) YF-S201 Flowmeter measures how much water passes through a pipe. Inside, a small turbine spins with the flow, and a magnet and Hall-effect sensor produce pulses at a rate proportional to the flow, so an Arduino or ESP32 can count them to calculate flow rate and total volume. It has G1/2 threaded ends and covers 1 to 30 L/min.

Water flow sensor YF-S201 Specifications

• Model: YF-S201
• Sensor type: turbine with Hall-effect pulse output
• Flow range: 1–30 L/min
• Connection: G1/2 thread
• Working voltage: 4.5–18 V DC
• Current draw: up to 15 mA at 5 V
• Pulse output: frequency (Hz) = 7.5 × flow (L/min), about 450 pulses per litre
• Wires: red (+V), black (GND), yellow (pulse signal)
• Colour: black

Water flow sensor Applications

• DIY water meters and consumption monitors
• Water dispensers that pour a set volume
• Garden irrigation and tank filling control
• Leak detection and flow alarms on ESP32 IoT dashboards

What's in the Box

• 1 × YF-S201 water flow sensor, G1/2, black

Tip: Connect the yellow wire to an interrupt pin (D2 on the Arduino Uno) and count pulses for one second: flow in L/min = pulses ÷ 7.5. If you power the sensor at 5 V and read it with an ESP32, add a voltage divider on the signal line to keep it at 3.3 V, and fit the sensor with the arrow on the body pointing in the direction of flow.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.