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YF-S401 water flow sensor
Compact water flow sensor with hall-effect pulse output for accurate measurement. Ideal for irrigation, water monitoring, and DIY projects.
Description
The YF-S401 Water Flow Sensor is a precision device designed to measure the flow rate of water in pipes and systems. It features a hall-effect sensor and rotor mechanism that generates pulse signals proportional to the water flow, making it easy to interface with Arduino, Raspberry Pi, or other microcontrollers. Ideal for irrigation systems, water dispensers, and DIY water monitoring projects, the YF-S401 provides accurate, real-time flow measurements. Durable and compact, it ensures reliable performance in both domestic and industrial applications.
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- 30 mA idle
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- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes
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