YF-S201 Water Flow Sensor

Hall-effect water flow sensor. Outputs pulses proportional to flow rate. GPIO interrupt counting.

Sensor YF-S201 fluid gpio Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol gpio
Sensor type fluid
Model number YF-S201
Read interval seconds 10

Readings

SlugDevice classUnitRange
flow-rate volume_flow_rate L/min 1 to 30

Wiring

PinRequiredNotes
signal Yes Open collector output. Requires a pull-up and level shifting or division from 5V to 3.3V.

Supply: 5V

Failure modes

  • Output swings to 5V and must be divided or level shifted before a Raspberry Pi GPIO input.
  • Flow rate is derived from pulse frequency counted over a window. Polling the pin returns a level, not a rate, and yields nothing useful.
  • The pulses per litre constant varies between units and with flow rate. The nominal figure is an approximation and per-unit calibration is required for volume totals.
  • Below the minimum rated flow the impeller stalls and reports zero rather than a small flow.

Entry

Keyyf-s201
StatusDraft
Revision1
Registry0.3.0
Entry on GitHub JSON for agents

Join the Private Beta

Pre-registering for the IntelliConnect Beta provides early access to infrastructure features, the development roadmap, and early-adopter pricing tiers.

Early Access

Access to the broker, MCPs, rule engine, and developer console during launch phase.

Direct Support

Direct communication channel with the engineering team for integration assistance.

Discounts

Beta testers secure specialized pricing tiers for both Enterprise and Maker accounts.

Pre-register Now