# Gravity: Digital Water Flow Sensor For Arduino - 1/8

**Type:** Product page · **SKU:** SEN0216 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/gravity-digital-water-flow-sensor-for-arduino-1-8.html ([markdown](https://core-electronics.com.au/gravity-digital-water-flow-sensor-for-arduino-1-8.html.md))

The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S401 water flow sensor consists of a plastic valve body, flow rotor and hall effect...

## Pricing

- **Price:** $17.05 (inc GST) — $15.50 AUD, exc GST
- **Quantity discounts:** 6+ $14.73 (exc GST) · 12+ $14.11 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 1 today, and up to 29 more in 8–12 days.

## Description

**Introduction**

 The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S401 water flow sensor consists of a plastic valve body, flow rotor and hall effect sensor. It is usually used at the inlet end to detect the amount of flow. When liquid flows through the sensor, a magnetic rotor will rotate and the rate of rotation will vary with the rate of flow. The hall effect sensor will then output a pulse width signal. Connect it to a microcontroller and you can monitor multiple devices such as your coffee maker, sprinkler or anything else, and control the water flow rate to suit your needs!

![](https://core-electronics.com.au/attachments/localcontent/Arduino_Connection_23164df6a5b.png)
 Note:
 \*A 6 mm hose is recommended
 \*Avoid unit contact with corrosive chemicals
 \*The unit must be installed vertically, tilted no more than 5 degrees
 \*Liquid temperature should be less than 120 C to avoid damage to unit

 **Specification**

5. Inner Diameter: 4 mm
6. Outside diameter: 7 mm
7. Proof Water Pressure: <0.8 MPa
8. Water Flow Range: 0.3-6 L/min
9. Voltage Range: 5~12 V
10. Operating Current: 15 mA (DC 5V)
11. Insulation Resistance: >100 MO
12. Accuracy: ±5% (0.3-3L/min)
13. The Output Pulse High Level: >4.5 VDC (DC input voltage 5 V)
14. The Output Pulse Low Level: <0.5 VDC (DC input voltage 5 V)
15. Output Pulse Duty Ratio: 50% ± 10%
16. Water-flow Formula: 1L = 5880 square waves
17. Working Humidity Range: 35% ~ 90% RH (no frost)
18. Dimension: 58\*35\*26 mm/2.28\*1.37\*1.02 inches
19. Weight: 30g

 **Documents**

21. Product WIKI
22. More Documents
 **Parts List**

24. Gravity - Water Flow Sensor - 1/8" x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0216-1.jpg)