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Water flow sensor module

TomasOsP·water-flow-sensor-module

Water flow sensor module layout, top view — open source board by TomasOsP

About the Water flow sensor module

Water flow sensor module is an open source PCB design by TomasOsP, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 41.5 × 60.5 mm, with 25 components from 7 distinct parts.

Other key parts include the PC817. By type, the board carries 8 resistors, 5 connectors, 4 ICs and 4 diodes.

It belongs with the sensors designs in this gallery.

From the project

4-channel 5V→24V opto-isolated flow-sensor→PLC interface — KiCad hardware (CC BY 4.0)

A 4-channel, opto-isolated interface board that adapts 5 V flow-meter sensors to the 24 V digital inputs of an industrial PLC. Built for a smart-water-dispenser retrofit, it lets the PLC count pulses from hall-effect flow sensors safely and without ground coupling.

The dispenser's flow meters output pulse trains at 5 V, but the PLC's digital inputs expect 24 V logic and must stay galvanically isolated from field wiring. This board bridges the two domains with one PC817 optocoupler per channel: the sensor side drives the opto LED through a current-limiting resistor, and the PLC side pulls a…

Main components on the Water flow sensor module

PC817

Water flow sensor module bill of materials (BOM)

25 components, 7 distinct parts — part numbers from the project's BOM.

QtyPartRefs
4
PC817
U1, U2, U3, U4
1
Supply
J1
4
S_In
J2, J3, J4, J5
4
C
E1, E2, E3, E4
4
LED
D1, D2, D3, D4
4
3k
R1, R3, R5, R7
4
100k
R2, R4, R6, R8

Water flow sensor module design files

The KiCad project lives in the TomasOsP/water-flow-sensor-module repository on GitHub; these links point at the commit this page was built from.

Water flow sensor module: common questions

How big is the Water flow sensor module?

The Water flow sensor module measures 41.5 × 60.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Water flow sensor module?

25 components, from 7 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Water flow sensor module design files?

From the TomasOsP/water-flow-sensor-module repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Water flow sensor module design in my own project?

Yes, under the terms of its CC-BY-4.0 license, which TomasOsP chose for the repository.

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