1/2" Water Flow Sensor Food Grade Switch Hall Effect Flowmeter
4.1Editor score
Food grade plastic construction
1 to 30 liters per minute range
DC 5 to 24 volt working voltage
10 Best Arduino Flow Meter (October 2026) Expert Guide
Arduino flow meters are essential components for makers and engineers who need precise water measurement in their projects. These sensors convert fluid movement into electrical signals that microcontrollers can read easily.
We evaluated ten top-rated models based on flow range, build quality, and compatibility with common boards. Our selection includes options for small hobby projects and industrial applications alike.
Each pick highlights key specifications and real-world use cases to help you choose quickly. Please note that product availability and terms may change without prior notice.
Top 3 Picks for Best Arduino Flow Meter
DIGITEN G1.5" Water Flow Sensor Hall Effect Sensor Flow Meter
5.0Editor score
5 to 150 liters per minute range
ROHS compliant materials for potable water
G1.5 inch BSPT male thread connection
DEVMO 1/2" Water Flow Hall Sensor Control Switch Fluid Flow Meter
4.9Editor score
High amplitude voltage output above 4.6 volts
Suitable for water cooling systems
Electric strength rated 1250 volts per minute
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Top 10 Best Arduino Flow Meter in 2026 Compared
This side by side comparison covers all ten models to highlight their flow ranges, thread sizes, and key features for easy selection.
ProductsSpecificationsEditor scorePrice
Best Budget
1/2" Flow Hall Sensor with NPT Thread
1 to 30 liters per minute flow
NPT thread connection type
Integrated magnetic hall effect sensor
Suitable for water heaters
4.7Editor score
Editor's Choice
DEVMO 1/2" Water Flow Hall Sensor
1 to 30 liters per minute flow
High amplitude voltage output
Low amplitude voltage below 0.5 volts
Water cooling system compatible
4.9Editor score
Editor's Choice
DIGITEN G1.5" Water Flow Sensor
5 to 150 liters per minute flow
G1.5 inch BSPT male thread
DC 5 to 18 volt working range
Water pressure up to 1.75 Mpa
5.0Editor score
1/2" Water Flow Sensor Food Grade Switch
1 to 30 liters per minute flow
G1/2 inch BSPT male thread
DC 5 to 24 volt working range
Food grade plastic material
4.1Editor score
2Pcs YF-S201C DC3.5-24V Transparent Flow Sensor
1 to 30 liters per minute flow
Transparent valve body for observation
DC 3.5 to 24 volt working range
Stainless steel beads in impeller
3.7Editor score
1/4" Water Flow Sensor Food Grade Switch
0.3 to 6 liters per minute flow
G1/4 inch connector for hosepipe
DC 5 to 24 volt working range
Water pressure up to 0.8 Mpa
4.2Editor score
Taidacent YF-S201 Hall Effect Water Flow Sensor
G1/2 inch interface option
Plastic valve body construction
Magnetic rotor rotation detection
Pulse signal feedback to controller
5.0Editor score
DIGITEN G1/2" Water Flow Sensor with Cable
1.2 meter cable length included
1 to 30 liters per minute flow
SM2.54 3P wire connector type
Square wave output pulse signal
4.8Editor score
DIGITEN G3/8" Water Flow Sensor Hall Effect
0.3 to 10 liters per minute flow
G3/8 inch thread connection
DC 3.5 to 12 volt working range
Compact and easy to install
4.5Editor score
DIGITEN G3/4" Water Flow Sensor with Cable
1 to 60 liters per minute flow
1.2 meter cable length included
G3/4 inch BSPT male thread
Water pressure up to 1.75 Mpa
3.2Editor score
1. 1/2" Water Flow Sensor Food Grade Switch – Best Overall Arduino Flow Meter
1/2" Water Flow Sensor Food Grade Switch
Flow range 1 to 30L per min
G1/2 inch BSPT male thread
Working voltage DC 5 to 24 V
Material food grade plastic
This model serves as an excellent entry point for Arduino projects requiring water flow detection. With a solid 4.1 rating, it balances cost and functionality effectively for general use cases.
Pros
- Affordable price point
- Food grade plastic material
- Wide voltage range support
- Easy G1/2 inch thread
- ROHS compliant raw materials
Cons
- Slightly lower rating than top picks
- Limited flow range compared to G1.5
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Its food grade plastic construction ensures safety for potable water applications like coffee machines or drinking fountains. The G1/2 inch thread makes installation straightforward on standard pipes.
While the flow range is limited to 30 liters per minute, it covers most small to medium DIY needs. The wide voltage support allows flexible power sourcing from various boards.
Buy this if you need a reliable, budget friendly sensor for basic water monitoring tasks. It provides consistent pulse output for accurate counting without complex calibration.
Safe Potable Water Use
All raw materials conform to ROHS testing standards ensuring safety for drinking water applications.
Flexible Power Options
Operating from 5 to 24 volts allows connection to 5V logic boards or 24V industrial systems.
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2. DIGITEN G1.5" Water Flow Sensor – Best High Volume Arduino Flow Meter
DIGITEN G1.5" Water Flow Sensor
Flow range 5 to 150L per min
G1.5 inch BSPT male thread
Working voltage DC 5 to 18 V
Water pressure up to 1.75 Mpa
This sensor stands out with a flawless 5.0 rating making it the top pick for demanding projects. Its large G1.5 inch thread handles higher volumes without restricting flow.
Pros
- Perfect 5.0 user rating
- Highest flow capacity available
- G1.5 inch thread for larger pipes
- ROHS compliant potable water safe
- Pressure resistance up to 1.75 Mpa
Cons
- Higher cost than budget options
- Requires larger pipe connections
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The 5 to 150 liter per minute range supports everything from small tanks to commercial water systems. Materials meet ROHS standards ensuring safe use with drinking water.
Installation requires matching the BSPT thread and sealing properly to prevent leaks under high pressure. The square wave output integrates easily with Arduino interrupt pins.
Choose this for professional or high flow applications where precision and durability are critical. It offers the best balance of capacity and reliability in the lineup.
High Flow Capacity
Supports up to 150 liters per minute ideal for large scale water monitoring or industrial processes.
Durable Pressure Resistance
Handles water pressure up to 1.75 Mpa without deformation or performance degradation over time.
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3. DEVMO 1/2" Water Flow Hall Sensor – Best Premium Arduino Flow Meter
DEVMO 1/2" Water Flow Hall Sensor
Flow range 1 to 30L per min
High amplitude voltage output 4.6V
Low amplitude voltage below 0.5V
Electric strength 1250V per min
With a near perfect 4.9 rating this model delivers premium performance for critical fluid measurement tasks. Its high voltage output ensures clean signals even in electrically noisy environments.
Pros
- Very high 4.9 rating
- High amplitude voltage signal
- Strong electric strength rating
- Suitable for cooling systems
- Compact 1/2 inch size
Cons
- Higher price point
- Limited to 30 liters per minute
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The 1250 volt per minute electric strength indicates robust insulation quality suitable for industrial or commercial settings. It works well in water cooling systems where stable readings matter.
Though it shares the 30 liter per minute range with others the electrical specs set it apart. The compact size fits tight spaces without sacrificing signal quality.
Invest in this if signal integrity and durability are your top priorities. It provides reliable data for systems where false readings could cause operational issues.
High Voltage Signal Output
Amplitude above 4.6 volts provides strong logic levels that are less prone to interference or noise.
Robust Electrical Insulation
Electric strength of 1250 volts per minute ensures safety and longevity under demanding electrical conditions.
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4. 1/2" Flow Hall Sensor with NPT Thread – Best Standard Flow Meter
1/2" Flow Hall Sensor with NPT Thread
Flow range 1 to 30L per min
NPT thread connection type
Integrated magnetic hall effect sensor
Suitable for water heaters
This sensor offers a practical solution for standard plumbing connections with its NPT thread design. A strong 4.7 rating reflects consistent performance across various water applications.
Pros
- High 4.7 user rating
- Standard NPT thread type
- Lightweight and easy to install
- Integrated hall effect sensor
- Reverse osmosis compatible
Cons
- NPT may require seal tape
- Requires correct flow direction
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Its lightweight design simplifies installation on coffee machines or water purifiers where space is limited. The hall effect sensor stays sealed from water ensuring long term reliability.
Remember to install it in the correct flow direction or it will not output signals. You may need thread seal tape to prevent leaks at the connection point.
Select this for general purpose water metering where NPT fits are common. It delivers dependable pulse counts for Arduino logic without extra complexity.
Standard NPT Thread
Uses common NPT threading for easy connection to standard pipes and fittings in home systems.
Sealed Hall Sensor
The magnetic hall sensor is fully sealed from water protecting electronics and extending sensor life.
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5. 2Pcs YF-S201C DC3.5-24V Transparent Flow Sensor – Best Value Pack Flow Meter
2Pcs YF-S201C DC3.5-24V Transparent Flow Sensor
Flow range 1 to 30L per min
Transparent valve body for observation
DC 3.5 to 24 V working range
Stainless steel beads in impeller
Buying this pack gives you two sensors which is great for redundancy or multiple projects. The transparent body lets you visually confirm flow and rotor condition without removing it.
Pros
- Two sensors included in pack
- Transparent body for flow view
- Wide voltage range support
- Stainless steel bead impeller
- Lightweight flexible design
Cons
- Lower 3.7 rating than others
- Transparent body may be fragile
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Stainless steel beads inside the impeller add wear resistance for longer life under continuous flow. The 3.5 to 24 volt range works with many microcontroller power sources.
The 3.7 rating suggests some variability in quality so inspect upon arrival. However the price per unit makes it a smart choice for bulk needs or testing.
Get this if you need extra sensors for calibration or backup. It offers good features at a lower cost compared to single unit premium models.
Visual Flow Confirmation
Transparent valve body allows direct observation of rotor movement and water flow status.
Impeller Durability
Stainless steel beads inside the impeller resist wear and maintain accuracy over time.
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6. 1/4" Water Flow Sensor Food Grade Switch – Best Small Flow Flow Meter
1/4" Water Flow Sensor Food Grade Switch
Flow range 0.3 to 6L per min
G1/4 inch connector for hosepipe
Working voltage DC 5 to 24 V
Water pressure up to 0.8 Mpa
This model is ideal for low flow applications where precision at small volumes is needed. Its G1/4 inch connector fits directly onto common hosepipes without adapters.
Pros
- Handles low flow rates well
- G1/4 inch hosepipe connector
- Food grade plastic construction
- Wide voltage range support
- Compact lightweight design
Cons
- Lower pressure rating 0.8 Mpa
- Not for high flow applications
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Food grade plastic ensures safe contact with drinking water in dispensers or vending machines. The 0.3 to 6 liter per minute range captures even slow drips accurately.
The pressure limit of 0.8 Mpa means it suits low pressure systems. Avoid using it in high pressure lines to prevent damage.
Choose this for drip irrigation, small pumps, or beverage dispensing where flow is minimal. It provides sensitive detection for applications that bigger sensors miss.
Low Flow Sensitivity
Detects flow rates as low as 0.3 liters per minute for precise monitoring of slow systems.
Hosepipe Compatible
G1/4 inch connector matches standard hosepipe sizes for direct integration without extra fittings.
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7. Taidacent YF-S201 Hall Effect Water Flow Sensor – Best Multi Interface Flow Meter
Taidacent YF-S201 Hall Effect Water Flow Sensor
G1/2 inch interface option
Plastic valve body construction
Magnetic rotor rotation detection
Pulse signal feedback to controller
This model earns a perfect 5.0 rating thanks to its reliable design and multiple interface options. The magnetic rotor changes speed with flow rate for accurate pulse generation.
Pros
- Perfect 5.0 user rating
- Multiple interface points available
- Plastic valve body
- Magnetic rotor detection
- Pulse signal feedback
Cons
- Specific interface variant listed
- Check compatibility before buying
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It connects directly to water heater inlets to detect inflow rates for temperature regulation. The pulse signal feeds back to controllers enabling real time flow adjustments.
Plastic valve construction keeps it lightweight and corrosion resistant. Ensure you pick the right interface variant for your plumbing setup.
Select this for water heaters or dispensers requiring precise flow regulation. It offers proven performance for temperature control and safety applications.
Real Time Regulation
Pulse signal feedback allows controllers to adjust flow and temperature in real time.
Multiple Interface Options
Available in 4 or 6 point configurations to match different plumbing requirements.
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8. DIGITEN G1/2" Water Flow Sensor with Cable – Best Cable Extended Flow Meter
DIGITEN G1/2" Water Flow Sensor with Cable
1.2 meter cable length included
Flow range 1 to 30L per min
SM2.54 3P wire connector
Square wave output pulse
The included 1.2 meter cable simplifies placement away from tight enclosures. This flexibility helps position electronics safely while keeping the sensor inline with pipes.
Pros
- Includes 1.2 meter cable
- High 4.8 user rating
- SM2.54 3P connector type
- ROHS compliant materials
- Square wave output
Cons
- Connector type may require adapter
- Fixed cable length
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A strong 4.8 rating reflects reliable performance with the SM2.54 3P connector for easy plug in connections. The square wave output is standard for microcontroller interrupts.
Materials meet ROHS standards ensuring safe use with drinking water. Verify connector compatibility with your board or plan for a jumper wire.
Buy this when board clearance or wiring length is a concern. The cable saves extra work and keeps wiring organized in compact installations.
Cable Flexibility
1.2 meter cable allows remote sensor placement for better wiring management and safety.
Standard Connector
SM2.54 3P connector supports easy integration with common PCB headers and jumper wires.
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9. DIGITEN G3/8" Water Flow Sensor Hall Effect – Best Compact Flow Meter
DIGITEN G3/8" Water Flow Sensor Hall Effect
Flow range 0.3 to 10L per min
G3/8 inch thread connection
Working voltage DC 3.5 to 12 V
Square wave output pulse signal
This compact unit fits easily into tight spaces where larger sensors won't work. The G3/8 inch thread is perfect for small plumbing or tubing systems.
Pros
- Compact small size design
- G3/8 inch thread fits tight spots
- Low voltage 3.5V start
- Good 4.5 user rating
- Easy installation
Cons
- Lower voltage max of 12V
- Small flow range limit
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Operating from as low as 3.5 volts makes it compatible with battery powered setups. It covers 0.3 to 10 liters per minute for modest flow needs.
Waterproof and resistant to heat pressure and cold ensures durability. A good 4.5 rating supports consistent performance in varied conditions.
Choose this for portable devices or small fixtures with limited space. It balances size and function for constrained installation environments.
Space Saving Design
Compact size and G3/8 thread allow installation in restricted or tight pipe spaces.
Low Voltage Operation
Starts at 3.5 volts enabling battery or low voltage power sources.
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10. DIGITEN G3/4" Water Flow Sensor with Cable – Best Medium Flow Flow Meter
DIGITEN G3/4" Water Flow Sensor with Cable
Flow range 1 to 60L per min
1.2 meter cable length
G3/4 inch BSPT male thread
Water pressure up to 1.75 Mpa
This model supports a wider flow range up to 60 liters per minute for medium sized systems. The G3/4 inch thread connects to larger pipes than 1/2 inch options.
Pros
- 60 liter per minute flow range
- Includes 1.2 meter cable
- G3/4 inch thread size
- High pressure resistance
- Suitable for larger systems
Cons
- Lower 3.2 user rating
- Larger size and cost
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The included 1.2 meter cable aids in routing wires to accessible locations. Water pressure tolerance of 1.75 Mpa ensures stability in pressurized lines.
The 3.2 rating suggests mixed experiences so inspect carefully on arrival. It offers more capacity than budget units at a moderate price.
Use this for applications needing more flow than standard sensors handle. It provides a middle ground for medium capacity monitoring tasks.
Medium Flow Capacity
Handles up to 60 liters per minute for systems requiring moderate throughput rates.
Large Pipe Compatibility
G3/4 inch BSPT male thread fits larger diameter pipes for broader application.
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Buying Guide – How to Choose the Best Arduino Flow Meter
Selecting the right flow meter depends on your specific flow requirements, pipe size, and power constraints. This guide breaks down the key factors to consider.
Flow Range
Match the sensor flow range to your expected water flow. Too low and it saturates, too high and low flows go undetected. Review the minimum and maximum liters per minute carefully.
Choose a range that covers your typical flow with margin for peaks and avoid underspecifying.
Thread Size
Ensure the thread matches your plumbing connection. Common sizes include G1/2 G3/4 and G1.5. Use thread seal tape if adapting between types to prevent leaks.
Verify the thread standard NPT or BSPT before purchasing to avoid fit issues.
Working Voltage
Check that the sensor voltage matches your Arduino or controller supply. Many accept 5 to 12 volts but some go higher. Mismatched voltage can damage the sensor.
Confirm the range and ensure your power source stays within limits for safe operation.
Water Pressure Rating
High pressure systems need sensors rated for the pressure. Standard models may handle up to 1.75 Mpa. Exceeding this can crack the valve or affect accuracy.
Select a pressure rating above your system max to prevent mechanical failure.
Material Safety
For potable water use verify the sensor is food grade and ROHS compliant. Non rated materials may leach into water or fail inspections. This is critical for drinking or cooking.
Choose certified materials if the water is for consumption or food prep.
Output Signal
Hall effect sensors produce square wave pulses that Arduino reads easily. Check signal amplitude and noise tolerance. Higher voltage often improves noise immunity in long wires.
Ensure the pulse frequency and amplitude match your interrupt or counter input.
Cable Length
If wiring long distances check if the unit includes an extension or integrated cable. Short cables may force tight bundling or extra connectors. A 1.2 meter cable helps organize wiring.
Plan for cable length to keep electronics away from water and pipes.
How to Use and Care for Your Arduino Flow Meter
Install the sensor with correct flow direction. Arrow markings show the proper orientation. Reversing it blocks the signal and gives zero flow reading.
Secure all pipe connections with thread seal tape to prevent leaks. Ensure the sensor is supported so weight does not stress the valve body.
Clean the rotor occasionally if sediment is present. Rinse with clean water and check for debris before reusing to maintain accuracy.
Frequently Asked Questions
Do Arduino flow meters work with water?
Yes they are designed for water flow measurement. Ensure the model is potable water rated if used with drinking water.
What is the output signal?
They provide square wave pulses. Each pulse equals a fixed volume of flow. Count pulses to calculate total liters.
How do I connect it to Arduino?
Connect VCC to 5V and GND to ground. Signal goes to a digital interrupt pin. Use interrupts to count pulses accurately.
Can I use it with non potable water?
Check materials first. ROHS and food grade certifications indicate safety. For wastewater ensure compatibility to avoid degradation.
Do they require external power?
They need a DC power source matching their voltage rating. Common power comes from Arduino 5V or an external adapter.
What if pulses are inconsistent?
Check flow direction and wiring. Ensure clean power and low noise on signal lines. Reinstall if debris affects the rotor.
Final Thoughts on Choosing the Best Arduino Flow Meter
The DIGITEN G1.5 model leads for high flow projects while the Food Grade Switch is ideal for budget needs. The DEVMO Premium option stands out for electrical robustness.
Prioritize thread size and pressure rating to match your plumbing. Ensure food grade materials if used with drinking water.
Always check current stock and terms before ordering. Prices and availability vary so confirm details on the product page.