Adafruit
Liquid Flow Meter - Brass 1/2 Nominal Threaded
This brass liquid flow meter measures water or other liquid flow using a pinwheel and Hall effect sensor. As liquid passes through the 1/2" threaded brass bo...
This brass liquid flow meter measures water or other liquid flow using a pinwheel and Hall effect sensor. As liquid passes through the 1/2" threaded brass body, it spins an internal pinwheel with a magnet attached. A Hall effect sensor on the outside of the tube counts the rotations through the metal wall, keeping the electronics safe and dry.
Each pulse from the sensor corresponds to approximately 2 mL of liquid. Connect the three-wire output (red = 5–18V power, black = ground, yellow = pulse output) to a microcontroller and count pulses to track flow. Comes with a 3-pin JST SM connector for easy wiring.
Key Features
- Hall Effect Pulse Output – ~2 mL per pulse for simple flow measurement
- Brass 1/2" Threaded Body – Durable construction for inline plumbing installation
- Safe, Dry Electronics – Magnetic sensing through the brass wall, no contact with liquid
- Wide Voltage Range – 5–18V DC power input
- 3-Pin JST SM Connector – Quick connect/disconnect wiring
Ideal For
- Garden irrigation and watering systems
- Solar thermal and water heating monitors
- Computer liquid cooling flow monitoring
- Aquarium and hydroponic flow tracking
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
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Sensors & Input
Related Tutorials
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