Adafruit
Liquid Flow Meter - Brass 1/2 Nominal Threaded
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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...
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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.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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