Adafruit
Geared DC Motor with Magnetic Encoder Outputs - 7 VDC 1:20 Ratio
This geared DC motor comes with a built-in magnetic encoder — a magnetic wheel and two Hall effect sensors are already attached to the motor body, giving you...
This geared DC motor comes with a built-in magnetic encoder — a magnetic wheel and two Hall effect sensors are already attached to the motor body, giving you quadrature feedback for both speed and direction without any extra wiring or mounting. It's the ideal starting point for closed-loop motor control in robotics projects.
Drive it at 7VDC via your motor driver, use PWM for speed and an H-bridge for direction control, and read encoder feedback directly into your microcontroller's interrupt pins to track RPM and rotation direction.
Specifications
- Supply Voltage – 7VDC nominal (motor)
- Gear Ratio – 1:20
- Encoder Type – Magnetic (quadrature), 2× Hall effect sensors
- Encoder Resolution – 12 counts per motor revolution
- Encoder Supply – 3–5VDC
Wiring
- Brown + Yellow – Motor leads (connect to motor driver; PWM-able)
- Black – Encoder GND (connect to microcontroller ground)
- Red – Encoder power (3–5VDC)
- White + Green – Hall effect encoder outputs (connect to interrupt pins)
Ideal For
- Robotics projects requiring closed-loop speed and direction control
- Wheel odometry for differential drive robots
- Arduino and microcontroller motor control experiments
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- encoder
- A device attached to a motor or shaft that reports movement, such as rotation steps or position. In a pump system, an encoder can help measure or control how much the motor has turned, which affects how repeatable the watering amount can be.
- 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.
- motor driver
- An electronic circuit that lets a low-power controller switch and control a motor that needs more current than the controller pins can safely provide. Checking motor driver support matters because pumps and motors usually cannot be connected directly to a microcontroller output.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
Find this product in
Brands
Robotics & Motion
Related Tutorials
Free guides on learn.littlebird.com.au
