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...
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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.
- 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.
- encoder
- An encoder is a sensor that converts the rotation or position of a shaft, knob or dial into electrical signals, reporting movement as incremental steps and direction, or as an absolute position. It is used to track how far something has turned, which matters for precise positioning, speed control, repeatable movement, or using a rotary knob as an input.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- 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.
- 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
