Magnetic Encoder Pair Kit for 20D mm Metal Gearmotors, 20 CPR, 2.7-18V

Magnetic Encoder Pair Kit for 20D mm Metal Gearmotors, 20 CPR, 2.7-18V


Add quadrature encoders to your 20D mm metal gearmotors (extended back shaft version required) with this kit that uses a magnetic disc and Hall effect sensors to provide 20 counts per revolution of the motor shaft. The sensors operate from 2.7 V to 18 V and provide digital outputs that can be connected directly to a microcontroller or other digital circuit. This module is compatible with all of the dual-shaft 20D mm metal gearmotors we carry.

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This kit includes two dual-channel Hall effect sensor boards and two 10-pole magnetic discs that can be used to add quadrature encoding to two 20D mm metal gearmotors with extended back shafts (motors are not included with this kit). The encoder board senses the rotation of the magnetic disc and provides a resolution of 20 counts per revolution of the motor shaft when counting both edges of both channels. To compute the counts per revolution of the gearbox output shaft, multiply the gear ratio by 20. (We also have a 6-pole magnetic disc available separately that can work with this encoder to provide 12 counts per revolution of the motor shaft.)

This compact encoder solution fits within the 20 mm diameter cross section of the rear of the motors on three of the four sides. The fourth side of the encoder has the signal and power connections, and it extends 3 mm past flat edge of the motor. The assembly does not extend past the end of the extended motor shaft, which protrudes 6 mm beyond the back of the motor.

Note: This sensor system is intended for users comfortable with the physical encoder installation. It only works with 20D mm meta gearmotors that have extended motor shafts.


Size: 20 mm × 16.5 mm
Weight: 2.4 g

General specifications:

Minimum operating voltage: 2.7 V
Maximum operating voltage: 18 V
Encoder resolution: 20 CPR

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