3531_0 Optical Rotary Encoder HKT22

£34.68 £28.90

This low-cost encoder is designed to fit on the rear shaft of our stepper motors. Measure the rotation of your motor even when it stalls or missteps.


  • 0.9 mm Hex Key for set-screws
  • Plastic encoder cap and mount
  • Encoder disk
  • Encoder PCB
  • Two screws
  • 3035 - Cable for HKT22 Encoder

This compact, economical optical quadrature encoder can be attached to the 4mm rear shaft of a motor. It has 300 counts (full quadrature cycles) per rotation and can be installed by fitting it over the shaft, mounting it to the back of the motor, and tightening the set-screw. This encoder does not support the use of an index channel.


The mounting holes on the HKT22 encoder line up with the holes on the back of any rear-shaft stepper motor from Phidgets, Inc. It connects to any of the following interface boards via the included cable:

Encoder Properties

Output Circuit TypePush-Pull (Single-Ended)
Encoder Resolution300 CPR


Electrical Properties

Supply Voltage Min5 V DC
Supply Voltage Max5 V DC
Output Frequency Max30 kHz


Physical Properties

Shaft Diameter4 mm
Operating Humidity Min30 %RH
Operating Humidity Max(Non-condensing) 85 %RH
Operating Temperature Min-10 °C
Operating Temperature Max85 °C
IP RatingIP40
Weight4 g