Magnetic Encoder Pair Kit with Side-Entry Connector for Micro Metal Gearmotors, 12 CPR, 2.7-18V

SKU: POLOLU-4761 Brand: Pololu
Add quadrature encoders to your micro metal gearmotors (extended back shaft version required) with this kit that uses a magnetic disc and hall effect sensors to provide 12 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
$13.45 AUD, inc GST
$12.23 AUD, exc GST

In stock, ships same business day if ordered before 2PM
Delivered by Wed, 17th of Apr

Quantity Discounts:

  • 10-25 $11.86 (exc GST)
  • 25+ $11.62 (exc GST)
- +

3 from local stock, 1 supplier stock; your order will dispatch between Dec 1 to Dec 10. And yes, stock levels and lead times are accurate!

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  • $10+ Express (2+ days*, tracked)
  • FREE Pickup (Newcastle only - must order online*)

Shipping costs may increase for heavy products or large orders.

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*Conditions apply, see shipping tab below.

This kit includes two dual-channel Hall effect sensor boards and two 6-pole magnetic discs that can be used to add quadrature encoding to two micro metal gearmotors with extended back shafts (motors and cables are not included with this kit). The encoder board senses the rotation of the magnetic disc and provides a resolution of 12 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 12. This compact encoder solution fits within the 12 mm × 10 mm cross section of the motors on three of the four sides, and it extends 4.2 mm past the edge of the fourth side.

The encoders include a side-entry, 6-pin male JST SH-type connector. Pololu also carry a version of this encoder with a top-entry connector; the following pictures show comparisons of the top-entry and side-entry versions:

Magnetic Encoders with Top-Entry Connector (left) and Side-Entry Connector (right) assembled on Micro Metal Gearmotors with Extended Motor Shafts (JST cables not included).

Magnetic Encoder with Top-Entry Connector (top) and Side-Entry Connector (bottom) assembled Micro Metal Gearmotors with Extended Motor Shafts (JST cables not included).

Note: This sensor system is intended for users comfortable with the physical encoder installation. It only works with micro metal gearmotors that have extended back shafts.

Cable options

Pololu have two types of cables with matching JST SH-style connectors that can be used with these encoders.

Single-ended cables, with a connector on one end and unterminated wires on the other end, are available in three lengths:

Twisted female-female cables with connectors on both ends are available in five lengths:

These double-ended cables can be used with Pololu's JST SH-style connector breakout boards (available in top-entry and side-entry versions) to easily access the motor and encoder pins on a standard solderless breadboard.

Pinout and installation

The encoder board is designed to be soldered directly to the back of the motor, with the back shaft of the motor protruding through the hole in the middle of the circuit board. One way to achieve good alignment between the board and the motor is to tack down the board to one motor pin and to solder the other pin only when the board is flat and well aligned. Be careful to avoid prolonged heating of the motor pins, which could deform the plastic end cap of the motor or the motor brushes. Once the board is soldered down to the two terminals, the motor leads are connected to the M1 and M2 connector pins as labeled below, and they can be accessed via the red and black wires when used with Pololu's corresponding JST cables. The remaining four connector pins are used to power the sensors and access the two quadrature outputs:

The sensors are powered through the VCC (blue wire) and GND (green wire) pins. VCC can be 2.7 V to 18 V, and the quadrature outputs A and B (yellow and white wires) are digital signals that are either driven low (0 V) by the sensors or pulled to VCC through 10 kO pull-up resistors, depending on the applied magnetic field. The sensors’ comparators have built-in hysteresis, which prevents spurious signals in cases where the motor stops near a transition point.

Encoder A and B outputs of a magnetic encoder on a high-power (HP) micro metal gearmotor running at 6 V.

Schematic diagram

This schematic is also available as a downloadable pdf (80k pdf).

Comparison to previous version

This encoder version is a modification of the previous version that adds a connector to enable the use of removable cables. The basic schematic is unchanged, and the electrical performance is identical. The following picture shows the two new encoders with JST SH-type connectors next to the previous (green) one:

Side-by-side comparison of Magnetic Encoder with Top-Entry Connector (left), Side-Entry Connector (center), and 2mm-pitch through-holes (right).

People often buy this product together with:

Pololu Micro Metal Gearmotor Bracket Pair - BlackPololu Micro Metal Gearmotor Bracket Pair - Black
Magnetic Encoder Pair Kit with Top-Entry Connector for Micro Metal Gearmotors, 12 CPR, 2.7-18VMagnetic Encoder Pair Kit with Top-Entry Connector for Micro Metal Gearmotors, 12 CPR, 2.7-18V
6-Pin Single-Ended Female JST SH-Style Cable 12cm6-Pin Single-Ended Female JST SH-Style Cable 12cm

Dimensions

Size: 14.2 mm × 11.6 mm1
Weight: 1.5 g2

General specifications

Minimum operating voltage: 2.7 V
Maximum operating voltage: 18 V
Connector: side-entry, 6-pin male, JST SH-type

Identifying markings

PCB dev codes: enc03d
Other PCB markings: 0J12461

Notes:

1
The assembled encoder will extend approximately 5 mm beyond the plastic motor end cap.
2
Weight of full set. Each encoder board weighs ~0.4 g and each magnet disc weighs ~0.3 g.

File downloads

Recommended links

Product Comments

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Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).

We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):

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If you order lots of gear, the postage amount will increase based on the weight of your order.

Our physical address (here's a PDF which includes other key business details):

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.

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