Hall Effect Sensor Board & Adapter Installation

This page provides information on how to assemble the Hall Effect Sensor Board and mount it to your motor using the Hall Effect Sensor Adapter. Parts of this guide can be used selectively depending on how relevant it is to your application.

Tools needed:

  • Soldering iron with fine tip (1.5mm or less conical tip is recommended), solder

Parts needed:

  • Hall Effect Sensor Board
  • 3x ATS177 digital bipolar Hall Effect latches
  • Your own 5 conductor wire/cable
  • Hall Effect Sensor Adapter
  • #4 x 1/4″ screws and nylon washers

Board Assembly

sensboard_asm1The board kit contains 4 Hall sensors and the PCB itself. Make sure these parts are all present. You will only need 3 of the sensors; the fourth is a spare in case one is damaged in assembly.

The pins are labeled “G 5 C B A” left-to-right for Ground (0v), 5v power, and the 3 motor phase signals.




Remove the Hall sensors from the tape (if applicable) and place one in the thru-hole of your choice. The sensors have a chamfered (angled) side, which must all point inwards. The angled face is also the one with the part number engraving.




Turn the board upside-down. Using a fine-tipped soldering iron, carefully solder the 3 through-holes on the sensor, from the bottom side. The pressure of the iron will help keep the sensors flat and seated on the board. You may find it helpful to bend the sensor pins outwards to gain more space for the solder iron.



Solder the rest of the sensors one at a time. Make absolutely sure the sensors are seated flush against the board. For example, the leftmost sensor is completely unacceptable; the center one could use some re-melting with pressure.

If the sensors are not well-seated, they will cause errors in when they trigger in response to the motor’s magnetic field and can affect the smoothness significantly. By soldering the sensors in one at a time, upside down, the chance for misalignment is minimized.



After all 3 sensors are soldered, trim off the bottom side wire leads with flush cutters.






Finally, prepare your sensor wiring harness. Use a highly flexible wire to minimize stress on the solder pads. Solid-core breadboard wire is not recommended because it can fatigue over time. A good signal wire gauge is 24 to 26 gauge.


Adapter Installation



Grab the adapter ring that matches your sensor board and make sure you have the two #4 screws and washers.





Slip the adapter ring around the wires of the motor first. They have a hollow cutout to pass the wire bundle. Continue sliding the adapter ring around the conical face of the motor.





Attach the mounting plate of the motor next with your choice of screwdriver. Tighten the screws fully. The mounts are designed very slightly under-size on purpose such that they are securely locked against the motor’s conical face when mounted against a flat surface.




Finally, secure the Hall Effect Sensor Board. Begin by screwing in the provided #4 screws once. This cuts a thread into the holes on the adapter so you can more easily insert the screw while aligning the sensor board.

Next, remove one screw and slide the sensor board on through the matching slot. Align the other slot with its mounting hole and insert the screw. Tighten the two screws enough that the board can still slide with some pressure. You will need to fine-tune the position of the sensor board when finding the “sensor combination” that will run your motor.

To begin, align one sensor with the exact center of one slot on the stator laminations – the exact one is up to you.

See the Motor “Combo Finding” Heuristic Guide for one example procedure of how to match your sensor arrangement with your motor phases and controller outputs.

Initial Testing & Troubleshooting

If one or more sensors are damaged or otherwise nonfunctional, then no amount of combo-finding will make your motor work! There is an easy way to test for sensor functionality when the board is mounted to the motor.

Connect +5v and GND to the sensor board such that the sensors are powered. Using a multimeter on Ohms or continuity test mode, check for conduction between GND and a Hall sensor signal.

Because the sensors used are open collector latch sensors, “on” is indicated by a connection between GND and the sensor output, and “off” is indicated by an open circuit. Rotate the motor slightly and make sure the measured resistance is either nearly 0 (conduction, “on”) or many megohms (non-conduction, “off”). Repeat for all three sensors.

If the observed value does not change, the sensor could be damaged. Replace the sensor using desoldering braid or a desoldering iron, then reinstalling the spare sensor. Ensure all 3 sensors toggle states with motor rotation before continuing onto combo-finding.