Hall Sensor Tester

[Who42]

  Hall Sensor Tester
Electrobent first posted this circuit but I modded it a little to make it a bit more useful
  This is a very handy gadget to build and it works very well once finished it will save you lots of time sorting out if hall sensors have faild it will even tell if just one or two have failed and which ones
  This should work with any BLDC motor

[Leslie]

This is a handy circuit indeed.

There should be a way use the 5v supply to the halls and ditch the 470ohm resistor and 9v battery.

No lights means power failure.

The hall sensors are often regulated by a LM7805  which can handle 1 amp.  

The halls require 20ma and each led might cost you 40ma when two are on.

Pretty sure the circuit can handle 60ma with no drop.

[Who42]

The 470ohm resistor and 9v battery combo = 5v was used because it limits the current some what and safer than using 4 AA batteries which would give 6v or 3 AA batteries at 4.5v and capable of to much current

Another type of Hub Motor see pic
BOTTOM pic of faulty Hall sensor C was rubbing against magnets making the wheel feel bumpy as I turned it over when I first got it , Hall sensor A had bad solder joints , Hall sensor B was the only one working properly

[Leslie]

The 470ohm resistor and 9v battery combo = 5v was used because it limits the current some what and safer than using 4 AA batteries which would give 6v or 3 AA batteries at 4.5v and capable of to much current

Another type of Hub Motor see pic
BOTTOM pic of faulty Hall sensor C was rubbing against magnets making the wheel feel bumpy as I turned it over when I first got it , Hall sensor A had bad solder joints , Hall sensor B was the only one working properly

Yes the GM hubs use an S41 from memory which is like the Chinese version SS41 by Honeywell.

The SS41 has a voltage limit of 24v not sure about the S41 though.  

The idea behind the using pack power to run this circuit is you can have the pretty flashing lights all the time and not have to replace a 9v battery.

They are funny little suckers.  One minute they go without warning and then they hold up from repeated direct friction from motors.

[TRK]

Great idea to have leds connected all the time.