Help - Pololu magnetic encoders, low voltage output

I have been trying to use the Pololu magnetic encoders for the metal micromotors.

The problem I am having is that the outputs of “A” and “B” are around 750 mV, rather than the 5V it should be. I am powering the encoder board with 5V, and have checked the power and ground connections. I have four different motors and each is behaving this way.

Any help figuring out what’s wrong is greatly appreciated.


I believe it is an impedance problem with the PCI card I am using to read the signals. Removing this cable the outputs are 5V as expected. I will be getting differential line drivers to fix this problem. Thank you anyway.


Thanks for the update. I am glad to hear your troubles have been resolved.

- Nathan