You can find the product sheets HERE 

 The uStepper library has examples, showing the core functions. For a full description of all the software features visit our uStepper S documentation page or uStepper S-lite documentation page 

This is most likely because the default parameters in the uStepper library does not fit your application. Here’s a short description on what you could do to tune the parameters:

The first two parameters tells that we are doing Drop-in and that microstepping is 1/16 from the printer/cnc controller. The third parameter is the amount of steps that must have been missed for the PID to kick in. The third is the number of steps that you are still of before the control stops again. It is advisable to have some hysteresis to avoid oscillating behavior. You can move it to for example 5,0 or 10,0 depending on your mechanical setup and the following PID parameters. The next parameter is P, start with setting this to e.g. 1-5, the next is I, start with a value of maximum 2. The last is D, this you can set to 0 as a start. For info on what P, I and D do, please read on the very nice PID wiki page 

Another reason could be that the encoder magnet is slipping – especially when shifting direction. This can be fixed by using double adhesive tape to make the magnet sit tighter to the shaft.

Watch this video

Watch the video here and read the Readme on our GitHub

 Three most common issues:

1. If you use the Windows store app “Arduino IDE” you might experience problems. Download the executable or portable version of Arduino IDE from www.arduino.cc
2. Install hardware support and the uStepper library like shown here
3. Remember to chose uStepper as the board you program to

If you happen to have an error in the Arduino IDE while programming and you have made sure the above points are not the issue or you suddenly see a programming error after programming uStepper multiple times you might be having a bootloader problem. In rare cases it can happen that the ATmega 328PB drops its bootloader – but there’s a cure ! Read here

 

Try to turn the motor connector (remember to power off uStepper first!). If that does not work, check that the encoder magnet is placed correctly on the motor shaft. Another reason could be that the encoder magnet is slipping – especially when shifting direction. This can be fixed by using double adhesive tape to make the magnet sit tighter to the shaft.