This module is an incremental rotary encoder. It encodes the rotation signal from the axis and output the signal by electronic pulse. The Grove – Encoder is one of the Grove series and has a standard Grove interface.
If your project requires a rotary knob, (such as a volume knob for a speaker, a selection panel or even a digital input) this product should be your first choice.
It is able to generate another signal when it’s being pressed down. However due to the limitation of the number of Grove signal cable, the module is made without output of this signal.