The pressure sensor is an analog input module, it is a touch-activated sensor. The pressure sensor controls your circuit by how much pressure you put on it.
The main part of the pressure sensor module is a strain gauge pressure sensor, it’s basically a variable resistor whose resistance changes with the value of pressure it detects. The interface of the pressure sensor is an analog interface, it can read the analog value of the pressure you put on it, the range of analog value is from 0 to 1023.
1. The harder you press the round pad of the pressure sensor, the more signal it lets pass the whole circuit, the more obvious its effects on the output module.
There are multiple use cases for a pressure sensor, maybe you can make a pressure button that can work just by pressing by your finger.