To begin with, I want to introduce this flex pressure sensor. DFRobot is launching 7 new flex sensors with different sensing areas, covering three kinds of shape: circle, square, and long strip. These flex sensors feature great flexibility and easy to use, peel off the protection cover and stick the sensor on the surface you want to detect, then it works.
Step 3: cover the naked wires with Electrical Tape:
Step 4: burn the programs into beetle controller;
Here is the smart cup mat, give it a try if you like it!