this is a simple project to fix a 12v water dispenser
Item list:
1x Arduino Uno;
3x 12v Solvenoid Valve;
3x NPN Transistor (in my experiment i use TIP120);
3x 1N400x Diode (in my experiment i use 1N4001);
6x 1K Ohm Resistance;
1x Membrane button array;
