0:00 – 0:55
This part of the video demonstrates parts 1 and 2 of the assignment. The pushbutton switch acts as the counter and the reset button is activated by pouring water into the bowl. The switch takes advantage of the electrical conductivity of water.
0:55 – 1:25
This part demonstrates parts 3 and 4 of the assignment. The LEDs count to 3 using different combinations of the switches.