Introduction to Microcontrollers - Videos Supporting Lesson 6

These videos give an idea of what is expected in some of the Lesson 6 projects

They  were made using a Basic Stamp, but the principle is the same for Arduino

Photocell with adjustable sensitivity (photocell-potentiometer comparator)

Automatic toilet Problem

NSA spy toilet - counts the number of times you flush and stores it in EEPROM