“The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality of the Arduino Duemilanove, but in a different package. This is a project which is based on the Arduino Nano and it’s interfacing with other sensors. In this Instructable, I’ll show you how to make a Water Level Indicator that measures the level of water in the tank and Displays it on an LCD screen. So in this project I’ll be using the HC-SR04 Ultrasonic Module to measure the Water Level and an I2C LCD to see the water level in cm.”