LCD-ALPHABET (Learn how to encode characters in Arduino using ASCII code)
Do you know what ASCII code is? It is a standardized way of encoding alphanumeric characters in a form of bytes and bits. Now you can learn it and create an encrypted message to be displayed into the LCD screen.
THERMOMETER-LCD (Use the temperature sensor to make a digital Thermometer)
Do you know how to create a thermometer to measure your body temperature? After trying out, you definitely will! Try it out and measure the temperature of your surroundings and create a warning system!