Moving-message displays are ideal to get your message (advertisements, greetings, etc) across in an eye-catching way. You can make an LCD show a brief moving message by interfacing it to a microcontroller.
Here’s an AVR-based moving-message display that uses a 16×2 LCD display incorporating HD44780. The 16×2 LCD can display 16 characters per line and there are two such lines.
Fig. 1 shows the circuit for AVR ATmega16-based moving-message display on an LCD. It consists of an ATmega16 microcontroller, a 16×2 LCD, an SPI6 connector and a power supply section.